net: Define # of cpus for network processing.

[dragonfly.git] / share / zoneinfo / northamerica

# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.

# also includes Central America and the Caribbean

# This file is by no means authoritative; if you think you know better,
# go ahead and edit the file (and please send any changes to
# tz@iana.org for general use in the future).  For more, please see
# the file CONTRIBUTING in the tz distribution.

# From Paul Eggert (1999-03-22):
# A reliable and entertaining source about time zones is
# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).

###############################################################################

# United States

# From Paul Eggert (1999-03-31):
# Howse writes (pp 121-125) that time zones were invented by
# Professor Charles Ferdinand Dowd (1825-1904),
# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
# His pamphlet "A System of National Time for Railroads" (1870)
# was the result of his proposals at the Convention of Railroad Trunk Lines
# in New York City (1869-10).  His 1870 proposal was based on Washington, DC,
# but in 1872-05 he moved the proposed origin to Greenwich.

# From Paul Eggert (2016-09-21):
# Dowd's proposal left many details unresolved, such as where to draw
# lines between time zones.  The key individual who made time zones
# work in the US was William Frederick Allen - railway engineer,
# managing editor of the Travelers' Guide, and secretary of the
# General Time Convention, a railway standardization group.  Allen
# spent months in dialogs with scientific and railway leaders,
# developed a workable plan to institute time zones, and presented it
# to the General Time Convention on 1883-04-11, saying that his plan
# meant "local time would be practically abolished" - a plus for
# railway scheduling.  By the next convention on 1883-10-11 nearly all
# railroads had agreed and it took effect on 1883-11-18 at 12:00.
# That Sunday was called the "day of two noons", as the eastern parts
# of the new zones observed noon twice.  Allen witnessed the
# transition in New York City, writing:
#
#   I heard the bells of St. Paul's strike on the old time.  Four
#   minutes later, obedient to the electrical signal from the Naval
#   Observatory ... the time-ball made its rapid descent, the chimes
#   of old Trinity rang twelve measured strokes, and local time was
#   abandoned, probably forever.
#
# Most of the US soon followed suit.  See:
# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
# http://dx.doi.org/10.2307/3105430

# From Paul Eggert (2005-04-16):
# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).

# From Paul Eggert (2006-03-22):
# A good source for time zone historical data in the US is
# Thomas G. Shanks, The American Atlas (5th edition),
# San Diego: ACS Publications, Inc. (1991).
# Make sure you have the errata sheet; the book is somewhat useless without it.
# It is the source for most of the pre-1991 US entries below.

# From Paul Eggert (2001-03-06):
# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
# in his whimsical essay "An Economical Project for Diminishing the Cost
# of Light" published in the Journal de Paris (1784-04-26).
# Not everyone is happy with the results:
#
#       I don't really care how time is reckoned so long as there is some
#       agreement about it, but I object to being told that I am saving
#       daylight when my reason tells me that I am doing nothing of the kind.
#       I even object to the implication that I am wasting something
#       valuable if I stay in bed after the sun has risen.  As an admirer
#       of moonlight I resent the bossy insistence of those who want to
#       reduce my time for enjoying it.  At the back of the Daylight Saving
#       scheme I detect the bony, blue-fingered hand of Puritanism, eager
#       to push people into bed earlier, and get them up earlier, to make
#       them healthy, wealthy and wise in spite of themselves.
#
#        -- Robertson Davies, The diary of Samuel Marchbanks,
#          Clarke, Irwin (1947), XIX, Sunday
#
# For more about the first ten years of DST in the United States, see
# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint
# (Carnegie Library of Pittsburgh, 1927).
# http://www.clpgh.org/exhibit/dst.html
#
# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
# However, DST was imposed by the Standard Time Act of 1918, which
# was the first nationwide legal time standard, and apparently
# time was just called "Standard Time" or "Daylight Saving Time".

# From Arthur David Olson:
# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
# See, for example, the front page of the Saturday, 1974-10-26
# and Sunday, 1974-10-27 editions of the Washington Post.

# From Arthur David Olson:
# Before the Uniform Time Act of 1966 took effect in 1967, observance of
# Daylight Saving Time in the US was by local option, except during wartime.

# From Arthur David Olson (2000-09-25):
# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
# In the introduction, Oboler spoke of "Eastern Peace Time."
# An AltaVista search turned up:
# http://rowayton.org/rhs/hstaug45.html
# "When the time is announced over the radio now, it is 'Eastern Peace
# Time' instead of the old familiar 'Eastern War Time.'  Peace is wonderful."
# (August 1945) by way of confirmation.

# From Joseph Gallant citing
# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
# to switch to London for Attlee's address, but the American people
# never got to hear his speech live. According to one press account,
# CBS' Bob Trout was first to announce the word of Japan's surrender,
# but a few seconds later, NBC, ABC and Mutual also flashed the word
# of surrender, all of whom interrupting the bells of Big Ben in
# London which were to precede Mr. Attlee's speech.

# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout.  From
# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
#
# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
# Any announcement from Asia would reach St. John's New York newsroom on a
# wire service teletype machine, which had prescribed signals for major news.
# Associated Press, for example, would ring five bells before spewing out
# typed copy of an important story, and 10 bells for news "of transcendental
# importance."
#
# On Aug. 14, stalling while talking steadily into the NBC networks' open
# microphone, St. John heard five bells and waited only to hear a sixth bell,
# before announcing confidently: "Ladies and gentlemen, World War II is over.
# The Japanese have agreed to our surrender terms."
#
# He had scored a 20-second scoop on other broadcasters.

# From Arthur David Olson (2005-08-22):
# Paul has been careful to use the "US" rules only in those locations
# that are part of the United States; this reflects the real scope of
# U.S. government action.  So even though the "US" rules have changed
# in the latest release, other countries won't be affected.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    US      1918    1919    -       Mar     lastSun 2:00    1:00    D
Rule    US      1918    1919    -       Oct     lastSun 2:00    0       S
Rule    US      1942    only    -       Feb     9       2:00    1:00    W # War
Rule    US      1945    only    -       Aug     14      23:00u  1:00    P # Peace
Rule    US      1945    only    -       Sep     lastSun 2:00    0       S
Rule    US      1967    2006    -       Oct     lastSun 2:00    0       S
Rule    US      1967    1973    -       Apr     lastSun 2:00    1:00    D
Rule    US      1974    only    -       Jan     6       2:00    1:00    D
Rule    US      1975    only    -       Feb     23      2:00    1:00    D
Rule    US      1976    1986    -       Apr     lastSun 2:00    1:00    D
Rule    US      1987    2006    -       Apr     Sun>=1  2:00    1:00    D
Rule    US      2007    max     -       Mar     Sun>=8  2:00    1:00    D
Rule    US      2007    max     -       Nov     Sun>=1  2:00    0       S

# From Arthur David Olson, 2005-12-19
# We generate the files specified below to guard against old files with
# obsolete information being left in the time zone binary directory.
# We limit the list to names that have appeared in previous versions of
# this time zone package.
# We do these as separate Zones rather than as Links to avoid problems if
# a particular place changes whether it observes DST.
# We put these specifications here in the northamerica file both to
# increase the chances that they'll actually get compiled and to
# avoid the need to duplicate the US rules in another file.

# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone    EST              -5:00  -       EST
Zone    MST              -7:00  -       MST
Zone    HST             -10:00  -       HST
Zone    EST5EDT          -5:00  US      E%sT
Zone    CST6CDT          -6:00  US      C%sT
Zone    MST7MDT          -7:00  US      M%sT
Zone    PST8PDT          -8:00  US      P%sT

# From U. S. Naval Observatory (1989-01-19):
# USA  EASTERN       5 H  BEHIND UTC    NEW YORK, WASHINGTON
# USA  EASTERN       4 H  BEHIND UTC    APR 3 - OCT 30
# USA  CENTRAL       6 H  BEHIND UTC    CHICAGO, HOUSTON
# USA  CENTRAL       5 H  BEHIND UTC    APR 3 - OCT 30
# USA  MOUNTAIN      7 H  BEHIND UTC    DENVER
# USA  MOUNTAIN      6 H  BEHIND UTC    APR 3 - OCT 30
# USA  PACIFIC       8 H  BEHIND UTC    L.A., SAN FRANCISCO
# USA  PACIFIC       7 H  BEHIND UTC    APR 3 - OCT 30
# USA  ALASKA STD    9 H  BEHIND UTC    MOST OF ALASKA     (AKST)
# USA  ALASKA STD    8 H  BEHIND UTC    APR 3 - OCT 30 (AKDT)
# USA  ALEUTIAN     10 H  BEHIND UTC    ISLANDS WEST OF 170W
# USA    "           9 H  BEHIND UTC    APR 3 - OCT 30
# USA  HAWAII       10 H  BEHIND UTC
# USA  BERING       11 H  BEHIND UTC    SAMOA, MIDWAY

# From Arthur David Olson (1989-01-21):
# The above dates are for 1988.
# Note the "AKST" and "AKDT" abbreviations, the claim that there's
# no DST in Samoa, and the claim that there is DST in Alaska and the
# Aleutians.

# From Arthur David Olson (1988-02-13):
# Legal standard time zone names, from United States Code (1982 Edition and
# Supplement III), Title 15, Chapter 6, Section 260 and forward.  First, names
# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
# took effect), as explained in sections 263 and 261:
#       (none)
#       United States standard eastern time
#       United States standard mountain time
#       United States standard central time
#       United States standard Pacific time
#       (none)
#       United States standard Alaska time
#       (none)
# Next, names from 1967-04-01 until 1983-11-30 (the date for
# public law 98-181):
#       Atlantic standard time
#       eastern standard time
#       central standard time
#       mountain standard time
#       Pacific standard time
#       Yukon standard time
#       Alaska-Hawaii standard time
#       Bering standard time
# And after 1983-11-30:
#       Atlantic standard time
#       eastern standard time
#       central standard time
#       mountain standard time
#       Pacific standard time
#       Alaska standard time
#       Hawaii-Aleutian standard time
#       Samoa standard time
# The law doesn't give abbreviations.
#
# From Paul Eggert (2016-12-19):
# Here are URLs for the 1918 and 1966 legislation:
# http://uscode.house.gov/statviewer.htm?volume=40&page=451
# http://uscode.house.gov/statviewer.htm?volume=80&page=108
# Although the 1918 names were officially "United States Standard
# Eastern Time" and similarly for "Central", "Mountain", "Pacific",
# and "Alaska", in practice "Standard" was placed just before "Time",
# as codified in 1966.  In practice, Alaska time was abbreviated "AST"
# before 1968.  Summarizing the 1967 name changes:
#       1918 names                      1967 names
#  -08  Standard Pacific Time (PST)     Pacific standard time (PST)
#  -09  (unofficial) Yukon (YST)        Yukon standard time (YST)
#  -10  Standard Alaska Time (AST)      Alaska-Hawaii standard time (AHST)
#  -11  (unofficial) Nome (NST)         Bering standard time (BST)
#
# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
# Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time"
# for time in Guam and the Northern Marianas.  See the file "australasia".
#
# From Paul Eggert (2015-04-17):
# HST and HDT are standardized abbreviations for Hawaii-Aleutian
# standard and daylight times.  See section 9.47 (p 234) of the
# U.S. Government Printing Office Style Manual (2008)
# http://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf

# From Arthur David Olson, 2005-08-09
# The following was signed into law on 2005-08-08.
#
# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
#   (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
#   U.S.C. 260a(a)) is amended--
#     (1) by striking "first Sunday of April" and inserting "second
#     Sunday of March"; and
#     (2) by striking "last Sunday of October" and inserting "first
#     Sunday of November'.
#   (b) Effective Date.--Subsection (a) shall take effect 1 year after the
#   date of enactment of this Act or March 1, 2007, whichever is later.
#   (c) Report to Congress.--Not later than 9 months after the effective
#   date stated in subsection (b), the Secretary shall report to Congress
#   on the impact of this section on energy consumption in the United
#   States.
#   (d) Right to Revert.--Congress retains the right to revert the
#   Daylight Saving Time back to the 2005 time schedules once the
#   Department study is complete.

# US eastern time, represented by New York

# Connecticut, Delaware, District of Columbia, most of Florida,
# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
# New Hampshire, New Jersey, New York, North Carolina, Ohio,
# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
# Vermont, Virginia, West Virginia

# From Dave Cantor (2004-11-02):
# Early this summer I had the occasion to visit the Mount Washington
# Observatory weather station atop (of course!) Mount Washington [, NH]....
# One of the staff members said that the station was on Eastern Standard Time
# and didn't change their clocks for Daylight Saving ... so that their
# reports will always have times which are 5 hours behind UTC.

# From Paul Eggert (2005-08-26):
# According to today's Huntsville Times
# http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1
# a few towns on Alabama's "eastern border with Georgia, such as Phenix City
# in Russell County, Lanett in Chambers County and some towns in Lee County,
# set their watches and clocks on Eastern time."  It quotes H.H. "Bubba"
# Roberts, city administrator in Phenix City. as saying "We are in the Central
# time zone, but we do go by the Eastern time zone because so many people work
# in Columbus."
#
# From Paul Eggert (2017-02-22):
# Four cities are involved.  The two not mentioned above are Smiths Station
# and Valley.  Barbara Brooks, Valley's assistant treasurer, heard it started
# because West Point Pepperell textile mills were in Alabama while the
# corporate office was in Georgia, and residents voted to keep Eastern
# time even after the mills closed.  See: Kazek K. Did you know which
# Alabama towns are in a different time zone?  al.com 2017-02-06.
# http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html

# From Paul Eggert (2014-09-06):
# Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208
# says that New York City Hall time was 3 minutes 58.4 seconds fast of
# Eastern time (i.e., -4:56:01.6) just before the 1883 switch.  Round to the
# nearest second.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    NYC     1920    only    -       Mar     lastSun 2:00    1:00    D
Rule    NYC     1920    only    -       Oct     lastSun 2:00    0       S
Rule    NYC     1921    1966    -       Apr     lastSun 2:00    1:00    D
Rule    NYC     1921    1954    -       Sep     lastSun 2:00    0       S
Rule    NYC     1955    1966    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/New_York   -4:56:02 -      LMT     1883 Nov 18 12:03:58
                        -5:00   US      E%sT    1920
                        -5:00   NYC     E%sT    1942
                        -5:00   US      E%sT    1946
                        -5:00   NYC     E%sT    1967
                        -5:00   US      E%sT

# US central time, represented by Chicago

# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
# Washington counties), Illinois, western Indiana
# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
# western Tennessee, most of Texas, Wisconsin

# From Larry M. Smith (2006-04-26) re Wisconsin:
# http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
# is currently enforced at the 01:00 time of change.  Because the local
# "bar time" in the state corresponds to 02:00, a number of citations
# are issued for the "sale of class 'B' alcohol after prohibited
# hours" within the deviated hour of this change every year....
#
# From Douglas R. Bomberg (2007-03-12):
# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
# Statue 175 closer in synch with the US Congress' intent....
# http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf

# From an email administrator of the City of Fort Pierre, SD (2015-12-21):
# Fort Pierre is technically located in the Mountain time zone as is
# the rest of Stanley County.  Most of Stanley County and Fort Pierre
# uses the Central time zone due to doing most of their business in
# Pierre so it simplifies schedules.  I have lived in Stanley County
# all my life and it has been that way since I can remember.  (43 years!)
#
# From Paul Eggert (2015-12-25):
# Assume this practice predates 1970, so Fort Pierre can use America/Chicago.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    Chicago 1920    only    -       Jun     13      2:00    1:00    D
Rule    Chicago 1920    1921    -       Oct     lastSun 2:00    0       S
Rule    Chicago 1921    only    -       Mar     lastSun 2:00    1:00    D
Rule    Chicago 1922    1966    -       Apr     lastSun 2:00    1:00    D
Rule    Chicago 1922    1954    -       Sep     lastSun 2:00    0       S
Rule    Chicago 1955    1966    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Chicago    -5:50:36 -      LMT     1883 Nov 18 12:09:24
                        -6:00   US      C%sT    1920
                        -6:00   Chicago C%sT    1936 Mar  1  2:00
                        -5:00   -       EST     1936 Nov 15  2:00
                        -6:00   Chicago C%sT    1942
                        -6:00   US      C%sT    1946
                        -6:00   Chicago C%sT    1967
                        -6:00   US      C%sT
# Oliver County, ND switched from mountain to central time on 1992-10-25.
Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
                        -7:00   US      M%sT    1992 Oct 25  2:00
                        -6:00   US      C%sT
# Morton County, ND, switched from mountain to central time on
# 2003-10-26, except for the area around Mandan which was already central time.
# See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
# Officially this switch also included part of Sioux County, and
# Jones, Mellette, and Todd Counties in South Dakota;
# but in practice these other counties were already observing central time.
# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
Zone America/North_Dakota/New_Salem -6:45:39 - LMT      1883 Nov 18 12:14:21
                        -7:00   US      M%sT    2003 Oct 26  2:00
                        -6:00   US      C%sT

# From Josh Findley (2011-01-21):
# ...it appears that Mercer County, North Dakota, changed from the
# mountain time zone to the central time zone at the last transition from
# daylight-saving to standard time (on Nov. 7, 2010):
# http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html

# From Andy Lipscomb (2011-01-24):
# ...according to the Census Bureau, the largest city is Beulah (although
# it's commonly referred to as Beulah-Hazen, with Hazen being the next
# largest city in Mercer County).  Google Maps places Beulah's city hall
# at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
# of 6h47'07".

Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
                        -7:00   US      M%sT    2010 Nov  7  2:00
                        -6:00   US      C%sT

# US mountain time, represented by Denver
#
# Colorado, far western Kansas, Montana, western
# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
# New Mexico, southwestern North Dakota,
# western South Dakota, far western Texas (El Paso County, Hudspeth County,
# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
#
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    Denver  1920    1921    -       Mar     lastSun 2:00    1:00    D
Rule    Denver  1920    only    -       Oct     lastSun 2:00    0       S
Rule    Denver  1921    only    -       May     22      2:00    0       S
Rule    Denver  1965    1966    -       Apr     lastSun 2:00    1:00    D
Rule    Denver  1965    1966    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Denver     -6:59:56 -      LMT     1883 Nov 18 12:00:04
                        -7:00   US      M%sT    1920
                        -7:00   Denver  M%sT    1942
                        -7:00   US      M%sT    1946
                        -7:00   Denver  M%sT    1967
                        -7:00   US      M%sT

# US Pacific time, represented by Los Angeles
#
# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
# north of the Salmon River, and the towns of Burgdorf and Warren),
# Nevada (except West Wendover), Oregon (except the northern 3/4 of
# Malheur county), and Washington

# From Paul Eggert (2016-08-20):
# In early February 1948, in response to California's electricity shortage,
# PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
# causing electric clocks to lose six minutes per day.  (This did not change
# legal time, and is not part of the data here.)  See:
# Ross SA. An energy crisis from the past: Northern California in 1948.
# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
# 1973-11.  http://escholarship.org/uc/item/8x22k30c
#
# In another measure to save electricity, DST was instituted from 1948-03-14
# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
# the fallback transition earlier.  See pages 3-4 of:
# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
#
# In response:
#
#   Governor Warren received a torrent of objecting mail, and it is not too much
#   to speculate that the objections to Daylight Saving Time were one important
#   factor in the defeat of the Dewey-Warren Presidential ticket in California.
#     -- Ross, p 25
#
# On December 8 the governor exercised the option, setting the date to January 1
# (LA Times 1948-12-09).  The transition time was 02:00 (LA Times 1949-01-01).
#
# Despite the controversy, in 1949 California voters approved Proposition 12,
# which established DST from April's last Sunday at 01:00 until September's
# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed
# the fall-back date to October's last Sunday. See:
# http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props
# http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props
#
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    CA      1948    only    -       Mar     14      2:01    1:00    D
Rule    CA      1949    only    -       Jan      1      2:00    0       S
Rule    CA      1950    1966    -       Apr     lastSun 1:00    1:00    D
Rule    CA      1950    1961    -       Sep     lastSun 2:00    0       S
Rule    CA      1962    1966    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Los_Angeles -7:52:58 -     LMT     1883 Nov 18 12:07:02
                        -8:00   US      P%sT    1946
                        -8:00   CA      P%sT    1967
                        -8:00   US      P%sT

# Alaska
# AK%sT is the modern abbreviation for -09 per USNO.
#
# From Paul Eggert (2001-05-30):
# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
# also a Friday.  Include only the time zone part of this transition,
# ignoring the switch from Julian to Gregorian, since we can't represent
# the Julian calendar.
#
# As far as we know, none of the exact locations mentioned below were
# permanently inhabited in 1867 by anyone using either calendar.
# (Yakutat was colonized by the Russians in 1799, but the settlement
# was destroyed in 1805 by a Yakutat-kon war party.)  However, there
# were nearby inhabitants in some cases and for our purposes perhaps
# it's best to simply use the official transition.

# From Paul Eggert (2014-07-18):
# One opinion of the early-1980s turmoil in Alaska over time zones and
# daylight saving time appeared as graffiti on a Juneau airport wall:
# "Welcome to Juneau.  Please turn your watch back to the 19th century."
# See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01.
# http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html
#
# Steve Ferguson (2011-01-31) referred to the following source:
# Norris F. Keeping time in Alaska: national directives, local response.
# Alaska History 2001;16(1-2).
# http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/

# From Arthur David Olson (2011-02-01):
# Here's database-relevant material from the 2001 "Alaska History" article:
#
# On September 20 [1979]...DOT...officials decreed that on April 27,
# 1980, Juneau and other nearby communities would move to Yukon Time.
# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
# Pacific Time.
#
# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
# Department's September 1979 decision. Juneau and other communities in
# northern Southeast reverted to Pacific Time on October 26.
#
# On October 28 [1983]...the Metlakatla Indian Community Council voted
# unanimously to keep the reservation on Pacific Time.
#
# According to DOT official Joanne Petrie, Indian reservations are not
# bound to follow time zones imposed by neighboring jurisdictions.
#
# (The last is consistent with how the database now handles the Navajo
# Nation.)

# From Arthur David Olson (2011-02-09):
# I just spoke by phone with a staff member at the Metlakatla Indian
# Community office (using contact information available at
# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
# It's shortly after 1:00 here on the east coast of the United States;
# the staffer said it was shortly after 10:00 there. When I asked whether
# that meant they were on Pacific time, they said no - they were on their
# own time. I asked about daylight saving; they said it wasn't used. I
# did not inquire about practices in the past.

# From Arthur David Olson (2011-08-17):
# For lack of better information, assume that Metlakatla's
# abandonment of use of daylight saving resulted from the 1983 vote.

# From Steffen Thorsen (2015-11-09):
# It seems Metlakatla did go off PST on Sunday, November 1, changing
# their time to AKST and are going to follow Alaska's DST, switching
# between AKST and AKDT from now on....
# http://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/

# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Juneau      15:02:19 -     LMT     1867 Oct 18
                         -8:57:41 -     LMT     1900 Aug 20 12:00
                         -8:00  -       PST     1942
                         -8:00  US      P%sT    1946
                         -8:00  -       PST     1969
                         -8:00  US      P%sT    1980 Apr 27  2:00
                         -9:00  US      Y%sT    1980 Oct 26  2:00
                         -8:00  US      P%sT    1983 Oct 30  2:00
                         -9:00  US      Y%sT    1983 Nov 30
                         -9:00  US      AK%sT
Zone America/Sitka       14:58:47 -     LMT     1867 Oct 18
                         -9:01:13 -     LMT     1900 Aug 20 12:00
                         -8:00  -       PST     1942
                         -8:00  US      P%sT    1946
                         -8:00  -       PST     1969
                         -8:00  US      P%sT    1983 Oct 30  2:00
                         -9:00  US      Y%sT    1983 Nov 30
                         -9:00  US      AK%sT
Zone America/Metlakatla  15:13:42 -     LMT     1867 Oct 18
                         -8:46:18 -     LMT     1900 Aug 20 12:00
                         -8:00  -       PST     1942
                         -8:00  US      P%sT    1946
                         -8:00  -       PST     1969
                         -8:00  US      P%sT    1983 Oct 30  2:00
                         -8:00  -       PST     2015 Nov  1  2:00
                         -9:00  US      AK%sT
Zone America/Yakutat     14:41:05 -     LMT     1867 Oct 18
                         -9:18:55 -     LMT     1900 Aug 20 12:00
                         -9:00  -       YST     1942
                         -9:00  US      Y%sT    1946
                         -9:00  -       YST     1969
                         -9:00  US      Y%sT    1983 Nov 30
                         -9:00  US      AK%sT
Zone America/Anchorage   14:00:24 -     LMT     1867 Oct 18
                         -9:59:36 -     LMT     1900 Aug 20 12:00
                        -10:00  -       AST     1942
                        -10:00  US      A%sT    1967 Apr
                        -10:00  -       AHST    1969
                        -10:00  US      AH%sT   1983 Oct 30  2:00
                         -9:00  US      Y%sT    1983 Nov 30
                         -9:00  US      AK%sT
Zone America/Nome        12:58:21 -     LMT     1867 Oct 18
                        -11:01:38 -     LMT     1900 Aug 20 12:00
                        -11:00  -       NST     1942
                        -11:00  US      N%sT    1946
                        -11:00  -       NST     1967 Apr
                        -11:00  -       BST     1969
                        -11:00  US      B%sT    1983 Oct 30  2:00
                         -9:00  US      Y%sT    1983 Nov 30
                         -9:00  US      AK%sT
Zone America/Adak        12:13:21 -     LMT     1867 Oct 18
                        -11:46:38 -     LMT     1900 Aug 20 12:00
                        -11:00  -       NST     1942
                        -11:00  US      N%sT    1946
                        -11:00  -       NST     1967 Apr
                        -11:00  -       BST     1969
                        -11:00  US      B%sT    1983 Oct 30  2:00
                        -10:00  US      AH%sT   1983 Nov 30
                        -10:00  US      H%sT
# The following switches don't quite make our 1970 cutoff.
#
# Shanks writes that part of southwest Alaska (e.g. Aniak)
# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
# and another part (e.g. Akiak) made the same switch five weeks later.
#
# From David Flater (2004-11-09):
# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
# Historic Preservation Commission, provided this information, which
# suggests that Unalaska deviated from statutory time from early 1967
# possibly until 1983:
#
#  Minutes of the Unalaska City Council Meeting, January 10, 1967:
#  "Except for St. Paul and Akutan, Unalaska is the only important
#  location not on Alaska Standard Time.  The following resolution was
#  made by William Robinson and seconded by Henry Swanson: Be it
#  resolved that the City of Unalaska hereby goes to Alaska Standard
#  Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
#  January 14, Alaska Standard Time.)  This resolution was passed with
#  three votes for and one against."

# Hawaii

# From Arthur David Olson (2010-12-09):
# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
# the article is available at
# http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
# and indicates that standard time was adopted effective noon, January
# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
# saving for the period between the last Sunday of each April and the
# last Sunday of each September, but less than a month later repealed the
# act," (page 220), that year-round daylight saving time was in effect
# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
# when clocks changed) and that clocks were changed by 30 minutes
# effective the second Sunday of June, 1947 (page 219, with no time of
# day given for when clocks changed). A footnote for the 1933 changes
# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
# and Act 163 (approved 21 May 1933)."

# From Arthur David Olson (2011-01-19):
# The following is from "Laws of the Territory of Hawaii Passed by the
# Seventeenth Legislature: Regular Session 1933," available (as of
# 2011-01-19) at American University's Pence Law Library. Page 85: "Act
# 90...At 2 o'clock ante meridian of the last Sunday in April of each
# year, the standard time of this Territory shall be advanced one
# hour...This Act shall take effect upon its approval. Approved this 26th
# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
# hereby repealed...This Act shall take effect upon its approval, upon
# which date the standard time of this Territory shall be restored to
# that existing immediately prior to the taking effect of said Act 90.
# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
# of the Territory of Hawaii."
#
# Note that 1933-05-21 was a Sunday.
# We're left to guess the time of day when Act 163 was approved; guess noon.

# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone Pacific/Honolulu   -10:31:26 -     LMT     1896 Jan 13 12:00
                        -10:30  -       HST     1933 Apr 30  2:00
                        -10:30  1:00    HDT     1933 May 21 12:00
                        -10:30  -       HST     1942 Feb  9  2:00
                        -10:30  1:00    HDT     1945 Sep 30  2:00
                        -10:30  -       HST     1947 Jun  8  2:00
                        -10:00  -       HST

# Now we turn to US areas that have diverged from the consensus since 1970.

# Arizona mostly uses MST.

# From Paul Eggert (2002-10-20):
#
# The information in the rest of this paragraph is derived from the
# Daylight Saving Time web page
# <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
# maintained by the Arizona State Library, Archives and Public Records.
# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
# time, but by federal law railroads, airlines, bus lines, military
# personnel, and some engaged in interstate commerce continued to
# observe war (i.e., daylight saving) time.  The 1944-03-17 Phoenix
# Gazette says that was the date the law changed, and that 04-01 was
# the date the state's clocks would change.  In 1945 the State of
# Arizona used standard time all year, again with exceptions only as
# mandated by federal law.  Arizona observed DST in 1967, but Arizona
# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
#
# Shanks says the 1944 experiment came to an end on 1944-03-17.
# Go with the Arizona State Library instead.

# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Phoenix    -7:28:18 -      LMT     1883 Nov 18 11:31:42
                        -7:00   US      M%sT    1944 Jan  1  0:01
                        -7:00   -       MST     1944 Apr  1  0:01
                        -7:00   US      M%sT    1944 Oct  1  0:01
                        -7:00   -       MST     1967
                        -7:00   US      M%sT    1968 Mar 21
                        -7:00   -       MST
# From Arthur David Olson (1988-02-13):
# A writer from the Inter Tribal Council of Arizona, Inc.,
# notes in private correspondence dated 1987-12-28 that "Presently, only the
# Navajo Nation participates in the Daylight Saving Time policy, due to its
# large size and location in three states."  (The "only" means that other
# tribal nations don't use DST.)
#
# From Paul Eggert (2013-08-26):
# See America/Denver for a zone appropriate for the Navajo Nation.

# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
# Teton, Twin Falls, Valley, Washington counties, and the southern
# quarter of Idaho county) and eastern Oregon (most of Malheur County)
# switched four weeks late in 1974.
#
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Boise      -7:44:49 -      LMT     1883 Nov 18 12:15:11
                        -8:00   US      P%sT    1923 May 13  2:00
                        -7:00   US      M%sT    1974
                        -7:00   -       MST     1974 Feb  3  2:00
                        -7:00   US      M%sT

# Indiana
#
# For a map of Indiana's time zone regions, see:
# http://en.wikipedia.org/wiki/Time_in_Indiana
#
# From Paul Eggert (2007-08-17):
# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
# with the following exceptions:
#
# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
#   Vanderburgh, and Warrick counties have been like America/Chicago.
#
# - Dearborn and Ohio counties have been like America/New_York.
#
# - Clark, Floyd, and Harrison counties have been like
#   America/Kentucky/Louisville.
#
# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
#   and Switzerland counties have their own time zone histories as noted below.
#
# Shanks partitioned Indiana into 345 regions, each with its own time history,
# and wrote "Even newspaper reports present contradictory information."
# Those Hoosiers!  Such a flighty and changeable people!
# Fortunately, most of the complexity occurred before our cutoff date of 1970.
#
# Other than Indianapolis, the Indiana place names are so nondescript
# that they would be ambiguous if we left them at the 'America' level.
# So we reluctantly put them all in a subdirectory 'America/Indiana'.

# From Paul Eggert (2014-06-26):
# https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana
# says "DOT is relocating the time zone boundary in Indiana to move Starke,
# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
# Eastern Time Zone to the Central Time Zone.... The effective date of
# this rule is 2 a.m. EST Sunday, April 2, 2006, which is the
# changeover date from standard time to Daylight Saving Time."
# Strictly speaking, this meant the affected counties changed their
# clocks twice that night, but this obviously was in error.  The intent
# was that 01:59:59 EST be followed by 02:00:00 CDT.

# From Gwillim Law (2007-02-10):
# The Associated Press has been reporting that Pulaski County, Indiana is
# going to switch from Central to Eastern Time on March 11, 2007....
# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule Indianapolis 1941  only    -       Jun     22      2:00    1:00    D
Rule Indianapolis 1941  1954    -       Sep     lastSun 2:00    0       S
Rule Indianapolis 1946  1954    -       Apr     lastSun 2:00    1:00    D
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Indiana/Indianapolis -5:44:38 - LMT        1883 Nov 18 12:15:22
                        -6:00   US      C%sT    1920
                        -6:00 Indianapolis C%sT 1942
                        -6:00   US      C%sT    1946
                        -6:00 Indianapolis C%sT 1955 Apr 24  2:00
                        -5:00   -       EST     1957 Sep 29  2:00
                        -6:00   -       CST     1958 Apr 27  2:00
                        -5:00   -       EST     1969
                        -5:00   US      E%sT    1971
                        -5:00   -       EST     2006
                        -5:00   US      E%sT
#
# Eastern Crawford County, Indiana, left its clocks alone in 1974,
# as well as from 1976 through 2005.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    Marengo 1951    only    -       Apr     lastSun 2:00    1:00    D
Rule    Marengo 1951    only    -       Sep     lastSun 2:00    0       S
Rule    Marengo 1954    1960    -       Apr     lastSun 2:00    1:00    D
Rule    Marengo 1954    1960    -       Sep     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Indiana/Marengo -5:45:23 - LMT     1883 Nov 18 12:14:37
                        -6:00   US      C%sT    1951
                        -6:00   Marengo C%sT    1961 Apr 30  2:00
                        -5:00   -       EST     1969
                        -5:00   US      E%sT    1974 Jan  6  2:00
                        -6:00   1:00    CDT     1974 Oct 27  2:00
                        -5:00   US      E%sT    1976
                        -5:00   -       EST     2006
                        -5:00   US      E%sT
#
# Daviess, Dubois, Knox, and Martin Counties, Indiana,
# switched from eastern to central time in April 2006, then switched back
# in November 2007.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule Vincennes  1946    only    -       Apr     lastSun 2:00    1:00    D
Rule Vincennes  1946    only    -       Sep     lastSun 2:00    0       S
Rule Vincennes  1953    1954    -       Apr     lastSun 2:00    1:00    D
Rule Vincennes  1953    1959    -       Sep     lastSun 2:00    0       S
Rule Vincennes  1955    only    -       May      1      0:00    1:00    D
Rule Vincennes  1956    1963    -       Apr     lastSun 2:00    1:00    D
Rule Vincennes  1960    only    -       Oct     lastSun 2:00    0       S
Rule Vincennes  1961    only    -       Sep     lastSun 2:00    0       S
Rule Vincennes  1962    1963    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Indiana/Vincennes -5:50:07 - LMT   1883 Nov 18 12:09:53
                        -6:00   US      C%sT    1946
                        -6:00 Vincennes C%sT    1964 Apr 26  2:00
                        -5:00   -       EST     1969
                        -5:00   US      E%sT    1971
                        -5:00   -       EST     2006 Apr  2  2:00
                        -6:00   US      C%sT    2007 Nov  4  2:00
                        -5:00   US      E%sT
#
# Perry County, Indiana, switched from eastern to central time in April 2006.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule Perry      1946    only    -       Apr     lastSun 2:00    1:00    D
Rule Perry      1946    only    -       Sep     lastSun 2:00    0       S
Rule Perry      1953    1954    -       Apr     lastSun 2:00    1:00    D
Rule Perry      1953    1959    -       Sep     lastSun 2:00    0       S
Rule Perry      1955    only    -       May      1      0:00    1:00    D
Rule Perry      1956    1963    -       Apr     lastSun 2:00    1:00    D
Rule Perry      1960    only    -       Oct     lastSun 2:00    0       S
Rule Perry      1961    only    -       Sep     lastSun 2:00    0       S
Rule Perry      1962    1963    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Indiana/Tell_City -5:47:03 - LMT   1883 Nov 18 12:12:57
                        -6:00   US      C%sT    1946
                        -6:00 Perry     C%sT    1964 Apr 26  2:00
                        -5:00   -       EST     1969
                        -5:00   US      E%sT    1971
                        -5:00   -       EST     2006 Apr  2  2:00
                        -6:00   US      C%sT
#
# Pike County, Indiana moved from central to eastern time in 1977,
# then switched back in 2006, then switched back again in 2007.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    Pike    1955    only    -       May      1      0:00    1:00    D
Rule    Pike    1955    1960    -       Sep     lastSun 2:00    0       S
Rule    Pike    1956    1964    -       Apr     lastSun 2:00    1:00    D
Rule    Pike    1961    1964    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Indiana/Petersburg -5:49:07 - LMT  1883 Nov 18 12:10:53
                        -6:00   US      C%sT    1955
                        -6:00   Pike    C%sT    1965 Apr 25  2:00
                        -5:00   -       EST     1966 Oct 30  2:00
                        -6:00   US      C%sT    1977 Oct 30  2:00
                        -5:00   -       EST     2006 Apr  2  2:00
                        -6:00   US      C%sT    2007 Nov  4  2:00
                        -5:00   US      E%sT
#
# Starke County, Indiana moved from central to eastern time in 1991,
# then switched back in 2006.
# From Arthur David Olson (1991-10-28):
# An article on page A3 of the Sunday, 1991-10-27 Washington Post
# notes that Starke County switched from Central time to Eastern time as of
# 1991-10-27.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    Starke  1947    1961    -       Apr     lastSun 2:00    1:00    D
Rule    Starke  1947    1954    -       Sep     lastSun 2:00    0       S
Rule    Starke  1955    1956    -       Oct     lastSun 2:00    0       S
Rule    Starke  1957    1958    -       Sep     lastSun 2:00    0       S
Rule    Starke  1959    1961    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Indiana/Knox -5:46:30 -    LMT     1883 Nov 18 12:13:30
                        -6:00   US      C%sT    1947
                        -6:00   Starke  C%sT    1962 Apr 29  2:00
                        -5:00   -       EST     1963 Oct 27  2:00
                        -6:00   US      C%sT    1991 Oct 27  2:00
                        -5:00   -       EST     2006 Apr  2  2:00
                        -6:00   US      C%sT
#
# Pulaski County, Indiana, switched from eastern to central time in
# April 2006 and then switched back in March 2007.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    Pulaski 1946    1960    -       Apr     lastSun 2:00    1:00    D
Rule    Pulaski 1946    1954    -       Sep     lastSun 2:00    0       S
Rule    Pulaski 1955    1956    -       Oct     lastSun 2:00    0       S
Rule    Pulaski 1957    1960    -       Sep     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Indiana/Winamac -5:46:25 - LMT     1883 Nov 18 12:13:35
                        -6:00   US      C%sT    1946
                        -6:00   Pulaski C%sT    1961 Apr 30  2:00
                        -5:00   -       EST     1969
                        -5:00   US      E%sT    1971
                        -5:00   -       EST     2006 Apr  2  2:00
                        -6:00   US      C%sT    2007 Mar 11  2:00
                        -5:00   US      E%sT
#
# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Indiana/Vevay -5:40:16 -   LMT     1883 Nov 18 12:19:44
                        -6:00   US      C%sT    1954 Apr 25  2:00
                        -5:00   -       EST     1969
                        -5:00   US      E%sT    1973
                        -5:00   -       EST     2006
                        -5:00   US      E%sT

# Part of Kentucky left its clocks alone in 1974.
# This also includes Clark, Floyd, and Harrison counties in Indiana.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule Louisville 1921    only    -       May     1       2:00    1:00    D
Rule Louisville 1921    only    -       Sep     1       2:00    0       S
Rule Louisville 1941    1961    -       Apr     lastSun 2:00    1:00    D
Rule Louisville 1941    only    -       Sep     lastSun 2:00    0       S
Rule Louisville 1946    only    -       Jun     2       2:00    0       S
Rule Louisville 1950    1955    -       Sep     lastSun 2:00    0       S
Rule Louisville 1956    1960    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Kentucky/Louisville -5:43:02 -     LMT     1883 Nov 18 12:16:58
                        -6:00   US      C%sT    1921
                        -6:00 Louisville C%sT   1942
                        -6:00   US      C%sT    1946
                        -6:00 Louisville C%sT   1961 Jul 23  2:00
                        -5:00   -       EST     1968
                        -5:00   US      E%sT    1974 Jan  6  2:00
                        -6:00   1:00    CDT     1974 Oct 27  2:00
                        -5:00   US      E%sT
#
# Wayne County, Kentucky
#
# From Lake Cumberland LIFE
# http://www.lake-cumberland.com/life/archive/news990129time.shtml
# (1999-01-29) via WKYM-101.7:
# Clinton County has joined Wayne County in asking the DoT to change from
# the Central to the Eastern time zone....  The Wayne County government made
# the same request in December.  And while Russell County officials have not
# taken action, the majority of respondents to a poll conducted there in
# August indicated they would like to change to "fast time" also.
# The three Lake Cumberland counties are the farthest east of any U.S.
# location in the Central time zone.
#
# From Rich Wales (2000-08-29):
# After prolonged debate, and despite continuing deep differences of opinion,
# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
# (-0500) time.  They won't "fall back" this year.  See Sara Shipley,
# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
#
# From Paul Eggert (2001-07-16):
# The final rule was published in the
# Federal Register 65, 160 (2000-08-17), pp 50154-50158.
# http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22
#
Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
                        -6:00   US      C%sT    1946
                        -6:00   -       CST     1968
                        -6:00   US      C%sT    2000 Oct 29  2:00
                        -5:00   US      E%sT


# From Rives McDow (2000-08-30):
# Here ... are all the changes in the US since 1985.
# Kearny County, KS (put all of county on central;
#       previously split between MST and CST) ... 1990-10
# Starke County, IN (from CST to EST) ... 1991-10
# Oliver County, ND (from MST to CST) ... 1992-10
# West Wendover, NV (from PST TO MST) ... 1999-10
# Wayne County, KY (from CST to EST) ... 2000-10
#
# From Paul Eggert (2001-07-17):
# We don't know where the line used to be within Kearny County, KS,
# so omit that change for now.
# See America/Indiana/Knox for the Starke County, IN change.
# See America/North_Dakota/Center for the Oliver County, ND change.
# West Wendover, NV officially switched from Pacific to mountain time on
# 1999-10-31.  See the
# Federal Register 64, 203 (1999-10-21), pp 56705-56707.
# http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15
# However, the Federal Register says that West Wendover already operated
# on mountain time, and the rule merely made this official;
# hence a separate tz entry is not needed.

# Michigan
#
# From Bob Devine (1988-01-28):
# Michigan didn't observe DST from 1968 to 1973.
#
# From Paul Eggert (1999-03-31):
# Shanks writes that Michigan started using standard time on 1885-09-18,
# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
# that Detroit kept
#
#       local time until 1900 when the City Council decreed that clocks should
#       be put back twenty-eight minutes to Central Standard Time.  Half the
#       city obeyed, half refused.  After considerable debate, the decision
#       was rescinded and the city reverted to Sun time.  A derisive offer to
#       erect a sundial in front of the city hall was referred to the
#       Committee on Sewers.  Then, in 1905, Central time was adopted
#       by city vote.
#
# This story is too entertaining to be false, so go with Howse over Shanks.
#
# From Paul Eggert (2001-03-06):
# Garland (1927) writes "Cleveland and Detroit advanced their clocks
# one hour in 1914."  This change is not in Shanks.  We have no more
# info, so omit this for now.
#
# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule    Detroit 1948    only    -       Apr     lastSun 2:00    1:00    D
Rule    Detroit 1948    only    -       Sep     lastSun 2:00    0       S
Rule    Detroit 1967    only    -       Jun     14      2:00    1:00    D
Rule    Detroit 1967    only    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Detroit    -5:32:11 -      LMT     1905
                        -6:00   -       CST     1915 May 15  2:00
                        -5:00   -       EST     1942
                        -5:00   US      E%sT    1946
                        -5:00   Detroit E%sT    1973
                        -5:00   US      E%sT    1975
                        -5:00   -       EST     1975 Apr 27  2:00
                        -5:00   US      E%sT
#
# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
# switched from EST to CST/CDT in 1973.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
Rule Menominee  1946    only    -       Apr     lastSun 2:00    1:00    D
Rule Menominee  1946    only    -       Sep     lastSun 2:00    0       S
Rule Menominee  1966    only    -       Apr     lastSun 2:00    1:00    D
Rule Menominee  1966    only    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Menominee  -5:50:27 -      LMT     1885 Sep 18 12:00
                        -6:00   US      C%sT    1946
                        -6:00 Menominee C%sT    1969 Apr 27  2:00
                        -5:00   -       EST     1973 Apr 29  2:00
                        -6:00   US      C%sT

# Navassa
# administered by the US Fish and Wildlife Service
# claimed by US under the provisions of the 1856 Guano Islands Act
# also claimed by Haiti
# occupied 1857/1900 by the Navassa Phosphate Co
# US lighthouse 1917/1996-09
# currently uninhabited
# see Mark Fineman, "An Isle Rich in Guano and Discord",
# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
# Jimmy Skaggs, _The Great Guano Rush_ (1994).

################################################################################


# From Paul Eggert (2017-02-10):
#
# Unless otherwise specified, the source for data through 1990 is:
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
# San Diego: ACS Publications, Inc. (2003).
# Unfortunately this book contains many errors and cites no sources.
#
# Many years ago Gwillim Law wrote that a good source
# for time zone data was the International Air Transport
# Association's Standard Schedules Information Manual (IATA SSIM),
# published semiannually.  Law sent in several helpful summaries
# of the IATA's data after 1990.  Except where otherwise noted,
# IATA SSIM is the source for entries after 1990.
#
# Other sources occasionally used include:
#
#       Edward W. Whitman, World Time Differences,
#       Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
#       which I found in the UCLA library.
#
#       William Willett, The Waste of Daylight, 19th edition
#       <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
#       [PDF] (1914-03)
#
#       Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
#       <http://www.jstor.org/stable/1774359>.
#
# See the 'europe' file for Greenland.

# Canada

# From Alain LaBonté (1994-11-14):
# I post here the time zone abbreviations standardized in Canada
# for both English and French in the CAN/CSA-Z234.4-89 standard....
#
#       UTC     Standard time   Daylight saving time
#       offset  French  English French  English
#       -2:30   -       -       HAT     NDT
#       -3      -       -       HAA     ADT
#       -3:30   HNT     NST     -       -
#       -4      HNA     AST     HAE     EDT
#       -5      HNE     EST     HAC     CDT
#       -6      HNC     CST     HAR     MDT
#       -7      HNR     MST     HAP     PDT
#       -8      HNP     PST     HAY     YDT
#       -9      HNY     YST     -       -
#
#       HN: Heure Normale       ST: Standard Time
#       HA: Heure Avancée       DT: Daylight saving Time
#
#       A: de l'Atlantique      Atlantic
#       C: du Centre            Central
#       E: de l'Est             Eastern
#       M:                      Mountain
#       N:                      Newfoundland
#       P: du Pacifique         Pacific
#       R: des Rocheuses
#       T: de Terre-Neuve
#       Y: du Yukon             Yukon
#
# From Paul Eggert (1994-11-22):
# Alas, this sort of thing must be handled by localization software.

# Unless otherwise specified, the data entries for Canada are all from Shanks
# & Pottenger.

# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
# 2007-03-01):
# The British Columbia government announced yesterday that it will
# adjust daylight savings next year to align with changes in the
# U.S. and the rest of Canada....
# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
# ...
# Nova Scotia
# Daylight saving time will be extended by four weeks starting in 2007....
# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
#
# [For New Brunswick] the new legislation dictates that the time change is to
# be done at 02:00 instead of 00:01.
# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
# ...
# Manitoba has traditionally changed the clock every fall at 03:00.
# As of 2006, the transition is to take place one hour earlier at 02:00.
# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
# ...
# [Alberta, Ontario, Quebec] will follow US rules.
# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
# ...
# P.E.I. will follow US rules....
# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
# ...
# Province of Newfoundland and Labrador....
# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
# ...
# Yukon
# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
# ...
# N.W.T. will follow US rules.  Whoever maintains the government web site
# does not seem to believe in bookmarks.  To see the news release, click the
# following link and search for "Daylight Savings Time Change".  Press the
# "Daylight Savings Time Change" link; it will fire off a popup using
# JavaScript.
# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
# ...
# Nunavut
# An amendment to the Interpretation Act was registered on February 19/2007....
# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf

# From Paul Eggert (2014-10-18):
# H. David Matthews and Mary Vincent's map
# "It's about TIME", _Canadian Geographic_ (September-October 1998)
# http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
# contains detailed boundaries for regions observing nonstandard
# time and daylight saving time arrangements in Canada circa 1998.
#
# National Research Council Canada maintains info about time zones and DST.
# http://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html
# http://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5
# Its unofficial information is often taken from Matthews and Vincent.

# From Paul Eggert (2006-06-27):
# For now, assume all of DST-observing Canada will fall into line with the
# new US DST rules,

# From Chris Walton (2011-12-01)
# In the first of Tammy Hardwick's articles
# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
# she quotes the Friday November 1/1918 edition of the Creston Review.
# The quote includes these two statements:
# 'Sunday the CPR went back to the old system of time...'
# '... The daylight saving scheme was dropped all over Canada at the same time,'
# These statements refer to a transition from daylight time to standard time
# that occurred nationally on Sunday October 27/1918.  This transition was
# also documented in the Saturday October 26/1918 edition of the Toronto Star.

# In light of that evidence, we alter the date from the earlier believed
# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
# than Thursday) in all Canadian rulesets.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Canada  1918    only    -       Apr     14      2:00    1:00    D
Rule    Canada  1918    only    -       Oct     27      2:00    0       S
Rule    Canada  1942    only    -       Feb      9      2:00    1:00    W # War
Rule    Canada  1945    only    -       Aug     14      23:00u  1:00    P # Peace
Rule    Canada  1945    only    -       Sep     30      2:00    0       S
Rule    Canada  1974    1986    -       Apr     lastSun 2:00    1:00    D
Rule    Canada  1974    2006    -       Oct     lastSun 2:00    0       S
Rule    Canada  1987    2006    -       Apr     Sun>=1  2:00    1:00    D
Rule    Canada  2007    max     -       Mar     Sun>=8  2:00    1:00    D
Rule    Canada  2007    max     -       Nov     Sun>=1  2:00    0       S


# Newfoundland and Labrador

# From Paul Eggert (2000-10-02):
# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
# but the only part of Labrador that follows the rules is the
# southeast corner, including Port Hope Simpson and Mary's Harbour,
# but excluding, say, Black Tickle.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    StJohns 1917    only    -       Apr      8      2:00    1:00    D
Rule    StJohns 1917    only    -       Sep     17      2:00    0       S
# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
Rule    StJohns 1919    only    -       May      5      23:00   1:00    D
Rule    StJohns 1919    only    -       Aug     12      23:00   0       S
# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
Rule    StJohns 1920    1935    -       May     Sun>=1  23:00   1:00    D
Rule    StJohns 1920    1935    -       Oct     lastSun 23:00   0       S
# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
# Pottenger.
Rule    StJohns 1936    1941    -       May     Mon>=9  0:00    1:00    D
Rule    StJohns 1936    1941    -       Oct     Mon>=2  0:00    0       S
# Whitman gives the following transitions:
# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
# but go with Shanks & Pottenger and assume they used Canadian rules.
# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
# Apr 30 - Sep 24; go with Shanks & Pottenger.
Rule    StJohns 1946    1950    -       May     Sun>=8  2:00    1:00    D
Rule    StJohns 1946    1950    -       Oct     Sun>=2  2:00    0       S
Rule    StJohns 1951    1986    -       Apr     lastSun 2:00    1:00    D
Rule    StJohns 1951    1959    -       Sep     lastSun 2:00    0       S
Rule    StJohns 1960    1986    -       Oct     lastSun 2:00    0       S
# From Paul Eggert (2000-10-02):
# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
# at 00:01 local time.  For now, assume it started in 1987.

# From Michael Pelley (2011-09-12):
# We received today, Monday, September 12, 2011, notification that the
# changes to the Newfoundland Standard Time Act have been proclaimed.
# The change in the Act stipulates that the change from Daylight Savings
# Time to Standard Time and from Standard Time to Daylight Savings Time
# now occurs at 2:00AM.
# ...
# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
# ...
# MICHAEL PELLEY  |  Manager of Enterprise Architecture - Solution Delivery
# Office of the Chief Information Officer
# Executive Council
# Government of Newfoundland & Labrador

Rule    StJohns 1987    only    -       Apr     Sun>=1  0:01    1:00    D
Rule    StJohns 1987    2006    -       Oct     lastSun 0:01    0       S
Rule    StJohns 1988    only    -       Apr     Sun>=1  0:01    2:00    DD
Rule    StJohns 1989    2006    -       Apr     Sun>=1  0:01    1:00    D
Rule    StJohns 2007    2011    -       Mar     Sun>=8  0:01    1:00    D
Rule    StJohns 2007    2010    -       Nov     Sun>=1  0:01    0       S
#
# St John's has an apostrophe, but Posix file names can't have apostrophes.
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/St_Johns   -3:30:52 -      LMT     1884
                        -3:30:52 StJohns N%sT   1918
                        -3:30:52 Canada N%sT    1919
                        -3:30:52 StJohns N%sT   1935 Mar 30
                        -3:30   StJohns N%sT    1942 May 11
                        -3:30   Canada  N%sT    1946
                        -3:30   StJohns N%sT    2011 Nov
                        -3:30   Canada  N%sT

# most of east Labrador

# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Goose_Bay  -4:01:40 -      LMT     1884 # Happy Valley-Goose Bay
                        -3:30:52 -      NST     1918
                        -3:30:52 Canada N%sT    1919
                        -3:30:52 -      NST     1935 Mar 30
                        -3:30   -       NST     1936
                        -3:30   StJohns N%sT    1942 May 11
                        -3:30   Canada  N%sT    1946
                        -3:30   StJohns N%sT    1966 Mar 15  2:00
                        -4:00   StJohns A%sT    2011 Nov
                        -4:00   Canada  A%sT


# west Labrador, Nova Scotia, Prince Edward I

# From Brian Inglis (2015-07-20):
# From the historical weather station records available at:
# https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada
# Sydney shares the same time history as Glace Bay, so was
# likely to be the same across the island....
# Sydney, as the capital and most populous location, or Cape Breton, would
# have been better names for the zone had we known this in 1996.

# From Paul Eggert (2015-07-20):
# Shanks & Pottenger write that since 1970 most of this region has been like
# Halifax.  Many locales did not observe peacetime DST until 1972;
# the Cape Breton area, represented by Glace Bay, is the largest we know of
# (Glace Bay was perhaps not the best name choice but no point changing now).
# Shanks & Pottenger also write that Liverpool, NS was the only town
# in Canada to observe DST in 1971 but not 1970; for now we'll assume
# this is a typo.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Halifax 1916    only    -       Apr      1      0:00    1:00    D
Rule    Halifax 1916    only    -       Oct      1      0:00    0       S
Rule    Halifax 1920    only    -       May      9      0:00    1:00    D
Rule    Halifax 1920    only    -       Aug     29      0:00    0       S
Rule    Halifax 1921    only    -       May      6      0:00    1:00    D
Rule    Halifax 1921    1922    -       Sep      5      0:00    0       S
Rule    Halifax 1922    only    -       Apr     30      0:00    1:00    D
Rule    Halifax 1923    1925    -       May     Sun>=1  0:00    1:00    D
Rule    Halifax 1923    only    -       Sep      4      0:00    0       S
Rule    Halifax 1924    only    -       Sep     15      0:00    0       S
Rule    Halifax 1925    only    -       Sep     28      0:00    0       S
Rule    Halifax 1926    only    -       May     16      0:00    1:00    D
Rule    Halifax 1926    only    -       Sep     13      0:00    0       S
Rule    Halifax 1927    only    -       May      1      0:00    1:00    D
Rule    Halifax 1927    only    -       Sep     26      0:00    0       S
Rule    Halifax 1928    1931    -       May     Sun>=8  0:00    1:00    D
Rule    Halifax 1928    only    -       Sep      9      0:00    0       S
Rule    Halifax 1929    only    -       Sep      3      0:00    0       S
Rule    Halifax 1930    only    -       Sep     15      0:00    0       S
Rule    Halifax 1931    1932    -       Sep     Mon>=24 0:00    0       S
Rule    Halifax 1932    only    -       May      1      0:00    1:00    D
Rule    Halifax 1933    only    -       Apr     30      0:00    1:00    D
Rule    Halifax 1933    only    -       Oct      2      0:00    0       S
Rule    Halifax 1934    only    -       May     20      0:00    1:00    D
Rule    Halifax 1934    only    -       Sep     16      0:00    0       S
Rule    Halifax 1935    only    -       Jun      2      0:00    1:00    D
Rule    Halifax 1935    only    -       Sep     30      0:00    0       S
Rule    Halifax 1936    only    -       Jun      1      0:00    1:00    D
Rule    Halifax 1936    only    -       Sep     14      0:00    0       S
Rule    Halifax 1937    1938    -       May     Sun>=1  0:00    1:00    D
Rule    Halifax 1937    1941    -       Sep     Mon>=24 0:00    0       S
Rule    Halifax 1939    only    -       May     28      0:00    1:00    D
Rule    Halifax 1940    1941    -       May     Sun>=1  0:00    1:00    D
Rule    Halifax 1946    1949    -       Apr     lastSun 2:00    1:00    D
Rule    Halifax 1946    1949    -       Sep     lastSun 2:00    0       S
Rule    Halifax 1951    1954    -       Apr     lastSun 2:00    1:00    D
Rule    Halifax 1951    1954    -       Sep     lastSun 2:00    0       S
Rule    Halifax 1956    1959    -       Apr     lastSun 2:00    1:00    D
Rule    Halifax 1956    1959    -       Sep     lastSun 2:00    0       S
Rule    Halifax 1962    1973    -       Apr     lastSun 2:00    1:00    D
Rule    Halifax 1962    1973    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Halifax    -4:14:24 -      LMT     1902 Jun 15
                        -4:00   Halifax A%sT    1918
                        -4:00   Canada  A%sT    1919
                        -4:00   Halifax A%sT    1942 Feb  9  2:00s
                        -4:00   Canada  A%sT    1946
                        -4:00   Halifax A%sT    1974
                        -4:00   Canada  A%sT
Zone America/Glace_Bay  -3:59:48 -      LMT     1902 Jun 15
                        -4:00   Canada  A%sT    1953
                        -4:00   Halifax A%sT    1954
                        -4:00   -       AST     1972
                        -4:00   Halifax A%sT    1974
                        -4:00   Canada  A%sT

# New Brunswick

# From Paul Eggert (2007-01-31):
# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
# says they changed at 00:01 through 2006, and
# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
# clear that this was the case since at least 1993.
# For now, assume it started in 1993.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Moncton 1933    1935    -       Jun     Sun>=8  1:00    1:00    D
Rule    Moncton 1933    1935    -       Sep     Sun>=8  1:00    0       S
Rule    Moncton 1936    1938    -       Jun     Sun>=1  1:00    1:00    D
Rule    Moncton 1936    1938    -       Sep     Sun>=1  1:00    0       S
Rule    Moncton 1939    only    -       May     27      1:00    1:00    D
Rule    Moncton 1939    1941    -       Sep     Sat>=21 1:00    0       S
Rule    Moncton 1940    only    -       May     19      1:00    1:00    D
Rule    Moncton 1941    only    -       May      4      1:00    1:00    D
Rule    Moncton 1946    1972    -       Apr     lastSun 2:00    1:00    D
Rule    Moncton 1946    1956    -       Sep     lastSun 2:00    0       S
Rule    Moncton 1957    1972    -       Oct     lastSun 2:00    0       S
Rule    Moncton 1993    2006    -       Apr     Sun>=1  0:01    1:00    D
Rule    Moncton 1993    2006    -       Oct     lastSun 0:01    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Moncton    -4:19:08 -      LMT     1883 Dec  9
                        -5:00   -       EST     1902 Jun 15
                        -4:00   Canada  A%sT    1933
                        -4:00   Moncton A%sT    1942
                        -4:00   Canada  A%sT    1946
                        -4:00   Moncton A%sT    1973
                        -4:00   Canada  A%sT    1993
                        -4:00   Moncton A%sT    2007
                        -4:00   Canada  A%sT

# Quebec

# From Paul Eggert (2015-03-24):
# See America/Toronto for most of Quebec, including Montreal.
#
# Matthews and Vincent (1998) also write that Quebec east of the -63
# meridian is supposed to observe AST, but residents as far east as
# Natashquan use EST/EDT, and residents east of Natashquan use AST.
# The Quebec department of justice writes in
# "The situation in Minganie and Basse-Côte-Nord"
# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
# that the coastal strip from just east of Natashquan to Blanc-Sablon
# observes Atlantic standard time all year round.
# http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
# says this common practice was codified into law as of 2007.
# For lack of better info, guess this practice began around 1970, contra to
# Shanks & Pottenger who have this region observing AST/ADT.

# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Blanc-Sablon -3:48:28 -    LMT     1884
                        -4:00   Canada  A%sT    1970
                        -4:00   -       AST

# Ontario

# From Paul Eggert (2006-07-09):
# Shanks & Pottenger write that since 1970 most of Ontario has been like
# Toronto.
# Thunder Bay skipped DST in 1973.
# Many smaller locales did not observe peacetime DST until 1974;
# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.

# From Mark Brader (2003-07-26):
# [According to the Toronto Star] Orillia, Ontario, adopted DST
# effective Saturday, 1912-06-22, 22:00; the article mentions that
# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
# have already done so.  In Orillia DST was to run until Saturday,
# 1912-08-31 (no time mentioned), but it was met with considerable
# hostility from certain segments of the public, and was revoked after
# only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but
# presumably that should be -07-06.  (1912-06-19, -07-12; also letters
# earlier in June).
#
# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).

# From Paul Eggert (1997-10-17):
# Mark Brader writes that an article in the 1997-10-14 Toronto Star
# says that Atikokan, Ontario currently does not observe DST,
# but will vote on 11-10 whether to use EST/EDT.
# He also writes that the Ontario Time Act (1990, Chapter T.9)
# http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
# Officially Atikokan is therefore on CST/CDT, and most likely this report
# concerns a non-official time observed as a matter of local practice.
#
# From Paul Eggert (2000-10-02):
# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
# New Osnaburgh observe CST all year, that Big Trout Lake observes
# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
# violation of the official Ontario rules.
#
# From Paul Eggert (2006-07-09):
# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
# 2005-07-21 Chronicle-Journal, which said:
#
#       The clocks in Atikokan stay set on standard time year-round.
#       This means they spend about half the time on central time and
#       the other half on eastern time.
#
#       For the most part, the system works, Mayor Dennis Brown said.
#
#       "The majority of businesses in Atikokan deal more with Eastern
#       Canada, but there are some that deal with Western Canada," he
#       said.  "I don't see any changes happening here."
#
# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
# [New Osnaburgh] follow the same practice."

# From Garry McKinnon (2006-07-14) via Chris Walton:
# I chatted with a member of my board who has an outstanding memory
# and a long history in Atikokan (and in the telecom industry) and he
# can say for certain that Atikokan has been practicing the current
# time keeping since 1952, at least.

# From Paul Eggert (2006-07-17):
# Shanks & Pottenger say that Atikokan has agreed with Rainy River
# ever since standard time was introduced, but the information from
# McKinnon sounds more authoritative.  For now, assume that Atikokan
# switched to EST immediately after WWII era daylight saving time
# ended.  This matches the old (less-populous) America/Coral_Harbour
# entry since our cutoff date of 1970, so we can move
# America/Coral_Harbour to the 'backward' file.

# From Mark Brader (2010-03-06):
#
# Currently the database has:
#
# # Ontario
#
# # From Paul Eggert (2006-07-09):
# # Shanks & Pottenger write that since 1970 most of Ontario has been like
# # Toronto.
# # Thunder Bay skipped DST in 1973.
# # Many smaller locales did not observe peacetime DST until 1974;
# # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
#
# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
# right corner of page 1, it says that Toronto will return to standard
# time at 2 am Sunday morning (which agrees with the database), and that:
#
#     The one-hour setback will go into effect throughout most of Ontario,
#     except in areas like Windsor which remains on standard time all year.
#
# Windsor is, of course, a lot larger than Nipigon.
#
# I only came across this incidentally.  I don't know if Windsor began
# observing DST when Detroit did, or in 1974, or on some other date.
#
# By the way, the article continues by noting that:
#
#     Some cities in the United States have pushed the deadline back
#     three weeks and will change over from daylight saving in October.

# From Arthur David Olson (2010-07-17):
#
# "Standard Time and Time Zones in Canada" appeared in
# The Journal of The Royal Astronomical Society of Canada,
# volume 26, number 2 (February 1932) and, as of 2010-07-17,
# was available at
# http://adsabs.harvard.edu/full/1932JRASC..26...49S
#
# It includes the text below (starting on page 57):
#
#   A list of the places in Canada using daylight saving time would
# require yearly revision. From information kindly furnished by
# the provincial governments and by the postmasters in many cities
# and towns, it is found that the following places used daylight sav-
# ing in 1930. The information for the province of Quebec is definite,
# for the other provinces only approximate:
#
#       Province        Daylight saving time used
# Prince Edward Island  Not used.
# Nova Scotia           In Halifax only.
# New Brunswick         In St. John only.
# Quebec                In the following places:
#                       Montreal        Lachine
#                       Quebec          Mont-Royal
#                       Lévis           Iberville
#                       St. Lambert     Cap de la Madelèine
#                       Verdun          Loretteville
#                       Westmount       Richmond
#                       Outremont       St. Jérôme
#                       Longueuil       Greenfield Park
#                       Arvida          Waterloo
#                       Chambly-Canton  Beaulieu
#                       Melbourne       La Tuque
#                       St. Théophile   Buckingham
# Ontario               Used generally in the cities and towns along
#                       the southerly part of the province. Not
#                       used in the northwesterly part.
# Manitoba              Not used.
# Saskatchewan          In Regina only.
# Alberta               Not used.
# British Columbia      Not used.
#
#   With some exceptions, the use of daylight saving may be said to be limited
# to those cities and towns lying between Quebec city and Windsor, Ont.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Toronto 1919    only    -       Mar     30      23:30   1:00    D
Rule    Toronto 1919    only    -       Oct     26      0:00    0       S
Rule    Toronto 1920    only    -       May      2      2:00    1:00    D
Rule    Toronto 1920    only    -       Sep     26      0:00    0       S
Rule    Toronto 1921    only    -       May     15      2:00    1:00    D
Rule    Toronto 1921    only    -       Sep     15      2:00    0       S
Rule    Toronto 1922    1923    -       May     Sun>=8  2:00    1:00    D
# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
# was meant.
Rule    Toronto 1922    1926    -       Sep     Sun>=15 2:00    0       S
Rule    Toronto 1924    1927    -       May     Sun>=1  2:00    1:00    D
# The 1927-to-1939 rules can be expressed more simply as
# Rule  Toronto 1927    1937    -       Sep     Sun>=25 2:00    0       S
# Rule  Toronto 1928    1937    -       Apr     Sun>=25 2:00    1:00    D
# Rule  Toronto 1938    1940    -       Apr     lastSun 2:00    1:00    D
# Rule  Toronto 1938    1939    -       Sep     lastSun 2:00    0       S
# The rules below avoid use of Sun>=25
# (which pre-2004 versions of zic cannot handle).
Rule    Toronto 1927    1932    -       Sep     lastSun 2:00    0       S
Rule    Toronto 1928    1931    -       Apr     lastSun 2:00    1:00    D
Rule    Toronto 1932    only    -       May     1       2:00    1:00    D
Rule    Toronto 1933    1940    -       Apr     lastSun 2:00    1:00    D
Rule    Toronto 1933    only    -       Oct     1       2:00    0       S
Rule    Toronto 1934    1939    -       Sep     lastSun 2:00    0       S
Rule    Toronto 1945    1946    -       Sep     lastSun 2:00    0       S
Rule    Toronto 1946    only    -       Apr     lastSun 2:00    1:00    D
Rule    Toronto 1947    1949    -       Apr     lastSun 0:00    1:00    D
Rule    Toronto 1947    1948    -       Sep     lastSun 0:00    0       S
Rule    Toronto 1949    only    -       Nov     lastSun 0:00    0       S
Rule    Toronto 1950    1973    -       Apr     lastSun 2:00    1:00    D
Rule    Toronto 1950    only    -       Nov     lastSun 2:00    0       S
Rule    Toronto 1951    1956    -       Sep     lastSun 2:00    0       S
# Shanks & Pottenger say Toronto ended DST a week early in 1971,
# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
# is wrong, and that he had confirmed it by checking the 1971-10-30
# Toronto Star, which said that DST was ending 1971-10-31 as usual.
Rule    Toronto 1957    1973    -       Oct     lastSun 2:00    0       S

# From Paul Eggert (2003-07-27):
# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
# Port Arthur, Ontario, the principle of the Bill has been in
# operation for the past three years, and in the City of Moose Jaw,
# Saskatchewan, for one year."

# From David Bryan via Tory Tronrud, Director/Curator,
# Thunder Bay Museum (2003-11-12):
# There is some suggestion, however, that, by-law or not, daylight
# savings time was being practiced in Fort William and Port Arthur
# before 1909.... [I]n 1910, the line between the Eastern and Central
# Time Zones was permanently moved about two hundred miles west to
# include the Thunder Bay area....  When Canada adopted daylight
# savings time in 1916, Fort William and Port Arthur, having done so
# already, did not change their clocks....  During the Second World
# War,... [t]he cities agreed to implement DST during the summer
# months for the remainder of the war years.

# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Toronto    -5:17:32 -      LMT     1895
                        -5:00   Canada  E%sT    1919
                        -5:00   Toronto E%sT    1942 Feb  9  2:00s
                        -5:00   Canada  E%sT    1946
                        -5:00   Toronto E%sT    1974
                        -5:00   Canada  E%sT
Zone America/Thunder_Bay -5:57:00 -     LMT     1895
                        -6:00   -       CST     1910
                        -5:00   -       EST     1942
                        -5:00   Canada  E%sT    1970
                        -5:00   Toronto E%sT    1973
                        -5:00   -       EST     1974
                        -5:00   Canada  E%sT
Zone America/Nipigon    -5:53:04 -      LMT     1895
                        -5:00   Canada  E%sT    1940 Sep 29
                        -5:00   1:00    EDT     1942 Feb  9  2:00s
                        -5:00   Canada  E%sT
Zone America/Rainy_River -6:18:16 -     LMT     1895
                        -6:00   Canada  C%sT    1940 Sep 29
                        -6:00   1:00    CDT     1942 Feb  9  2:00s
                        -6:00   Canada  C%sT
Zone America/Atikokan   -6:06:28 -      LMT     1895
                        -6:00   Canada  C%sT    1940 Sep 29
                        -6:00   1:00    CDT     1942 Feb  9  2:00s
                        -6:00   Canada  C%sT    1945 Sep 30  2:00
                        -5:00   -       EST


# Manitoba

# From Rob Douglas (2006-04-06):
# the old Manitoba Time Act - as amended by Bill 2, assented to
# March 27, 1987 ... said ...
# "between two o'clock Central Standard Time in the morning of
# the first Sunday of April of each year and two o'clock Central
# Standard Time in the morning of the last Sunday of October next
# following, one hour in advance of Central Standard Time."...
# I believe that the English legislation [of the old time act] had
# been assented to (March 22, 1967)....
# Also, as far as I can tell, there was no order-in-council varying
# the time of Daylight Saving Time for 2005 and so the provisions of
# the 1987 version would apply - the changeover was at 2:00 Central
# Standard Time (i.e. not until 3:00 Central Daylight Time).

# From Paul Eggert (2006-04-10):
# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
# starting 1966.  Since 02:00s is clearly correct for 1967 on, assume
# it was also 02:00s in 1966.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Winn    1916    only    -       Apr     23      0:00    1:00    D
Rule    Winn    1916    only    -       Sep     17      0:00    0       S
Rule    Winn    1918    only    -       Apr     14      2:00    1:00    D
Rule    Winn    1918    only    -       Oct     27      2:00    0       S
Rule    Winn    1937    only    -       May     16      2:00    1:00    D
Rule    Winn    1937    only    -       Sep     26      2:00    0       S
Rule    Winn    1942    only    -       Feb      9      2:00    1:00    W # War
Rule    Winn    1945    only    -       Aug     14      23:00u  1:00    P # Peace
Rule    Winn    1945    only    -       Sep     lastSun 2:00    0       S
Rule    Winn    1946    only    -       May     12      2:00    1:00    D
Rule    Winn    1946    only    -       Oct     13      2:00    0       S
Rule    Winn    1947    1949    -       Apr     lastSun 2:00    1:00    D
Rule    Winn    1947    1949    -       Sep     lastSun 2:00    0       S
Rule    Winn    1950    only    -       May      1      2:00    1:00    D
Rule    Winn    1950    only    -       Sep     30      2:00    0       S
Rule    Winn    1951    1960    -       Apr     lastSun 2:00    1:00    D
Rule    Winn    1951    1958    -       Sep     lastSun 2:00    0       S
Rule    Winn    1959    only    -       Oct     lastSun 2:00    0       S
Rule    Winn    1960    only    -       Sep     lastSun 2:00    0       S
Rule    Winn    1963    only    -       Apr     lastSun 2:00    1:00    D
Rule    Winn    1963    only    -       Sep     22      2:00    0       S
Rule    Winn    1966    1986    -       Apr     lastSun 2:00s   1:00    D
Rule    Winn    1966    2005    -       Oct     lastSun 2:00s   0       S
Rule    Winn    1987    2005    -       Apr     Sun>=1  2:00s   1:00    D
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Winnipeg   -6:28:36 -      LMT     1887 Jul 16
                        -6:00   Winn    C%sT    2006
                        -6:00   Canada  C%sT


# Saskatchewan

# From Mark Brader (2003-07-26):
# The first actual adoption of DST in Canada was at the municipal
# level.  As the [Toronto] Star put it (1912-06-07), "While people
# elsewhere have long been talking of legislation to save daylight,
# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
# presumably late evening, as below), and would run until "the end of
# the summer".  The discrepancy between municipal time and railroad
# time was noted.

# From Paul Eggert (2003-07-27):
# Willett (1914-03) notes that DST "has been in operation ... in the
# City of Moose Jaw, Saskatchewan, for one year."

# From Paul Eggert (2006-03-22):
# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
# Other western towns (e.g. Lloydminster) are like Edmonton.
# Matthews and Vincent (1998) write that Denare Beach and Creighton
# are like Winnipeg, in violation of Saskatchewan law.

# From W. Jones (1992-11-06):
# The. . .below is based on information I got from our law library, the
# provincial archives, and the provincial Community Services department.
# A precise history would require digging through newspaper archives, and
# since you didn't say what you wanted, I didn't bother.
#
# Saskatchewan is split by a time zone meridian (105W) and over the years
# the boundary became pretty ragged as communities near it reevaluated
# their affiliations in one direction or the other.  In 1965 a provincial
# referendum favoured legislating common time practices.
#
# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
# Saskatchewan 1978) was proclaimed, and established that the eastern
# part of Saskatchewan would use CST year round, that districts in
# northwest Saskatchewan would by default follow CST but could opt to
# follow Mountain Time rules (thus 1 hour difference in the winter and
# zero in the summer), and that districts in southwest Saskatchewan would
# by default follow MT but could opt to follow CST.
#
# It took a few years for the dust to settle (I know one story of a town
# on one time zone having its school in another, such that a mom had to
# serve her family lunch in two shifts), but presently it seems that only
# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
# rules any more; all other districts appear to have used CST year round
# since sometime in the 1960s.

# From Chris Walton (2006-06-26):
# The Saskatchewan time act which was last updated in 1996 is about 30 pages
# long and rather painful to read.
# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Regina  1918    only    -       Apr     14      2:00    1:00    D
Rule    Regina  1918    only    -       Oct     27      2:00    0       S
Rule    Regina  1930    1934    -       May     Sun>=1  0:00    1:00    D
Rule    Regina  1930    1934    -       Oct     Sun>=1  0:00    0       S
Rule    Regina  1937    1941    -       Apr     Sun>=8  0:00    1:00    D
Rule    Regina  1937    only    -       Oct     Sun>=8  0:00    0       S
Rule    Regina  1938    only    -       Oct     Sun>=1  0:00    0       S
Rule    Regina  1939    1941    -       Oct     Sun>=8  0:00    0       S
Rule    Regina  1942    only    -       Feb      9      2:00    1:00    W # War
Rule    Regina  1945    only    -       Aug     14      23:00u  1:00    P # Peace
Rule    Regina  1945    only    -       Sep     lastSun 2:00    0       S
Rule    Regina  1946    only    -       Apr     Sun>=8  2:00    1:00    D
Rule    Regina  1946    only    -       Oct     Sun>=8  2:00    0       S
Rule    Regina  1947    1957    -       Apr     lastSun 2:00    1:00    D
Rule    Regina  1947    1957    -       Sep     lastSun 2:00    0       S
Rule    Regina  1959    only    -       Apr     lastSun 2:00    1:00    D
Rule    Regina  1959    only    -       Oct     lastSun 2:00    0       S
#
Rule    Swift   1957    only    -       Apr     lastSun 2:00    1:00    D
Rule    Swift   1957    only    -       Oct     lastSun 2:00    0       S
Rule    Swift   1959    1961    -       Apr     lastSun 2:00    1:00    D
Rule    Swift   1959    only    -       Oct     lastSun 2:00    0       S
Rule    Swift   1960    1961    -       Sep     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Regina     -6:58:36 -      LMT     1905 Sep
                        -7:00   Regina  M%sT    1960 Apr lastSun  2:00
                        -6:00   -       CST
Zone America/Swift_Current -7:11:20 -   LMT     1905 Sep
                        -7:00   Canada  M%sT    1946 Apr lastSun  2:00
                        -7:00   Regina  M%sT    1950
                        -7:00   Swift   M%sT    1972 Apr lastSun  2:00
                        -6:00   -       CST


# Alberta

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Edm     1918    1919    -       Apr     Sun>=8  2:00    1:00    D
Rule    Edm     1918    only    -       Oct     27      2:00    0       S
Rule    Edm     1919    only    -       May     27      2:00    0       S
Rule    Edm     1920    1923    -       Apr     lastSun 2:00    1:00    D
Rule    Edm     1920    only    -       Oct     lastSun 2:00    0       S
Rule    Edm     1921    1923    -       Sep     lastSun 2:00    0       S
Rule    Edm     1942    only    -       Feb      9      2:00    1:00    W # War
Rule    Edm     1945    only    -       Aug     14      23:00u  1:00    P # Peace
Rule    Edm     1945    only    -       Sep     lastSun 2:00    0       S
Rule    Edm     1947    only    -       Apr     lastSun 2:00    1:00    D
Rule    Edm     1947    only    -       Sep     lastSun 2:00    0       S
Rule    Edm     1967    only    -       Apr     lastSun 2:00    1:00    D
Rule    Edm     1967    only    -       Oct     lastSun 2:00    0       S
Rule    Edm     1969    only    -       Apr     lastSun 2:00    1:00    D
Rule    Edm     1969    only    -       Oct     lastSun 2:00    0       S
Rule    Edm     1972    1986    -       Apr     lastSun 2:00    1:00    D
Rule    Edm     1972    2006    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Edmonton   -7:33:52 -      LMT     1906 Sep
                        -7:00   Edm     M%sT    1987
                        -7:00   Canada  M%sT


# British Columbia

# From Paul Eggert (2006-03-22):
# Shanks & Pottenger write that since 1970 most of this region has
# been like Vancouver.
# Dawson Creek uses MST.  Much of east BC is like Edmonton.
# Matthews and Vincent (1998) write that Creston is like Dawson Creek.

# It seems though that (re: Creston) is not entirely correct:

# From Chris Walton (2011-12-01):
# There are two areas within the Canadian province of British Columbia
# that do not currently observe daylight saving:
# a) The Creston Valley (includes the town of Creston and surrounding area)
# b) The eastern half of the Peace River Regional District
# (includes the cities of Dawson Creek and Fort St. John)

# Earlier this year I stumbled across a detailed article about the time
# keeping history of Creston; it was written by Tammy Hardwick who is the
# manager of the Creston & District Museum. The article was written in May 2009.
# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
# According to the article, Creston has not changed its clocks since June 1918.
# i.e. Creston has been stuck on UTC-7 for 93 years.
# Dawson Creek, on the other hand, changed its clocks as recently as April 1972.

# Unfortunately the exact date for the time change in June 1918 remains
# unknown and will be difficult to ascertain.  I e-mailed Tammy a few months
# ago to ask if Sunday June 2 was a reasonable guess.  She said it was just
# as plausible as any other date (in June).  She also said that after writing
# the article she had discovered another time change in 1916; this is the
# subject of another article which she wrote in October 2010.
# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56

# Here is a summary of the three clock change events in Creston's history:
# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
# Exact date unknown
# 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
# Exact date in October unknown; Sunday October 1 is a reasonable guess.
# 3. June 1918: switch to Pacific Daylight Time (GMT-7)
# Exact date in June unknown; Sunday June 2 is a reasonable guess.
# note 1:
# On Oct 27/1918 when daylight saving ended in the rest of Canada,
# Creston did not change its clocks.
# note 2:
# During WWII when the Federal Government legislated a mandatory clock change,
# Creston did not oblige.
# note 3:
# There is no guarantee that Creston will remain on Mountain Standard Time
# (UTC-7) forever.
# The subject was debated at least once this year by the town Council.
# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html

# During a period WWII, summer time (Daylight saying) was mandatory in Canada.
# In Creston, that was handled by shifting the area to PST (-8:00) then applying
# summer time to cause the offset to be -7:00, the same as it had been before
# the change.  It can be argued that the timezone abbreviation during this
# period should be PDT rather than MST, but that doesn't seem important enough
# (to anyone) to further complicate the rules.

# The transition dates (and times) are guesses.

# From Matt Johnson (2015-09-21):
# Fort Nelson, BC, Canada will cancel DST this year.  So while previously they
# were aligned with America/Vancouver, they're now aligned with
# America/Dawson_Creek.
# http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html
#
# From Tim Parenti (2015-09-23):
# This requires a new zone for the Northern Rockies Regional Municipality,
# America/Fort_Nelson.  The resolution of 2014-12-08 was reached following a
# 2014-11-15 poll with nearly 75% support.  Effectively, the municipality has
# been on MST (-0700) like Dawson Creek since it advanced its clocks on
# 2015-03-08.
#
# From Paul Eggert (2015-09-23):
# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Vanc    1918    only    -       Apr     14      2:00    1:00    D
Rule    Vanc    1918    only    -       Oct     27      2:00    0       S
Rule    Vanc    1942    only    -       Feb      9      2:00    1:00    W # War
Rule    Vanc    1945    only    -       Aug     14      23:00u  1:00    P # Peace
Rule    Vanc    1945    only    -       Sep     30      2:00    0       S
Rule    Vanc    1946    1986    -       Apr     lastSun 2:00    1:00    D
Rule    Vanc    1946    only    -       Oct     13      2:00    0       S
Rule    Vanc    1947    1961    -       Sep     lastSun 2:00    0       S
Rule    Vanc    1962    2006    -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Vancouver  -8:12:28 -      LMT     1884
                        -8:00   Vanc    P%sT    1987
                        -8:00   Canada  P%sT
Zone America/Dawson_Creek -8:00:56 -    LMT     1884
                        -8:00   Canada  P%sT    1947
                        -8:00   Vanc    P%sT    1972 Aug 30  2:00
                        -7:00   -       MST
Zone America/Fort_Nelson        -8:10:47 -      LMT     1884
                        -8:00   Vanc    P%sT    1946
                        -8:00   -       PST     1947
                        -8:00   Vanc    P%sT    1987
                        -8:00   Canada  P%sT    2015 Mar  8  2:00
                        -7:00   -       MST
Zone America/Creston    -7:46:04 -      LMT     1884
                        -7:00   -       MST     1916 Oct 1
                        -8:00   -       PST     1918 Jun 2
                        -7:00   -       MST

# Northwest Territories, Nunavut, Yukon

# From Paul Eggert (2006-03-22):
# Dawson switched to PST in 1973.  Inuvik switched to MST in 1979.
# Mathew Englander (1996-10-07) gives the following refs:
#       * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
#       c. 7 defines Yukon standard time as UTC-9....
#       see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
#       [http://canlii.ca/t/7vhg]
#       * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
#       * O.I.C. 1980/02 established DST.
#       * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.

# From Brian Inglis (2015-04-14):
#
# I tried to trace the history of Yukon time and found the following
# regulations, giving the reference title and URL if found, regulation name,
# and relevant quote if available.  Each regulation specifically revokes its
# predecessor.  The final reference is to the current Interpretation Act
# authorizing and resulting from these regulatory changes.
#
# Only recent regulations were retrievable via Yukon government site search or
# index, and only some via Canadian legal sources.  Other sources used include
# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS
# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and
# 1970 quoted below; each article includes current extracts from provincial
# and territorial ST and DST regulations at the end, summaries and details of
# standard times and daylight saving time at many locations across Canada,
# with time zone maps, tables and calculations for Canadian Sunrise, Sunset,
# and LMST; they also cover many countries and global locations, with a chart
# and table showing current Universal Time offsets, and may be useful as
# another source of information for 1970 and earlier.
#
# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26,
#   pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS)
#   http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75:
#   Yukon Interpretation Ordinance
#   Yukon standard time is the local mean time at the one hundred and
#   thirty-fifth meridian.
#
# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.;
#   JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System
#   (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1:
#   Yukon Interpretation Ordinance, 1955, Chap. 16.
#
#     (1) Subject to this section, standard time shall be reckoned as nine
#     hours behind Greenwich Time and called Yukon Standard Time.
#
#     (2) Notwithstanding subsection (1), the Commissioner may make regulations
#     varying the manner of reckoning standard time.
#
# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance
#   http://? - no online source found
#
# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
#   Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
#   http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
#   Territory Commissioner's Order 1967-59 Interpretation Ordinance ...
#
#     1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon
#     Territory on 27th January, 1966, is hereby revoked.
#
#     2. Yukon (East) Standard Time as defined by section 36 of the
#     Interpretation Ordinance from and after mid-night on the 28th day of May,
#     1967 shall be reckoned in the same manner as Pacific Standard Time, that
#     is to say, eight hours behind Greenwich Time in the area of the Yukon
#     Territory lying east of the 138th degree longitude west.
#
#     3. In the remainder of the Territory, lying west of the 138th degree
#     longitude west, Yukon (West) Standard Time shall be reckoned as nine
#     hours behind Greenwich Time.
#
# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214
#   http://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html
#   C.O. 1973/214 INTERPRETATION ACT ...
#
#     1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby
#     revoked.
#
#     2. Yukon Standard Time as defined by section 36 of the Interpretation
#     Act from and after midnight on the twenty-eighth day of October, 1973
#     shall be reckoned in the same manner as Pacific Standard Time, that is
#     to say eight hours behind Greenwich Time.
#
# * O.I.C. 1980/02 INTERPRETATION ACT
#   http://? - no online source found
#
# * Yukon Daylight Saving Time, YOIC 1987/56
#   http://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
#   O.I.C. 1987/056 INTERPRETATION ACT ...
#
#   In every year between
#     (a) two o'clock in the morning in the first Sunday in April, and
#     (b) two o'clock in the morning in the last Sunday in October,
#   Standard Time shall be reckoned as seven hours behind Greenwich Time and
#   called Yukon Daylight Saving Time.
#   ...
#   Dated ... 9th day of March, A.D., 1987.
#
# * Yukon Daylight Saving Time 2006, YOIC 2006/127
#   http://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html
#   O.I.C. 2006/127 INTERPRETATION ACT ...
#
#     1. In Yukon each year the time for general purposes shall be 7 hours
#     behind Greenwich mean time during the period commencing at two o'clock
#     in the forenoon on the second Sunday of March and ending at two o'clock
#     in the forenoon on the first Sunday of November and shall be called
#     Yukon Daylight Saving Time.
#
#     2. Order-in-Council 1987/56 is revoked.
#
#     3. This order comes into force January 1, 2007.
#
# * Interpretation Act, RSY 2002, c 125
# http://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html

# From Rives McDow (1999-09-04):
# Nunavut ... moved ... to incorporate the whole territory into one time zone.
# Nunavut moves to single time zone Oct. 31
# http://www.nunatsiaq.com/nunavut/nvt90903_13.html
#
# From Antoine Leca (1999-09-06):
# We then need to create a new timezone for the Kitikmeot region of Nunavut
# to differentiate it from the Yellowknife region.

# From Paul Eggert (1999-09-20):
# Basic Facts: The New Territory
# http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html
# (1999) reports that Pangnirtung operates on eastern time,
# and that Coral Harbour does not observe DST.  We don't know when
# Pangnirtung switched to eastern time; we'll guess 1995.

# From Rives McDow (1999-11-08):
# On October 31, when the rest of Nunavut went to Central time,
# Pangnirtung wobbled.  Here is the result of their wobble:
#
# The following businesses and organizations in Pangnirtung use Central Time:
#
#       First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
#       Eastern Arctic National Parks, A & D Specialist
#
# The following businesses and organizations in Pangnirtung use Eastern Time:
#
#       Hamlet office, All other businesses, Both schools, Airport operator
#
# This has made for an interesting situation there, which warranted the news.
# No one there that I spoke with seems concerned, or has plans to
# change the local methods of keeping time, as it evidently does not
# really interfere with any activities or make things difficult locally.
# They plan to celebrate New Year's turn-over twice, one hour apart,
# so it appears that the situation will last at least that long.
# The Nunavut Intergovernmental Affairs hopes that they will "come to
# their senses", but the locals evidently don't see any problem with
# the current state of affairs.

# From Michaela Rodrigue, writing in the
# Nunatsiaq News (1999-11-19):
# http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html
# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
# central - or Nunavut time - for government offices, and eastern time
# for municipal offices and schools....  Igloolik [was similar but then]
# made the switch to central time on Saturday, Nov. 6.

# From Paul Eggert (2000-10-02):
# Matthews and Vincent (1998) say the following, but we lack histories
# for these potential new Zones.
#
# The Canadian Forces station at Alert uses Eastern Time while the
# handful of residents at the Eureka weather station [in the Central
# zone] skip daylight savings.  Baffin Island, which is crossed by the
# Central, Eastern and Atlantic Time zones only uses Eastern Time.
# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
# Central Time and Southampton Island [in the Central zone] is not
# required to use daylight savings.

# From <http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html>
# Nunavut now has two time zones (2000-11-10):
# The Nunavut government would allow its employees in Kugluktuk and
# Cambridge Bay to operate on central time year-round, putting them
# one hour behind the rest of Nunavut for six months during the winter.
# At the end of October the two communities had rebelled against
# Nunavut's unified time zone, refusing to shift to eastern time with
# the rest of the territory for the winter.  Cambridge Bay remained on
# central time, while Kugluktuk, even farther west, reverted to
# mountain time, which they had used before the advent of Nunavut's
# unified time zone in 1999.
#
# From Rives McDow (2001-01-20), quoting the Nunavut government:
# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.

# From Paul Eggert (2000-12-04):
# Let's just keep track of the official times for now.

# From Rives McDow (2001-03-07):
# The premier of Nunavut has issued a ministerial statement advising
# that effective 2001-04-01, the territory of Nunavut will revert
# back to three time zones (mountain, central, and eastern).  Of the
# cities in Nunavut, Coral Harbor is the only one that I know of that
# has said it will not observe dst, staying on EST year round.  I'm
# checking for more info, and will get back to you if I come up with
# more.
# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]

# From Gwillim Law (2005-05-21):
# According to ...
# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
# (from a 1998 Canadian Geographic article), the de facto and de jure time
# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
# round.  Using Google, it's easy to find other websites that confirm this.
# I wasn't able to find how far back this time regimen goes, but since it
# predates the creation of Nunavut, it probably goes back many years....
# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
#
# From Paul Eggert (2014-10-17):
# For lack of better information, assume that Southampton Island observed
# daylight saving only during wartime.  Gwillim Law's email also
# mentioned maps now maintained by National Research Council Canada;
# see above for an up-to-date link.

# From Chris Walton (2007-03-01):
# ... the community of Resolute (located on Cornwallis Island in
# Nunavut) moved from Central Time to Eastern Time last November.
# Basically the community did not change its clocks at the end of
# daylight saving....
# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html

# From Chris Walton (2011-03-21):
# Back in 2007 I initiated the creation of a new "zone file" for Resolute
# Bay. Resolute Bay is a small community located about 900km north of
# the Arctic Circle. The zone file was required because Resolute Bay had
# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
#
# According to new information which I received last week, Resolute Bay
# went back to using UTC-6 in the winter of 2007-2008...
#
# On March 11/2007 most of Canada went onto daylight saving. On March
# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
# talked to somebody that was both knowledgeable and helpful. I was able
# to confirm that Resolute Bay was still operating on UTC-5. It was
# explained to me that Resolute Bay had been on the Eastern Time zone
# (EST) in the winter, and was now back on the Central Time zone (CDT).
# i.e. the time zone had changed twice in the last year but the clocks
# had not moved. The residents had to know which time zone they were in
# so they could follow the correct TV schedule...
#
# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
# of the phone call, I decided to seek out an alternate source of
# information. I found an e-mail address for somebody by the name of
# Stephanie Adams whose job was listed as "Inns North Support Officer for
# Arctic Co-operatives." I was under the impression that Stephanie lived
# and worked in Resolute Bay...
#
# On March 14/2011 I phoned the hamlet office again. I was told that
# Resolute Bay had been using Central Standard Time over the winter of
# 2010-2011 and that the clocks had therefore been moved one hour ahead
# on March 13/2011. The person I talked to was aware that Resolute Bay
# had previously experimented with Eastern Standard Time but he could not
# tell me when the practice had stopped.
#
# On March 17/2011 I searched the Web to find an e-mail address of
# somebody that might be able to tell me exactly when Resolute Bay went
# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
# used to be the mayor of Resolute Bay and he apparently owns half the
# businesses including "South Camp Inn." This website has some info on
# Aziz:
# http://www.uphere.ca/node/493
#
# I sent Aziz an e-mail asking when Resolute Bay had stopped using
# Eastern Standard Time.
#
# Aziz responded quickly with this: "hi, The time was not changed for the
# 1 year only, the following year, the community went back to the old way
# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
# the winter Zulu plus 6 hrs"
#
# This of course conflicted with everything I had ascertained in November 2008.
#
# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
# may want to check with the weather office in Resolute Bay or do a
# search on the weather through Env. Canada. web site"
#
# If I had realized the Stephanie did not live in Resolute Bay I would
# never have contacted her.  I now believe that all the information I
# obtained in November 2008 should be ignored...
# I apologize for reporting incorrect information in 2008.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    NT_YK   1918    only    -       Apr     14      2:00    1:00    D
Rule    NT_YK   1918    only    -       Oct     27      2:00    0       S
Rule    NT_YK   1919    only    -       May     25      2:00    1:00    D
Rule    NT_YK   1919    only    -       Nov      1      0:00    0       S
Rule    NT_YK   1942    only    -       Feb      9      2:00    1:00    W # War
Rule    NT_YK   1945    only    -       Aug     14      23:00u  1:00    P # Peace
Rule    NT_YK   1945    only    -       Sep     30      2:00    0       S
Rule    NT_YK   1965    only    -       Apr     lastSun 0:00    2:00    DD
Rule    NT_YK   1965    only    -       Oct     lastSun 2:00    0       S
Rule    NT_YK   1980    1986    -       Apr     lastSun 2:00    1:00    D
Rule    NT_YK   1980    2006    -       Oct     lastSun 2:00    0       S
Rule    NT_YK   1987    2006    -       Apr     Sun>=1  2:00    1:00    D
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
# aka Panniqtuuq
Zone America/Pangnirtung 0      -       -00     1921 # trading post est.
                        -4:00   NT_YK   A%sT    1995 Apr Sun>=1  2:00
                        -5:00   Canada  E%sT    1999 Oct 31  2:00
                        -6:00   Canada  C%sT    2000 Oct 29  2:00
                        -5:00   Canada  E%sT
# formerly Frobisher Bay
Zone America/Iqaluit    0       -       -00     1942 Aug # Frobisher Bay est.
                        -5:00   NT_YK   E%sT    1999 Oct 31  2:00
                        -6:00   Canada  C%sT    2000 Oct 29  2:00
                        -5:00   Canada  E%sT
# aka Qausuittuq
Zone America/Resolute   0       -       -00     1947 Aug 31 # Resolute founded
                        -6:00   NT_YK   C%sT    2000 Oct 29  2:00
                        -5:00   -       EST     2001 Apr  1  3:00
                        -6:00   Canada  C%sT    2006 Oct 29  2:00
                        -5:00   -       EST     2007 Mar 11  3:00
                        -6:00   Canada  C%sT
# aka Kangiqiniq
Zone America/Rankin_Inlet 0     -       -00     1957 # Rankin Inlet founded
                        -6:00   NT_YK   C%sT    2000 Oct 29  2:00
                        -5:00   -       EST     2001 Apr  1  3:00
                        -6:00   Canada  C%sT
# aka Iqaluktuuttiaq
Zone America/Cambridge_Bay 0    -       -00     1920 # trading post est.?
                        -7:00   NT_YK   M%sT    1999 Oct 31  2:00
                        -6:00   Canada  C%sT    2000 Oct 29  2:00
                        -5:00   -       EST     2000 Nov  5  0:00
                        -6:00   -       CST     2001 Apr  1  3:00
                        -7:00   Canada  M%sT
Zone America/Yellowknife 0      -       -00     1935 # Yellowknife founded?
                        -7:00   NT_YK   M%sT    1980
                        -7:00   Canada  M%sT
Zone America/Inuvik     0       -       -00     1953 # Inuvik founded
                        -8:00   NT_YK   P%sT    1979 Apr lastSun  2:00
                        -7:00   NT_YK   M%sT    1980
                        -7:00   Canada  M%sT
Zone America/Whitehorse -9:00:12 -      LMT     1900 Aug 20
                        -9:00   NT_YK   Y%sT    1967 May 28  0:00
                        -8:00   NT_YK   P%sT    1980
                        -8:00   Canada  P%sT
Zone America/Dawson     -9:17:40 -      LMT     1900 Aug 20
                        -9:00   NT_YK   Y%sT    1973 Oct 28  0:00
                        -8:00   NT_YK   P%sT    1980
                        -8:00   Canada  P%sT


###############################################################################

# Mexico

# From Paul Eggert (2014-12-07):
# The Investigation and Analysis Service of the
# Mexican Library of Congress (MLoC) has published a
# history of Mexican local time (in Spanish)
# http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm
#
# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
# (In all cases we go with the MLoC.)
# S&P report that Baja was at -8:00 in 1922/1923.
# S&P say the 1930 transition in Baja was 1930-11-16.
# S&P report no DST during summer 1931.
# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.

# From Gwillim Law (2001-02-20):
# There are some other discrepancies between the Decrees page and the
# tz database.  I think they can best be explained by supposing that
# the researchers who prepared the Decrees page failed to find some of
# the relevant documents.

# From Alan Perry (1996-02-15):
# A guy from our Mexico subsidiary finally found the Presidential Decree
# outlining the timezone changes in Mexico.
#
# ------------- Begin Forwarded Message -------------
#
# I finally got my hands on the Official Presidential Decree that sets up the
# rules for the DST changes. The rules are:
#
# 1. The country is divided in 3 timezones:
#    - Baja California Norte (the Mexico/BajaNorte TZ)
#    - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
#    - The rest of the country (the Mexico/General TZ)
#
# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
#    at 2:00 AM, the times in each zone are as follows:
#    BajaNorte: GMT+7
#    BajaSur:   GMT+6
#    General:   GMT+5
#
# 3. The rest of the year, the times are as follows:
#    BajaNorte: GMT+8
#    BajaSur:   GMT+7
#    General:   GMT+6
#
# The Decree was published in Mexico's Official Newspaper on January 4th.
#
# -------------- End Forwarded Message --------------
# From Paul Eggert (1996-06-12):
# For an English translation of the decree, see
# "Diario Oficial: Time Zone Changeover" (1996-01-04).
# http://mexico-travel.com/extra/timezone_eng.html

# From Rives McDow (1998-10-08):
# The State of Quintana Roo has reverted back to central STD and DST times
# (i.e. UTC -0600 and -0500 as of 1998-08-02).

# From Rives McDow (2000-01-10):
# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
# zone 5 hours from the International Date Line, and will not observe daylight
# savings time so as to stay on the same time zone as the southern part of
# Arizona year round.

# From Jesper Nørgaard, translating
# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
# In Oaxaca, the 55.000 teachers from the Section 22 of the National
# Syndicate of Education Workers, refuse to apply daylight saving each
# year, so that the more than 10,000 schools work at normal hour the
# whole year.

# From Gwillim Law (2001-01-19):
# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
# (translated):...
# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
# that Summer Time will be reduced from seven to five months, starting
# this year....
# http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001
# [translated], says "summer time will ... take effect on the first Sunday
# in May, and end on the last Sunday of September.

# From Arthur David Olson (2001-01-25):
# The 2001-01-24 traditional Washington Post contained the page one
# story "Timely Issue Divides Mexicans."...
# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
# ... Mexico City Mayor López Obrador "...is threatening to keep
# Mexico City and its 20 million residents on a different time than
# the rest of the country..." In particular, López Obrador would abolish
# observation of Daylight Saving Time.

# Official statute published by the Energy Department
# http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre
# (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
# and Sonora with no DST.  This was reported by Jesper Nørgaard (2001-02-03).

# From Paul Eggert (2001-03-03):
#
# http://www.latimes.com/news/nation/20010303/t000018766.html
# James F. Smith writes in today's LA Times
# * Sonora will continue to observe standard time.
# * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that
#   the Federal District will not adopt DST.
# * 4 of 16 district leaders announced they'll ignore the decree.
# * The decree does not affect federal-controlled facilities including
#   the airport, banks, hospitals, and schools.
#
# For now we'll assume that the Federal District will bow to federal rules.

# From Jesper Nørgaard (2001-04-01):
# I found some references to the Mexican application of daylight
# saving, which modifies what I had already sent you, stating earlier
# that a number of northern Mexican states would go on daylight
# saving. The modification reverts this to only cover Baja California
# (Norte), while all other states (except Sonora, who has no daylight
# saving all year) will follow the original decree of president
# Vicente Fox, starting daylight saving May 6, 2001 and ending
# September 30, 2001.
# References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp>
# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)

# From Reuters (2001-09-04):
# Mexico's Supreme Court on Tuesday declared that daylight savings was
# unconstitutional in Mexico City, creating the possibility the
# capital will be in a different time zone from the rest of the nation
# next year....  The Supreme Court's ruling takes effect at 2:00
# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
# standard time. "This is so residents of the Federal District are not
# subject to unexpected time changes," a statement from the court said.

# From Jesper Nørgaard Welen (2002-03-12):
# ... consulting my local grocery store(!) and my coworkers, they all insisted
# that a new decision had been made to reinstate US style DST in Mexico....
# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
# confirms this.  Sonora as usual is the only state where DST is not applied.

# From Steffen Thorsen (2009-12-28):
#
# Steffen Thorsen wrote:
# > Mexico's House of Representatives has approved a proposal for northern
# > Mexico's border cities to share the same daylight saving schedule as
# > the United States.
# Now this has passed both the Congress and the Senate, so starting from
# 2010, some border regions will be the same:
# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
# (Spanish)
#
# Could not find the new law text, but the proposed law text changes are here:
# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
# (Gaceta Parlamentaria)
#
# There is also a list of the votes here:
# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
#
# Our page:
# http://www.timeanddate.com/news/time/north-mexico-dst-change.html

# From Arthur David Olson (2010-01-20):
# The page
# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
# includes this text:
# En los municipios fronterizos de Tijuana y Mexicali en Baja California;
# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
# Tamaulipas, la aplicación de este horario estacional surtirá efecto
# desde las dos horas del segundo domingo de marzo y concluirá a las dos
# horas del primer domingo de noviembre.
# En los municipios fronterizos que se encuentren ubicados en la franja
# fronteriza norte en el territorio comprendido entre la línea
# internacional y la línea paralela ubicada a una distancia de veinte
# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
# interior del país, la aplicación de este horario estacional surtirá
# efecto desde las dos horas del segundo domingo de marzo y concluirá a
# las dos horas del primer domingo de noviembre.

# From Steffen Thorsen (2014-12-08), translated by Gwillim Law:
# The Mexican state of Quintana Roo will likely change to EST in 2015.
#
# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo
# "With this change, the time conflict that has existed between the municipios
# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an
# end. The latter declared itself in rebellion 15 years ago when a time change
# was initiated in Mexico, and since then it has refused to change its time
# zone along with the rest of the country."
#
# From Steffen Thorsen (2015-01-14), translated by Gwillim Law:
# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html
# "...the new time zone will come into effect at two o'clock on the first Sunday
# of February, when we will have to advance the clock one hour from its current
# time..."
# Also, the new zone will not use DST.
#
# From Carlos Raúl Perasso (2015-02-02):
# The decree that modifies the Mexican Hour System Law has finally
# been published at the Diario Oficial de la Federación
# http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015
# It establishes 5 zones for Mexico:
# 1- Zona Centro (Central Zone): Corresponds to longitude 90 W,
#    includes most of Mexico, excluding what's mentioned below.
# 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the
#    states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía
#    de Banderas which lies in Central Zone); Sinaloa and Sonora.
# 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the
#    state of Baja California.
# 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state
#    of Quintana Roo.
# 5- The islands, reefs and keys shall take their timezone from the
#    longitude they are located at.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Mexico  1939    only    -       Feb     5       0:00    1:00    D
Rule    Mexico  1939    only    -       Jun     25      0:00    0       S
Rule    Mexico  1940    only    -       Dec     9       0:00    1:00    D
Rule    Mexico  1941    only    -       Apr     1       0:00    0       S
Rule    Mexico  1943    only    -       Dec     16      0:00    1:00    W # War
Rule    Mexico  1944    only    -       May     1       0:00    0       S
Rule    Mexico  1950    only    -       Feb     12      0:00    1:00    D
Rule    Mexico  1950    only    -       Jul     30      0:00    0       S
Rule    Mexico  1996    2000    -       Apr     Sun>=1  2:00    1:00    D
Rule    Mexico  1996    2000    -       Oct     lastSun 2:00    0       S
Rule    Mexico  2001    only    -       May     Sun>=1  2:00    1:00    D
Rule    Mexico  2001    only    -       Sep     lastSun 2:00    0       S
Rule    Mexico  2002    max     -       Apr     Sun>=1  2:00    1:00    D
Rule    Mexico  2002    max     -       Oct     lastSun 2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
# Quintana Roo; represented by Cancún
Zone America/Cancun     -5:47:04 -      LMT     1922 Jan  1  0:12:56
                        -6:00   -       CST     1981 Dec 23
                        -5:00   Mexico  E%sT    1998 Aug  2  2:00
                        -6:00   Mexico  C%sT    2015 Feb  1  2:00
                        -5:00   -       EST
# Campeche, Yucatán; represented by Mérida
Zone America/Merida     -5:58:28 -      LMT     1922 Jan  1  0:01:32
                        -6:00   -       CST     1981 Dec 23
                        -5:00   -       EST     1982 Dec  2
                        -6:00   Mexico  C%sT
# Coahuila, Nuevo León, Tamaulipas (near US border)
# This includes the following municipalities:
#   in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava,
#     Guerrero, Hidalgo.
#   in Nuevo León: Anáhuac, Los Aldama.
#   in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo,
#     Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros.
# See: Inicia mañana Horario de Verano en zona fronteriza, El Universal,
# 2016-03-12
# http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza
Zone America/Matamoros  -6:40:00 -      LMT     1921 Dec 31 23:20:00
                        -6:00   -       CST     1988
                        -6:00   US      C%sT    1989
                        -6:00   Mexico  C%sT    2010
                        -6:00   US      C%sT
# Durango; Coahuila, Nuevo León, Tamaulipas (away from US border)
Zone America/Monterrey  -6:41:16 -      LMT     1921 Dec 31 23:18:44
                        -6:00   -       CST     1988
                        -6:00   US      C%sT    1989
                        -6:00   Mexico  C%sT
# Central Mexico
Zone America/Mexico_City -6:36:36 -     LMT     1922 Jan  1  0:23:24
                        -7:00   -       MST     1927 Jun 10 23:00
                        -6:00   -       CST     1930 Nov 15
                        -7:00   -       MST     1931 May  1 23:00
                        -6:00   -       CST     1931 Oct
                        -7:00   -       MST     1932 Apr  1
                        -6:00   Mexico  C%sT    2001 Sep 30  2:00
                        -6:00   -       CST     2002 Feb 20
                        -6:00   Mexico  C%sT
# Chihuahua (near US border)
# This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe,
# Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides.
# (See the 2016-03-12 El Universal source mentioned above.)
Zone America/Ojinaga    -6:57:40 -      LMT     1922 Jan  1  0:02:20
                        -7:00   -       MST     1927 Jun 10 23:00
                        -6:00   -       CST     1930 Nov 15
                        -7:00   -       MST     1931 May  1 23:00
                        -6:00   -       CST     1931 Oct
                        -7:00   -       MST     1932 Apr  1
                        -6:00   -       CST     1996
                        -6:00   Mexico  C%sT    1998
                        -6:00   -       CST     1998 Apr Sun>=1  3:00
                        -7:00   Mexico  M%sT    2010
                        -7:00   US      M%sT
# Chihuahua (away from US border)
Zone America/Chihuahua  -7:04:20 -      LMT     1921 Dec 31 23:55:40
                        -7:00   -       MST     1927 Jun 10 23:00
                        -6:00   -       CST     1930 Nov 15
                        -7:00   -       MST     1931 May  1 23:00
                        -6:00   -       CST     1931 Oct
                        -7:00   -       MST     1932 Apr  1
                        -6:00   -       CST     1996
                        -6:00   Mexico  C%sT    1998
                        -6:00   -       CST     1998 Apr Sun>=1  3:00
                        -7:00   Mexico  M%sT
# Sonora
Zone America/Hermosillo -7:23:52 -      LMT     1921 Dec 31 23:36:08
                        -7:00   -       MST     1927 Jun 10 23:00
                        -6:00   -       CST     1930 Nov 15
                        -7:00   -       MST     1931 May  1 23:00
                        -6:00   -       CST     1931 Oct
                        -7:00   -       MST     1932 Apr  1
                        -6:00   -       CST     1942 Apr 24
                        -7:00   -       MST     1949 Jan 14
                        -8:00   -       PST     1970
                        -7:00   Mexico  M%sT    1999
                        -7:00   -       MST

# From Alexander Krivenyshev (2010-04-21):
# According to news, Bahía de Banderas (Mexican state of Nayarit)
# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
# share the same time zone as nearby city Puerto Vallarta, Jalisco).
#
# (Spanish)
# Bahía de Banderas homologa su horario al del centro del
# país, a partir de este domingo
# http://www.nayarit.gob.mx/notes.asp?id=20748
#
# Bahía de Banderas homologa su horario con el del Centro del
# País
# http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50
#
# (English)
# Puerto Vallarta and Bahía de Banderas: One Time Zone
# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
#
# "Mexico's Senate approved the amendments to the Mexican Schedule System that
# will allow Bahía de Banderas and Puerto Vallarta to share the same time
# zone ..."
# Baja California Sur, Nayarit, Sinaloa

# From Arthur David Olson (2010-05-01):
# Use "Bahia_Banderas" to keep the name to fourteen characters.

# Mazatlán
Zone America/Mazatlan   -7:05:40 -      LMT     1921 Dec 31 23:54:20
                        -7:00   -       MST     1927 Jun 10 23:00
                        -6:00   -       CST     1930 Nov 15
                        -7:00   -       MST     1931 May  1 23:00
                        -6:00   -       CST     1931 Oct
                        -7:00   -       MST     1932 Apr  1
                        -6:00   -       CST     1942 Apr 24
                        -7:00   -       MST     1949 Jan 14
                        -8:00   -       PST     1970
                        -7:00   Mexico  M%sT

# Bahía de Banderas
Zone America/Bahia_Banderas     -7:01:00 -      LMT     1921 Dec 31 23:59:00
                        -7:00   -       MST     1927 Jun 10 23:00
                        -6:00   -       CST     1930 Nov 15
                        -7:00   -       MST     1931 May  1 23:00
                        -6:00   -       CST     1931 Oct
                        -7:00   -       MST     1932 Apr  1
                        -6:00   -       CST     1942 Apr 24
                        -7:00   -       MST     1949 Jan 14
                        -8:00   -       PST     1970
                        -7:00   Mexico  M%sT    2010 Apr  4  2:00
                        -6:00   Mexico  C%sT

# Baja California
Zone America/Tijuana    -7:48:04 -      LMT     1922 Jan  1  0:11:56
                        -7:00   -       MST     1924
                        -8:00   -       PST     1927 Jun 10 23:00
                        -7:00   -       MST     1930 Nov 15
                        -8:00   -       PST     1931 Apr  1
                        -8:00   1:00    PDT     1931 Sep 30
                        -8:00   -       PST     1942 Apr 24
                        -8:00   1:00    PWT     1945 Aug 14 23:00u
                        -8:00   1:00    PPT     1945 Nov 12 # Peace
                        -8:00   -       PST     1948 Apr  5
                        -8:00   1:00    PDT     1949 Jan 14
                        -8:00   -       PST     1954
                        -8:00   CA      P%sT    1961
                        -8:00   -       PST     1976
                        -8:00   US      P%sT    1996
                        -8:00   Mexico  P%sT    2001
                        -8:00   US      P%sT    2002 Feb 20
                        -8:00   Mexico  P%sT    2010
                        -8:00   US      P%sT
# From Paul Eggert (2006-03-22):
# Formerly there was an America/Ensenada zone, which differed from
# America/Tijuana only in that it did not observe DST from 1976
# through 1995.  This was as per Shanks (1999).  But Shanks & Pottenger say
# Ensenada did not observe DST from 1948 through 1975.  Guy Harris reports
# that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and
# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
# DST-observance was a town-by-town matter back then.  This concerns
# data after 1970 so most likely there should be at least one Zone
# other than America/Tijuana for Baja, but it's not clear yet what its
# name or contents should be.
#
# From Paul Eggert (2015-10-08):
# Formerly there was an America/Santa_Isabel zone, but this appears to
# have come from a misreading of
# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
# It has been moved to the 'backward' file.
#
#
# Revillagigedo Is
# no information

###############################################################################

# Anguilla
# Antigua and Barbuda
# See America/Port_of_Spain.

# Bahamas
#
# For 1899 Milne gives -5:09:29.5; round that.
#
# From Sue Williams (2006-12-07):
# The Bahamas announced about a month ago that they plan to change their DST
# rules to sync with the U.S. starting in 2007....
# http://www.jonesbahamas.com/?c=45&a=10412

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Bahamas 1964    1975    -       Oct     lastSun 2:00    0       S
Rule    Bahamas 1964    1975    -       Apr     lastSun 2:00    1:00    D
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone    America/Nassau  -5:09:30 -      LMT     1912 Mar 2
                        -5:00   Bahamas E%sT    1976
                        -5:00   US      E%sT

# Barbados

# For 1899 Milne gives -3:58:29.2; round that.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Barb    1977    only    -       Jun     12      2:00    1:00    D
Rule    Barb    1977    1978    -       Oct     Sun>=1  2:00    0       S
Rule    Barb    1978    1980    -       Apr     Sun>=15 2:00    1:00    D
Rule    Barb    1979    only    -       Sep     30      2:00    0       S
Rule    Barb    1980    only    -       Sep     25      2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Barbados   -3:58:29 -      LMT     1924 # Bridgetown
                        -3:58:29 -      BMT     1932 # Bridgetown Mean Time
                        -4:00   Barb    A%sT

# Belize
# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Belize  1918    1942    -       Oct     Sun>=2  0:00    0:30    -0530
Rule    Belize  1919    1943    -       Feb     Sun>=9  0:00    0       CST
Rule    Belize  1973    only    -       Dec      5      0:00    1:00    CDT
Rule    Belize  1974    only    -       Feb      9      0:00    0       CST
Rule    Belize  1982    only    -       Dec     18      0:00    1:00    CDT
Rule    Belize  1983    only    -       Feb     12      0:00    0       CST
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone    America/Belize  -5:52:48 -      LMT     1912 Apr
                        -6:00   Belize  %s

# Bermuda

# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
# Bermuda dockyard, Ireland I; round that.

# From Dan Jones, reporting in The Royal Gazette (2006-06-26):

# Next year, however, clocks in the US will go forward on the second Sunday
# in March, until the first Sunday in November.  And, after the Time Zone
# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
# Friday, the same thing will happen in Bermuda.
# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135

# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone Atlantic/Bermuda   -4:19:18 -      LMT     1930 Jan  1  2:00 # Hamilton
                        -4:00   -       AST     1974 Apr 28  2:00
                        -4:00   Canada  A%sT    1976
                        -4:00   US      A%sT

# Cayman Is
# See America/Panama.

# Costa Rica

# Milne gives -5:36:13.3 as San José mean time; round to nearest.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    CR      1979    1980    -       Feb     lastSun 0:00    1:00    D
Rule    CR      1979    1980    -       Jun     Sun>=1  0:00    0       S
Rule    CR      1991    1992    -       Jan     Sat>=15 0:00    1:00    D
# IATA SSIM (1991-09) says the following was at 1:00;
# go with Shanks & Pottenger.
Rule    CR      1991    only    -       Jul      1      0:00    0       S
Rule    CR      1992    only    -       Mar     15      0:00    0       S
# There are too many San Josés elsewhere, so we'll use 'Costa Rica'.
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Costa_Rica -5:36:13 -      LMT     1890        # San José
                        -5:36:13 -      SJMT    1921 Jan 15 # San José Mean Time
                        -6:00   CR      C%sT
# Coco
# no information; probably like America/Costa_Rica

# Cuba

# From Paul Eggert (2013-02-21):
# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
# for the port, and -5:30 for meteorological observations.
# For now, stick with Shanks & Pottenger.

# From Arthur David Olson (1999-03-29):
# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
# the Cuban National Team and the Baltimore Orioles was carried live on
# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
# During the game, play-by-play announcer Jim Hunter noted that
# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
# Time today."  (The "two hour" remark referred to losing one hour of
# sleep on 1999-03-28 - when the announcers were in Cuba as it switched
# to DST - and one more hour on 1999-04-04 - when the announcers will have
# returned to Baltimore, which switches on that date.)

# From Steffen Thorsen (2013-11-11):
# DST start in Cuba in 2004 ... does not follow the same rules as the
# years before.  The correct date should be Sunday 2004-03-28 00:00 ...
# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html

# From Evert van der Veer via Steffen Thorsen (2004-10-28):
# Cuba is not going back to standard time this year.
# From Paul Eggert (2006-03-22):
# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
# says that it's due to a problem at the Antonio Guiteras
# thermoelectric plant, and says "This October there will be no return
# to normal hours (after daylight saving time)".
# For now, let's assume that it's a temporary measure.

# From Carlos A. Carnero Delgado (2005-11-12):
# This year (just like in 2004-2005) there's no change in time zone
# adjustment in Cuba.  We will stay in daylight saving time:
# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html

# From Jesper Nørgaard Welen (2006-10-21):
# An article in GRANMA INTERNACIONAL claims that Cuba will end
# the 3 years of permanent DST next weekend, see
# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
# watches should be set back one hour - going back to 00:00 hours - returning
# to the normal schedule....

# From Paul Eggert (2007-03-02):
# <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday,
# says Cuban clocks will advance at midnight on March 10.
# For lack of better information, assume Cuba will use US rules,
# except that it switches at midnight standard time as usual.
#
# From Steffen Thorsen (2007-10-25):
# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
# earlier - on the last Sunday of October, just like in 2006.
#
# He supplied these references:
#
# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
#
# From Alex Krivenyshev (2007-10-25):
# Here is also article from Granma (Cuba):
#
# Regirá el Horario Normal desde el próximo domingo 28 de octubre
# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
#
# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html

# From Arthur David Olson (2008-03-09):
# I'm in Maryland which is now observing United States Eastern Daylight
# Time. At 9:44 local time I used RealPlayer to listen to
# http://media.enet.cu/radioreloj
# a Cuban information station, and heard
# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
# indicating that Cuba is still on standard time.

# From Steffen Thorsen (2008-03-12):
# It seems that Cuba will start DST on Sunday, 2007-03-16...
# It was announced yesterday, according to this source (in Spanish):
# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
#
# Some more background information is posted here:
# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
#
# The article also says that Cuba has been observing DST since 1963,
# while Shanks (and tzdata) has 1965 as the first date (except in the
# 1940's). Many other web pages in Cuba also claim that it has been
# observed since 1963, but with the exception of 1970 - an exception
# which is not present in tzdata/Shanks. So there is a chance we need to
# change some historic records as well.
#
# One example:
# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm

# From Jesper Nørgaard Welen (2008-03-13):
# The Cuban time change has just been confirmed on the most authoritative
# web site, the Granma.  Please check out
# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
#
# Basically as expected after Steffen Thorsen's information, the change
# will take place midnight between Saturday and Sunday.

# From Arthur David Olson (2008-03-12):
# Assume Sun>=15 (third Sunday) going forward.

# From Alexander Krivenyshev (2009-03-04)
# According to the Radio Reloj - Cuba will start Daylight Saving Time on
# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
# not on midnight March 14 / March 15 as previously thought.
#
# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
# (in Spanish)

# From Arthur David Olson (2009-03-09)
# I listened over the Internet to
# http://media.enet.cu/readioreloj
# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
# the time was announced as "diez cinco" - the same time as here, indicating
# that has indeed switched to DST. Assume second Sunday from 2009 forward.

# From Steffen Thorsen (2011-03-08):
# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
# this year. Nothing about the end date known so far (if that has
# changed at all).
#
# Source:
# http://granma.co.cu/2011/03/08/nacional/artic01.html
#
# Our info:
# http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
#
# From Steffen Thorsen (2011-10-30)
# Cuba will end DST two weeks later this year. Instead of going back
# tonight, it has been delayed to 2011-11-13 at 01:00.
#
# One source (Spanish)
# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
#
# Our page:
# http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
#
# From Steffen Thorsen (2012-03-01)
# According to Radio Reloj, Cuba will start DST on Midnight between March
# 31 and April 1.
#
# Radio Reloj has the following info (Spanish):
# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
#
# Our info on it:
# http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html

# From Steffen Thorsen (2012-11-03):
# Radio Reloj and many other sources report that Cuba is changing back
# to standard time on 2012-11-04:
# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
# From Paul Eggert (2012-11-03):
# For now, assume the future rule is first Sunday in November.

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Cuba    1928    only    -       Jun     10      0:00    1:00    D
Rule    Cuba    1928    only    -       Oct     10      0:00    0       S
Rule    Cuba    1940    1942    -       Jun     Sun>=1  0:00    1:00    D
Rule    Cuba    1940    1942    -       Sep     Sun>=1  0:00    0       S
Rule    Cuba    1945    1946    -       Jun     Sun>=1  0:00    1:00    D
Rule    Cuba    1945    1946    -       Sep     Sun>=1  0:00    0       S
Rule    Cuba    1965    only    -       Jun     1       0:00    1:00    D
Rule    Cuba    1965    only    -       Sep     30      0:00    0       S
Rule    Cuba    1966    only    -       May     29      0:00    1:00    D
Rule    Cuba    1966    only    -       Oct     2       0:00    0       S
Rule    Cuba    1967    only    -       Apr     8       0:00    1:00    D
Rule    Cuba    1967    1968    -       Sep     Sun>=8  0:00    0       S
Rule    Cuba    1968    only    -       Apr     14      0:00    1:00    D
Rule    Cuba    1969    1977    -       Apr     lastSun 0:00    1:00    D
Rule    Cuba    1969    1971    -       Oct     lastSun 0:00    0       S
Rule    Cuba    1972    1974    -       Oct     8       0:00    0       S
Rule    Cuba    1975    1977    -       Oct     lastSun 0:00    0       S
Rule    Cuba    1978    only    -       May     7       0:00    1:00    D
Rule    Cuba    1978    1990    -       Oct     Sun>=8  0:00    0       S
Rule    Cuba    1979    1980    -       Mar     Sun>=15 0:00    1:00    D
Rule    Cuba    1981    1985    -       May     Sun>=5  0:00    1:00    D
Rule    Cuba    1986    1989    -       Mar     Sun>=14 0:00    1:00    D
Rule    Cuba    1990    1997    -       Apr     Sun>=1  0:00    1:00    D
Rule    Cuba    1991    1995    -       Oct     Sun>=8  0:00s   0       S
Rule    Cuba    1996    only    -       Oct      6      0:00s   0       S
Rule    Cuba    1997    only    -       Oct     12      0:00s   0       S
Rule    Cuba    1998    1999    -       Mar     lastSun 0:00s   1:00    D
Rule    Cuba    1998    2003    -       Oct     lastSun 0:00s   0       S
Rule    Cuba    2000    2003    -       Apr     Sun>=1  0:00s   1:00    D
Rule    Cuba    2004    only    -       Mar     lastSun 0:00s   1:00    D
Rule    Cuba    2006    2010    -       Oct     lastSun 0:00s   0       S
Rule    Cuba    2007    only    -       Mar     Sun>=8  0:00s   1:00    D
Rule    Cuba    2008    only    -       Mar     Sun>=15 0:00s   1:00    D
Rule    Cuba    2009    2010    -       Mar     Sun>=8  0:00s   1:00    D
Rule    Cuba    2011    only    -       Mar     Sun>=15 0:00s   1:00    D
Rule    Cuba    2011    only    -       Nov     13      0:00s   0       S
Rule    Cuba    2012    only    -       Apr     1       0:00s   1:00    D
Rule    Cuba    2012    max     -       Nov     Sun>=1  0:00s   0       S
Rule    Cuba    2013    max     -       Mar     Sun>=8  0:00s   1:00    D

# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone    America/Havana  -5:29:28 -      LMT     1890
                        -5:29:36 -      HMT     1925 Jul 19 12:00 # Havana MT
                        -5:00   Cuba    C%sT

# Dominica
# See America/Port_of_Spain.

# Dominican Republic

# From Steffen Thorsen (2000-10-30):
# Enrique Morales reported to me that the Dominican Republic has changed the
# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
# http://www.listin.com.do/antes/261000/republica/princi.html

# From Paul Eggert (2000-12-04):
# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.

# From Rives McDow (2000-12-01):
# Dominican Republic changed its mind and presidential decree on Tuesday,
# November 28, 2000, with a new decree.  On Sunday, December 3 at 1:00 AM the
# Dominican Republic will be reverting to 8 hours from the International Date
# Line, and will not be using DST in the foreseeable future.  The reason they
# decided to use DST was to be in synch with Puerto Rico, who was also going
# to implement DST.  When Puerto Rico didn't implement DST, the president
# decided to revert.


# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    DR      1966    only    -       Oct     30      0:00    1:00    EDT
Rule    DR      1967    only    -       Feb     28      0:00    0       EST
Rule    DR      1969    1973    -       Oct     lastSun 0:00    0:30    -0430
Rule    DR      1970    only    -       Feb     21      0:00    0       EST
Rule    DR      1971    only    -       Jan     20      0:00    0       EST
Rule    DR      1972    1974    -       Jan     21      0:00    0       EST
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Santo_Domingo -4:39:36 -   LMT     1890
                        -4:40   -       SDMT    1933 Apr  1 12:00 # S. Dom. MT
                        -5:00   DR      %s      1974 Oct 27
                        -4:00   -       AST     2000 Oct 29  2:00
                        -5:00   US      E%sT    2000 Dec  3  1:00
                        -4:00   -       AST

# El Salvador

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Salv    1987    1988    -       May     Sun>=1  0:00    1:00    D
Rule    Salv    1987    1988    -       Sep     lastSun 0:00    0       S
# There are too many San Salvadors elsewhere, so use America/El_Salvador
# instead of America/San_Salvador.
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/El_Salvador -5:56:48 -     LMT     1921 # San Salvador
                        -6:00   Salv    C%sT

# Grenada
# Guadeloupe
# St Barthélemy
# St Martin (French part)
# See America/Port_of_Spain.

# Guatemala
#
# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
# Diario Co Latino, at
# <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>,
# says in an article dated 2006-04-19 that the Guatemalan government had
# decided on that date to advance official time by 60 minutes, to lessen the
# impact of the elevated cost of oil....  Daylight saving time will last from
# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
# From Paul Eggert (2006-06-22):
# The Ministry of Energy and Mines, press release CP-15/2006
# (2006-04-19), says DST ends at 24:00.  See
# http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Guat    1973    only    -       Nov     25      0:00    1:00    D
Rule    Guat    1974    only    -       Feb     24      0:00    0       S
Rule    Guat    1983    only    -       May     21      0:00    1:00    D
Rule    Guat    1983    only    -       Sep     22      0:00    0       S
Rule    Guat    1991    only    -       Mar     23      0:00    1:00    D
Rule    Guat    1991    only    -       Sep      7      0:00    0       S
Rule    Guat    2006    only    -       Apr     30      0:00    1:00    D
Rule    Guat    2006    only    -       Oct      1      0:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Guatemala  -6:02:04 -      LMT     1918 Oct 5
                        -6:00   Guat    C%sT

# Haiti
# From Gwillim Law (2005-04-15):
# Risto O. Nykänen wrote me that Haiti is now on DST.
# I searched for confirmation, and I found a press release
# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
# <http://www.haitianconsulate.org/time.doc>.  Translated from French, it says:
#
#  "The Prime Minister's Communication Office notifies the public in general
#   and the press in particular that, following a decision of the Interior
#   Ministry and the Territorial Collectivities [I suppose that means the
#   provinces], Haiti will move to Eastern Daylight Time in the night from next
#   Saturday the 2nd to Sunday the 3rd.
#
#  "Consequently, the Prime Minister's Communication Office wishes to inform
#   the population that the country's clocks will be set forward one hour
#   starting at midnight.  This provision will hold until the last Saturday in
#   October 2005.
#
#  "Port-au-Prince, March 31, 2005"
#
# From Steffen Thorsen (2006-04-04):
# I have been informed by users that Haiti observes DST this year like
# last year, so the current "only" rule for 2005 might be changed to a
# "max" rule or to last until 2006. (Who knows if they will observe DST
# next year or if they will extend their DST like US/Canada next year).
#
# I have found this article about it (in French):
# http://www.haitipressnetwork.com/news.cfm?articleID=7612
#
# The reason seems to be an energy crisis.

# From Stephen Colebourne (2007-02-22):
# Some IATA info: Haiti won't be having DST in 2007.

# From Steffen Thorsen (2012-03-11):
# According to several news sources, Haiti will observe DST this year,
# apparently using the same start and end date as USA/Canada.
# So this means they have already changed their time.
#
# http://www.alterpresse.org/spip.php?article12510
# http://radiovision2000haiti.net/home/?p=13253
#
# From Arthur David Olson (2012-03-11):
# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
# 3:00 a.m. rather than the traditional Haitian jump at midnight.
# Assume a US-style fall back as well.

# From Steffen Thorsen (2013-03-10):
# It appears that Haiti is observing DST this year as well, same rules
# as US/Canada.  They did it last year as well, and it looks like they
# are going to observe DST every year now...
#
# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
# http://www.canalplushaiti.net/?p=6714

# From Steffen Thorsen (2016-03-12):
# Jean Antoine, editor of www.haiti-reference.com informed us that Haiti
# are not going on DST this year.  Several other resources confirm this: ...
# http://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html
# http://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/
# http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/

# From Steffen Thorsen (2017-03-12):
# We have received 4 mails from different people telling that Haiti
# has started DST again today, and this source seems to confirm that,
# I have not been able to find a more authoritative source:
# https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Haiti   1983    only    -       May     8       0:00    1:00    D
Rule    Haiti   1984    1987    -       Apr     lastSun 0:00    1:00    D
Rule    Haiti   1983    1987    -       Oct     lastSun 0:00    0       S
# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
# Go with IATA.
Rule    Haiti   1988    1997    -       Apr     Sun>=1  1:00s   1:00    D
Rule    Haiti   1988    1997    -       Oct     lastSun 1:00s   0       S
Rule    Haiti   2005    2006    -       Apr     Sun>=1  0:00    1:00    D
Rule    Haiti   2005    2006    -       Oct     lastSun 0:00    0       S
Rule    Haiti   2012    2015    -       Mar     Sun>=8  2:00    1:00    D
Rule    Haiti   2012    2015    -       Nov     Sun>=1  2:00    0       S
Rule    Haiti   2017    max     -       Mar     Sun>=8  2:00    1:00    D
Rule    Haiti   2017    max     -       Nov     Sun>=1  2:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Port-au-Prince -4:49:20 -  LMT     1890
                        -4:49   -       PPMT    1917 Jan 24 12:00 # P-a-P MT
                        -5:00   Haiti   E%sT

# Honduras
# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.

# From Paul Eggert (2006-05-05):
# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
# saying Honduras will start using DST midnight Saturday, effective 4
# months until September.  La Tribuna reported today
# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
# of Honduras, refused to back down on this.

# From Jesper Nørgaard Welen (2006-08-08):
# It seems that Honduras has returned from DST to standard time this Monday at
# 00:00 hours (prolonging Sunday to 25 hours duration).
# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html

# From Paul Eggert (2006-08-08):
# Also see Diario El Heraldo, The country returns to standard time (2006-08-08).
# http://www.elheraldo.hn/nota.php?nid=54941&sec=12
# It mentions executive decree 18-2006.

# From Steffen Thorsen (2006-08-17):
# Honduras will observe DST from 2007 to 2009, exact dates are not
# published, I have located this authoritative source:
# http://www.presidencia.gob.hn/noticia.aspx?nId=47

# From Steffen Thorsen (2007-03-30):
# http://www.laprensahn.com/pais_nota.php?id04962=7386
# So it seems that Honduras will not enter DST this year....

# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Hond    1987    1988    -       May     Sun>=1  0:00    1:00    D
Rule    Hond    1987    1988    -       Sep     lastSun 0:00    0       S
Rule    Hond    2006    only    -       May     Sun>=1  0:00    1:00    D
Rule    Hond    2006    only    -       Aug     Mon>=1  0:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Tegucigalpa -5:48:52 -     LMT     1921 Apr
                        -6:00   Hond    C%sT
#
# Great Swan I ceded by US to Honduras in 1972

# Jamaica
# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
# unspecified official document, and says "This time is used throughout the
# island".  Go with Milne.  Round to the nearest second as required by zic.
#
# Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
# Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
# Assume Neita meant Jan 6 02:00, the same as the US.  Neita also writes that
# Manley's supporters associated this act with Manley's nickname "Joshua"
# (recall that in the Bible the sun stood still at Joshua's request),
# and with the Rod of Correction which Manley said he had received from
# Haile Selassie, Emperor of Ethiopia.  See:
# Neita L. The politician in all of us. Jamaica Observer 2014-09-20
# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
#
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone    America/Jamaica -5:07:11 -      LMT     1890        # Kingston
                        -5:07:11 -      KMT     1912 Feb    # Kingston Mean Time
                        -5:00   -       EST     1974
                        -5:00   US      E%sT    1984
                        -5:00   -       EST

# Martinique
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Martinique -4:04:20 -      LMT     1890        # Fort-de-France
                        -4:04:20 -      FFMT    1911 May    # Fort-de-France MT
                        -4:00   -       AST     1980 Apr  6
                        -4:00   1:00    ADT     1980 Sep 28
                        -4:00   -       AST

# Montserrat
# See America/Port_of_Spain.

# Nicaragua
#
# This uses Shanks & Pottenger for times before 2005.
#
# From Steffen Thorsen (2005-04-12):
# I've got reports from 8 different people that Nicaragua just started
# DST on Sunday 2005-04-10, in order to save energy because of
# expensive petroleum.  The exact end date for DST is not yet
# announced, only "September" but some sites also say "mid-September".
# Some background information is available on the President's official site:
# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
# The Decree, no 23-2005 is available here:
# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
#
# From Paul Eggert (2005-05-01):
# The decree doesn't say anything about daylight saving, but for now let's
# assume that it is daylight saving....
#
# From Gwillim Law (2005-04-21):
# The Associated Press story on the time change, which can be found at
# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
# time that a change of clocks was applied to save energy was in the year 2000
# during the Arnoldo Alemán administration."...
# The northamerica file says that Nicaragua has been on UTC-6 continuously
# since December 1998.  I wasn't able to find any details of Nicaraguan time
# changes in 2000.  Perhaps a note could be added to the northamerica file, to
# the effect that we have indirect evidence that DST was observed in 2000.
#
# From Jesper Nørgaard Welen (2005-11-02):
# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
# (2005-09-26)
#
# From Jesper Nørgaard Welen (2006-05-05):
# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
# (my informal translation)
# By order of the president of the republic, Enrique Bolaños, Nicaragua
# advanced by sixty minutes their official time, yesterday at 2 in the
# morning, and will stay that way until 30th of September.
#
# From Jesper Nørgaard Welen (2006-09-30):
# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
# My informal translation runs:
# The natural sun time is restored in all the national territory, in that the
# time is returned one hour at 01:00 am of October 1 of 2006.
#
# Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
Rule    Nic     1979    1980    -       Mar     Sun>=16 0:00    1:00    D
Rule    Nic     1979    1980    -       Jun     Mon>=23 0:00    0       S
Rule    Nic     2005    only    -       Apr     10      0:00    1:00    D
Rule    Nic     2005    only    -       Oct     Sun>=1  0:00    0       S
Rule    Nic     2006    only    -       Apr     30      2:00    1:00    D
Rule    Nic     2006    only    -       Oct     Sun>=1  1:00    0       S
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone    America/Managua -5:45:08 -      LMT     1890
                        -5:45:12 -      MMT     1934 Jun 23 # Managua Mean Time?
                        -6:00   -       CST     1973 May
                        -5:00   -       EST     1975 Feb 16
                        -6:00   Nic     C%sT    1992 Jan  1  4:00
                        -5:00   -       EST     1992 Sep 24
                        -6:00   -       CST     1993
                        -5:00   -       EST     1997
                        -6:00   Nic     C%sT

# Panama
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone    America/Panama  -5:18:08 -      LMT     1890
                        -5:19:36 -      CMT     1908 Apr 22 # Colón Mean Time
                        -5:00   -       EST
Link America/Panama America/Cayman

# Puerto Rico
# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Puerto_Rico -4:24:25 -     LMT     1899 Mar 28 12:00 # San Juan
                        -4:00   -       AST     1942 May  3
                        -4:00   US      A%sT    1946
                        -4:00   -       AST

# St Kitts-Nevis
# St Lucia
# See America/Port_of_Spain.

# St Pierre and Miquelon
# There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Miquelon   -3:44:40 -      LMT     1911 May 15 # St Pierre
                        -4:00   -       AST     1980 May
                        -3:00   -       -03     1987
                        -3:00   Canada  -03/-02

# St Vincent and the Grenadines
# See America/Port_of_Spain.

# Turks and Caicos
#
# From Chris Dunn in
# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007
# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
# daylight saving dates for time changes have been adjusted to match
# the recent U.S. change of dates.
#
# From Brian Inglis (2007-04-28):
# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
# rows before that there is an out of date entry for Oct:
# "Eastern Standard Times Begins 2007
# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
# indicating that the normal ET rules are followed.
#
# From Paul Eggert (2014-08-19):
# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round.  See:
# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
# Model this as a switch from EST/EDT to AST ...
# From Chris Walton (2014-11-04):
# ... the TCI government appears to have delayed the switch to
# "permanent daylight saving time" by one year....
# http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
#
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Grand_Turk -4:44:32 -      LMT     1890
                        -5:07:11 -      KMT     1912 Feb # Kingston Mean Time
                        -5:00   -       EST     1979
                        -5:00   US      E%sT    2015 Nov Sun>=1 2:00
                        -4:00   -       AST

# British Virgin Is
# Virgin Is
# See America/Port_of_Spain.


# Local Variables:
# coding: utf-8
# End: