| blob | 042be035d701e75b6fb5b631ed4c6c024cafffa0 |
1 # @(#)northamerica 7.40
2 # also includes Central America and the Caribbean
4 # This data is by no means authoritative; if you think you know better,
5 # go ahead and edit the file (and please send any changes to
6 # tz@elsie.nci.nih.gov for general use in the future).
8 # From Paul Eggert <eggert@twinsun.com> (1994-08-17):
9 # A reliable and entertaining source about time zones is
10 # Derek Howse, Greenwich time and the discovery of the longitude,
11 # Oxford University Press (1980).
13 ###############################################################################
15 # United States
17 # From Paul Eggert <eggert@twinsun.com> (1995-12-19):
18 # A good source for time zone historical data in the US is
19 # Thomas G. Shanks, The American Atlas (5th edition),
20 # San Diego: ACS Publications, Inc. (1991).
21 # Make sure you have the errata sheet; the book is somewhat useless without it.
22 # It is the source for the US and Puerto Rico entries below.
24 # From Paul Eggert (1996-06-12):
25 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
26 # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784).
27 # Not everyone is happy with the results:
28 #
29 # I don't really care how time is reckoned so long as there is some
30 # agreement about it, but I object to being told that I am saving
31 # daylight when my reason tells me that I am doing nothing of the kind.
32 # I even object to the implication that I am wasting something
33 # valuable if I stay in bed after the sun has risen. As an admirer
34 # of moonlight I resent the bossy insistence of those who want to
35 # reduce my time for enjoying it. At the back of the Daylight Saving
36 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
37 # to push people into bed earlier, and get them up earlier, to make
38 # them healthy, wealthy and wise in spite of themselves.
39 #
40 # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
42 # From Arthur David Olson:
43 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
44 # See, for example, the front page of the Saturday, 1974-10-26
45 # and Sunday, 1974-10-27 editions of the Washington Post.
47 # From Arthur David Olson:
48 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
49 # Daylight Saving Time in the US was by local option, except during wartime.
51 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
52 Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War
53 Rule US 1918 1919 - Oct lastSun 2:00 0 S
54 Rule US 1942 only - Feb 9 2:00 1:00 W # War
55 Rule US 1945 only - Sep 30 2:00 0 S
56 Rule US 1967 max - Oct lastSun 2:00 0 S
57 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
58 Rule US 1974 only - Jan 6 2:00 1:00 D
59 Rule US 1975 only - Feb 23 2:00 1:00 D
60 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
61 Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
63 # From Bob Devine (1988-01-28):
64 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
65 # old new
66 # Pacific Standard Time(PST) -same-
67 # Yukon Standard Time(YST) -same-
68 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
69 # Nome Standard Time (NT) Bering Standard Time (BST)
70 #
71 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
72 # The YST zone now covers nearly all of the state, AHST just part
73 # of the Aleutian islands. No DST.
75 # From Paul Eggert (1995-12-19):
76 # The tables below use `NST', not `NT', for Nome Standard Time.
77 # I invented `CAWT' for Central Alaska War Time.
79 # From U. S. Naval Observatory (1989-01-19):
80 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
81 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
82 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
83 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
84 # USA MOUNTAIN 7 H BEHIND UTC DENVER
85 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
86 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
87 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
88 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
89 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
90 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
91 # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
92 # USA HAWAII 10 H BEHIND UTC
93 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
95 # From Arthur David Olson (1989-01-21):
96 # The above dates are for 1988.
97 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
98 # no DST in Samoa, and the claim that there is DST in Alaska and the
99 # Aleutians.
101 # From Arthur David Olson (1988-02-13):
102 # Legal standard time zone names, from United States Code (1982 Edition and
103 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
104 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
105 # took effect), as explained in sections 263 and 261:
106 # (none)
107 # United States standard eastern time
108 # United States standard mountain time
109 # United States standard central time
110 # United States standard Pacific time
111 # (none)
112 # United States standard Alaska time
113 # (none)
114 # Next, names from 1967-04-01 until 1983-11-30 (the date for
115 # public law 98-181):
116 # Atlantic standard time
117 # eastern standard time
118 # central standard time
119 # mountain standard time
120 # Pacific standard time
121 # Yukon standard time
122 # Alaska-Hawaii standard time
123 # Bering standard time
124 # And after 1983-11-30:
125 # Atlantic standard time
126 # eastern standard time
127 # central standard time
128 # mountain standard time
129 # Pacific standard time
130 # Alaska standard time
131 # Hawaii-Aleutian standard time
132 # Samoa standard time
133 # The law doesn't give abbreviations.
134 #
135 # From Paul Eggert (1995-12-19):
136 # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
137 # Go with Shanks.
139 # US Eastern time, represented by New York
140 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
141 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
142 Rule NYC 1920 only - Oct lastSun 2:00 0 S
143 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
144 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
145 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
146 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
147 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
148 -5:00 US E%sT 1920
149 -5:00 NYC E%sT 1942
150 -5:00 US E%sT 1946
151 -5:00 NYC E%sT 1967
152 -5:00 US E%sT
154 # US Central time, represented by Chicago
155 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
156 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
157 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
158 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
159 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
160 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
161 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
162 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
163 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
164 -6:00 US C%sT 1920
165 -6:00 Chicago C%sT 1936 Mar 1 2:00
166 -5:00 - EST 1936 Nov 15 2:00
167 -6:00 Chicago C%sT 1942
168 -6:00 US C%sT 1946
169 -6:00 Chicago C%sT 1967
170 -6:00 US C%sT
172 # US Mountain time, represented by Denver
173 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
174 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
175 Rule Denver 1920 only - Oct lastSun 2:00 0 S
176 Rule Denver 1921 only - May 22 2:00 0 S
177 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
178 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
179 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
180 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
181 -7:00 US M%sT 1920
182 -7:00 Denver M%sT 1942
183 -7:00 US M%sT 1946
184 -7:00 Denver M%sT 1967
185 -7:00 US M%sT
187 # US Pacific time, represented by Los Angeles
188 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
189 Rule CA 1948 only - Mar 14 2:00 1:00 D
190 Rule CA 1949 only - Jan 1 2:00 0 S
191 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
192 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
193 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
194 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
195 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
196 -8:00 US P%sT 1946
197 -8:00 CA P%sT 1967
198 -8:00 US P%sT
200 # Alaska
201 # AK%sT is the modern abbreviation for -9:00 per USNO.
202 #
203 # From Paul Eggert (1995-12-19):
204 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
205 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
206 # This was on 1867-10-18. We omit this transition, since we can't represent
207 # changes from Julian to Gregorian.
208 #
209 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
210 Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00
211 -8:00 - PST 1942
212 -8:00 US P%sT 1946
213 -8:00 - PST 1969
214 -8:00 US P%sT 1983 Oct 30 2:00
215 -9:00 US AK%sT
216 Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00
217 -9:00 - YST 1942
218 -9:00 US Y%sT 1946
219 -9:00 - YST 1969
220 -9:00 US Y%sT 1983 Oct 30 2:00
221 -9:00 US AK%sT
222 Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00
223 -10:00 - CAT 1942
224 -10:00 US CAT/CAWT 1946
225 -10:00 - CAT 1967 Apr
226 -10:00 - AHST 1969
227 -10:00 US AH%sT 1983 Oct 30 2:00
228 -9:00 US AK%sT
229 Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00
230 -11:00 - NST 1942
231 -11:00 US N%sT 1946
232 -11:00 - NST 1967 Apr
233 -11:00 - BST 1969
234 -11:00 US B%sT 1983 Oct 30 2:00
235 -9:00 US AK%sT
236 Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00
237 -11:00 - NST 1942
238 -11:00 US N%sT 1946
239 -11:00 - NST 1967 Apr
240 -11:00 - BST 1969
241 -11:00 US B%sT 1983 Oct 30 2:00
242 -10:00 US HA%sT
243 # Shanks writes that part of southwest Alaska (e.g. Aniak)
244 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
245 # and another part (e.g. Akiak) made the same switch five weeks later.
246 # These switches don't quite make our 1970 cutoff.
248 # Hawaii
249 #
250 # From Arthur David Olson:
251 # And then there's Hawaii.
252 # DST was observed for one day in 1933;
253 # standard time was changed by half an hour in 1947;
254 # it's always standard as of 1986.
255 #
256 # From Paul Eggert:
257 # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
258 #
259 Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
260 -10:30 - HST 1933 Apr 30 2:00
261 -10:30 1:00 HDT 1933 May 21 2:00
262 -10:30 US H%sT 1947 Jun 8 2:00
263 -10:00 - HST
265 # Now we turn to US areas that have diverged from the consensus since 1970.
267 # Arizona mostly uses MST.
268 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
269 -7:00 US M%sT 1944 Jan 1 00:01
270 -7:00 - MST 1944 Mar 17 00:01
271 -7:00 US M%sT 1944 Oct 1 00:01
272 -7:00 - MST 1967
273 -7:00 US M%sT 1968
274 -7:00 - MST
275 # From Arthur David Olson (1988-02-13):
276 # A writer from the Inter Tribal Council of Arizona, Inc.,
277 # notes in private correspondence dated 12/28/87 that "Presently, only the
278 # Navajo Nation participates in the Daylight Saving Time policy, due to its
279 # large size and location in three states." (The "only" means that other
280 # tribal nations don't use DST.)
282 Link America/Denver America/Shiprock
284 # Southern Idaho and eastern Oregon switched four weeks late in 1974.
285 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
286 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
287 -8:00 US P%sT 1923 May 13 2:00
288 -7:00 US M%sT 1974
289 -7:00 - MST 1974 Feb 3 2:00
290 -7:00 US M%sT
292 # Indiana
293 #
294 # From Paul Eggert (1995-12-19):
295 # Indiana generally observes either EST all year, or CST/CDT,
296 # but areas near Cincinnati and Louisville use those cities' timekeeping
297 # and in 1969 and 1970 the whole state observed daylight time;
298 # and there are other exceptions as noted below.
299 # Shanks partitions Indiana into 345 regions, each with its own time history,
300 # and writes ``Even newspaper reports present contradictory information.''
301 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
302 #
303 # Since 1970, EST-only Indiana has been like America/Indianapolis,
304 # with exceptions noted below for Crawford, Starke, and Switzerland counties.
305 # The parts of Indiana not listed below have been like America/Chicago,
306 # America/Louisville, or America/New_York.
307 #
308 # Other than Indianapolis, the Indiana place names are so nondescript
309 # that they would be ambiguous if we left them at the `America' level.
310 # So we reluctantly put them all in a subdirectory `America/Indiana'.
311 #
312 # Most of EST-only Indiana last observed DST in 1970.
313 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
314 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
315 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
316 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
317 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
318 Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
319 -6:00 US C%sT 1920
320 -6:00 Indianapolis C%sT 1942
321 -6:00 US C%sT 1946
322 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
323 -5:00 - EST 1957 Sep 29 2:00
324 -6:00 - CST 1958 Apr 27 2:00
325 -5:00 - EST 1969
326 -5:00 US E%sT 1971
327 -5:00 - EST
328 Link America/Indianapolis America/Indiana/Indianapolis
329 #
330 # Part of Crawford County, Indiana, last observed DST in 1975,
331 # and left its clocks alone in 1974.
332 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
333 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
334 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
335 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
336 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
337 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
338 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
339 -6:00 US C%sT 1951
340 -6:00 Marengo C%sT 1961 Apr 30 2:00
341 -5:00 - EST 1969
342 -5:00 US E%sT 1974 Jan 6 2:00
343 -6:00 1:00 CDT 1974 Oct 27 2:00
344 -5:00 US E%sT 1976
345 -5:00 - EST
346 #
347 # Starke County, Indiana
348 # From Arthur David Olson (1991-10-28):
349 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
350 # notes that Starke County switched from Central time to Eastern time as of
351 # 1991-10-27.
352 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
353 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
354 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
355 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
356 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
357 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
358 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
359 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
360 -6:00 US C%sT 1947
361 -6:00 Starke C%sT 1962 Apr 29 2:00
362 -5:00 - EST 1963 Oct 27 2:00
363 -6:00 US C%sT 1991 Oct 27 2:00
364 -5:00 - EST
365 #
366 # Switzerland County, Indiana, last observed DST in 1972.
367 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
368 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
369 -6:00 US C%sT 1954 Apr 25 2:00
370 -5:00 - EST 1969
371 -5:00 US E%sT 1973
372 -5:00 - EST
374 # Part of Kentucky left its clocks alone in 1974.
375 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
376 Rule Louisville 1921 only - May 1 2:00 1:00 D
377 Rule Louisville 1921 only - Sep 1 2:00 0 S
378 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
379 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
380 Rule Louisville 1946 only - Jun 2 2:00 0 S
381 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
382 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
383 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
384 Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
385 -6:00 US C%sT 1921
386 -6:00 Louisville C%sT 1942
387 -6:00 US C%sT 1946
388 -6:00 Louisville C%sT 1961 Jul 23 2:00
389 -5:00 - EST 1968
390 -5:00 US E%sT 1974 Jan 6 2:00
391 -6:00 1:00 CDT 1974 Oct 27 2:00
392 -5:00 US E%sT
394 # Michigan
395 #
396 # From Bob Devine (1988-01-28):
397 # Michigan didn't observe DST from 1968 to 1973.
398 #
399 # From Paul Eggert (1995-12-19):
400 # Shanks writes that Michigan started using standard time on 1885 Sep 18,
401 # but Howse (p 126) writes that Detroit kept
402 #
403 # local time until 1900 when the City Council decreed that clocks should
404 # be put back twenty-eight minutes to Central Standard Time. Half the
405 # city obeyed, half refused. After considerable debate, the decision
406 # was rescinded and the city reverted to Sun time. A derisive offer to
407 # erect a sundial in front of the city hall was referred to the
408 # Committee on Sewers. Then, in 1905, Central time was adopted
409 # by city vote.
410 #
411 # This story is too entertaining to be false, so go with Howse over Shanks.
412 #
413 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
414 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
415 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
416 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
417 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
418 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
419 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
420 Zone America/Detroit -5:32:11 - LMT 1905
421 -6:00 - CST 1915 May 15 2:00
422 -5:00 - EST 1942
423 -5:00 US E%sT 1946
424 -5:00 Detroit E%sT 1973
425 -5:00 US E%sT 1975
426 -5:00 - EST 1975 Apr 27 2:00
427 -5:00 US E%sT
428 #
429 # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
430 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
431 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
432 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
433 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
434 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
435 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
436 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
437 -6:00 US C%sT 1946
438 -6:00 Menominee C%sT 1969 Apr 27 2:00
439 -5:00 - EST 1973 Apr 29 2:00
440 -6:00 US C%sT
442 # Navassa
443 # uninhabited
446 # Old names, for S5 users
448 # Link LINK-FROM LINK-TO
449 Link America/New_York EST5EDT
450 Link America/Chicago CST6CDT
451 Link America/Denver MST7MDT
452 Link America/Los_Angeles PST8PDT
453 Link America/Indianapolis EST
454 Link America/Phoenix MST
455 Link Pacific/Honolulu HST
457 ################################################################################
460 # From Paul Eggert <eggert@twinsun.com> (1996-11-22):
461 # A good source for time zone historical data outside the US is
462 # Thomas G. Shanks, The International Atlas (3rd edition),
463 # San Diego: ACS Publications, Inc. (1991).
464 #
465 # Gwillim Law <LAW@encmail.encompass.com> writes that a good source
466 # for recent time zone data is the International Air Transport
467 # Association's Standard Schedules Information Manual (IATA SSIM),
468 # published semiannually. Law sent in several helpful summaries
469 # of the IATA's data after 1990.
470 #
471 # Except where otherwise noted, Shanks is the source for entries through 1990,
472 # and IATA SSIM is the source for entries after 1990.
473 #
474 # Another source occasionally used is Edward W. Whitman, World Time Differences,
475 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
476 # I found in the UCLA library.
477 #
478 # See the `europe' file for Greenland.
480 # Canada
482 # From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
483 # I post here the time zone abbreviations standardized in Canada
484 # for both English and French in the CAN/CSA-Z234.4-89 standard....
485 #
486 # UTC Standard time Daylight savings time
487 # offset French English French English
488 # -2:30 - - HAT NDT
489 # -3 - - HAA ADT
490 # -3:30 HNT NST - -
491 # -4 HNA AST HAE EDT
492 # -5 HNE EST HAC CDT
493 # -6 HNC CST HAR MDT
494 # -7 HNR MST HAP PDT
495 # -8 HNP PST HAY YDT
496 # -9 HNY YST - -
497 #
498 # HN: Heure Normale ST: Standard Time
499 # HA: Heure Avanc<e'>e DT: Daylight saving Time
500 #
501 # A: de l'Atlantique Atlantic
502 # C: du Centre Central
503 # E: de l'Est Eastern
504 # M: Mountain
505 # N: Newfoundland
506 # P: du Pacifique Pacific
507 # R: des Rocheuses
508 # T: de Terre-Neuve
509 # Y: du Yukon Yukon
510 #
511 # From Paul Eggert <eggert@twinsun.com> (1994-11-22):
512 # Alas, this sort of thing must be handled by localization software.
514 # The data for Canada are all from Shanks (1991).
517 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
518 Rule Canada 1918 only - Apr 14 2:00 1:00 D
519 Rule Canada 1918 only - Oct 31 2:00 0 S
520 Rule Canada 1942 only - Feb 9 2:00 1:00 D
521 Rule Canada 1945 only - Sep 30 2:00 0 S
522 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
523 Rule Canada 1974 max - Oct lastSun 2:00 0 S
524 Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
527 # Newfoundland (except Labrador)
529 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
530 Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
531 Rule StJohns 1917 only - Sep 17 2:00 0 S
532 Rule StJohns 1918 only - Oct 31 2:00 0 S
533 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
534 Rule StJohns 1919 only - May 5 23:00 1:00 D
535 Rule StJohns 1919 only - Aug 12 23:00 0 S
536 # For 1931-1935 Whitman gives Apr same date; go with Shanks.
537 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
538 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
539 # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
540 Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
541 Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
542 # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
543 Rule StJohns 1942 only - Mar 1 0:00 1:00 D
544 Rule StJohns 1942 only - Dec 31 0:00 0 S
545 Rule StJohns 1943 only - May 30 0:00 1:00 D
546 Rule StJohns 1943 only - Sep 5 0:00 0 S
547 Rule StJohns 1944 only - Jul 10 0:00 1:00 D
548 Rule StJohns 1944 only - Sep 2 0:00 0 S
549 Rule StJohns 1945 only - Jan 1 0:00 1:00 D
550 Rule StJohns 1945 only - Oct 7 2:00 0 S
551 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
552 # Apr 30 - Sep 24; go with Shanks.
553 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
554 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
555 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
556 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
557 Rule StJohns 1960 max - Oct lastSun 2:00 0 S
558 Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
559 Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD
560 Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
561 # St John's has an apostrophe, but Posix file names can't have apostrophes.
562 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
563 Zone America/St_Johns -3:30:52 - LMT 1884
564 -3:30:52 StJohns N%sT 1935 Mar 30
565 -3:30 StJohns N%sT
568 # east Labrador
570 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
571 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
572 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
573 -3:30:52 StJohns NST 1919
574 -3:30:52 - NST 1935 Mar 30
575 -3:30 - NST 1936
576 -3:30 StJohns N%sT 1966 Mar 15 2:00
577 -4:00 StJohns A%sT
580 # west Labrador, New Brunswick, Nova Scotia, Prince Edward I
582 # From Paul Eggert (1996-06-12):
583 # Shanks writes that since 1970 most of this region has been like Halifax.
584 # Many locales did not observe peacetime DST until 1972;
585 # Glace Bay, NS is the largest that we know of.
586 # Shanks also writes that Liverpool, NS was the only town in Canada to observe
587 # DST in 1971 but not 1970; for now we'll assume this is a typo.
589 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
590 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
591 Rule Halifax 1916 only - Oct 1 0:00 0 S
592 Rule Halifax 1918 only - Apr 14 2:00 1:00 D
593 Rule Halifax 1918 only - Oct 31 2:00 0 S
594 Rule Halifax 1920 only - May 9 0:00 1:00 D
595 Rule Halifax 1920 only - Aug 29 0:00 0 S
596 Rule Halifax 1921 only - May 6 0:00 1:00 D
597 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
598 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
599 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
600 Rule Halifax 1923 only - Sep 4 0:00 0 S
601 Rule Halifax 1924 only - Sep 15 0:00 0 S
602 Rule Halifax 1925 only - Sep 28 0:00 0 S
603 Rule Halifax 1926 only - May 16 0:00 1:00 D
604 Rule Halifax 1926 only - Sep 13 0:00 0 S
605 Rule Halifax 1927 only - May 1 0:00 1:00 D
606 Rule Halifax 1927 only - Sep 26 0:00 0 S
607 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
608 Rule Halifax 1928 only - Sep 9 0:00 0 S
609 Rule Halifax 1929 only - Sep 3 0:00 0 S
610 Rule Halifax 1930 only - Sep 15 0:00 0 S
611 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
612 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
613 Rule Halifax 1933 only - Oct 2 0:00 0 S
614 Rule Halifax 1934 only - May 20 0:00 1:00 D
615 Rule Halifax 1934 only - Sep 16 0:00 0 S
616 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
617 Rule Halifax 1935 only - Sep 30 0:00 0 S
618 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
619 Rule Halifax 1936 only - Sep 14 0:00 0 S
620 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
621 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
622 Rule Halifax 1939 only - May 28 0:00 1:00 D
623 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
624 Rule Halifax 1942 only - Feb 9 2:00 1:00 D
625 Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
626 Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
627 Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
628 Rule Halifax 1962 max - Oct lastSun 2:00 0 S
629 Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
630 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
631 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
632 -4:00 Halifax A%sT
633 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
634 -4:00 Canada A%sT 1953
635 -4:00 Halifax A%sT 1954
636 -4:00 - AST 1972
637 -4:00 Halifax A%sT
640 # Ontario, Quebec
642 # From Paul Eggert (1996-06-12):
643 # Shanks writes that since 1970 most of this region has been like Montreal.
644 # Thunder Bay skipped DST in 1973.
645 # Many smaller locales did not observe peacetime DST until 1974;
646 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
647 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
649 # From Paul Eggert (1997-10-17):
650 # msb@sq.com writes that an article in the 1997-10-14 Toronto Star
651 # says that Atikokan, Ontario currently does not observe DST,
652 # but will vote on 11-10 whether to use EST/EDT.
653 # He also writes that the
654 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
655 # Ontario Time Act (1990, Chapter T.9)
656 # </a>
657 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
658 # Officially Atikokan is therefore on CST/CDT, and most likely this report
659 # concerns a non-official time observed as a matter of local practice.
660 # For what it's worth, Shanks (1995) says that Atikokan has agreed with
661 # Rainy River ever since standard time was introduced.
663 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
664 Rule Mont 1917 only - Mar 25 2:00 1:00 D
665 Rule Mont 1917 only - Apr 24 0:00 0 S
666 Rule Mont 1918 only - Apr 14 2:00 1:00 D
667 Rule Mont 1918 only - Oct 31 2:00 0 S
668 Rule Mont 1919 only - Mar 31 2:30 1:00 D
669 Rule Mont 1919 only - Oct 25 2:30 0 S
670 Rule Mont 1920 only - May 2 2:30 1:00 D
671 Rule Mont 1920 only - Oct 3 2:30 0 S
672 Rule Mont 1921 only - May 1 2:00 1:00 D
673 Rule Mont 1921 only - Oct 2 2:30 0 S
674 Rule Mont 1922 only - Apr 30 2:00 1:00 D
675 Rule Mont 1922 only - Oct 1 2:30 0 S
676 Rule Mont 1924 only - May 17 2:00 1:00 D
677 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
678 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
679 Rule Mont 1927 only - May 1 0:00 1:00 D
680 Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
681 Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
682 Rule Mont 1932 only - May 1 0:00 1:00 D
683 Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
684 Rule Mont 1933 only - Oct 1 0:00 0 S
685 Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
686 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
687 Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
688 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
689 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
690 Rule Mont 1957 max - Oct lastSun 2:00 0 S
691 Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
692 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
693 Zone America/Montreal -4:54:16 - LMT 1884
694 -5:00 Mont E%sT
695 Zone America/Thunder_Bay -5:57:00 - LMT 1895
696 -5:00 Canada E%sT 1970
697 -5:00 Mont E%sT 1973
698 -5:00 - EST 1974
699 -5:00 Canada E%sT
700 Zone America/Nipigon -5:53:04 - LMT 1895
701 -5:00 Canada E%sT
702 Zone America/Rainy_River -6:17:56 - LMT 1895
703 -6:00 Canada C%sT
706 # Manitoba
708 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
709 Rule Winn 1916 only - Apr 23 0:00 1:00 D
710 Rule Winn 1916 only - Sep 17 0:00 0 S
711 Rule Winn 1918 only - Apr 14 2:00 1:00 D
712 Rule Winn 1918 only - Oct 31 2:00 0 S
713 Rule Winn 1937 only - May 16 2:00 1:00 D
714 Rule Winn 1937 only - Sep 26 2:00 0 S
715 Rule Winn 1942 only - Feb 9 2:00 1:00 D
716 Rule Winn 1945 only - Sep lastSun 2:00 0 S
717 Rule Winn 1946 only - May 12 2:00 1:00 D
718 Rule Winn 1946 only - Oct 13 2:00 0 S
719 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
720 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
721 Rule Winn 1950 only - May 1 2:00 1:00 D
722 Rule Winn 1950 only - Sep 30 2:00 0 S
723 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
724 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
725 Rule Winn 1959 only - Oct lastSun 2:00 0 S
726 Rule Winn 1960 only - Sep lastSun 2:00 0 S
727 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
728 Rule Winn 1963 only - Sep 22 2:00 0 S
729 Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
730 Rule Winn 1966 max - Oct lastSun 2:00 0 S
731 Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
732 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
733 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
734 -6:00 Winn C%sT
737 # Saskatchewan
739 # From Paul Eggert (1996-06-12):
740 # Shanks writes that since 1970 most of this region has been like Regina.
741 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
742 # Other western towns (e.g. Lloydminster) are like Edmonton.
744 # From W. Jones <jones@skdad.usask.ca> (1992-11-06):
745 # The. . .below is based on information I got from our law library, the
746 # provincial archives, and the provincial Community Services department.
747 # A precise history would require digging through newspaper archives, and
748 # since you didn't say what you wanted, I didn't bother.
749 #
750 # Saskatchewan is split by a time zone meridian (105W) and over the years
751 # the boundary became pretty ragged as communities near it reevaluated
752 # their affiliations in one direction or the other. In 1965 a provincial
753 # referendum favoured legislating common time practices.
754 #
755 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
756 # Saskatchewan 1978) was proclaimed, and established that the eastern
757 # part of Saskatchewan would use CST year round, that districts in
758 # northwest Saskatchewan would by default follow CST but could opt to
759 # follow Mountain Time rules (thus 1 hour difference in the winter and
760 # zero in the summer), and that districts in southwest Saskatchewan would
761 # by default follow MT but could opt to follow CST.
762 #
763 # It took a few years for the dust to settle (I know one story of a town
764 # on one time zone having its school in another, such that a mom had to
765 # serve her family lunch in two shifts), but presently it seems that only
766 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
767 # rules any more; all other districts appear to have used CST year round
768 # since sometime in the 1960s.
770 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
771 Rule Regina 1918 only - Apr 14 2:00 1:00 D
772 Rule Regina 1918 only - Oct 31 2:00 0 S
773 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
774 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
775 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
776 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
777 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
778 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
779 Rule Regina 1942 only - Feb 9 2:00 1:00 D
780 Rule Regina 1945 only - Sep lastSun 2:00 0 S
781 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
782 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
783 Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
784 Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
785 Rule Regina 1959 only - Oct lastSun 2:00 0 S
786 #
787 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
788 Rule Swift 1957 only - Oct lastSun 2:00 0 S
789 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
790 Rule Swift 1959 only - Oct lastSun 2:00 0 S
791 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
792 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
793 Zone America/Regina -6:58:36 - LMT 1905 Sep
794 -7:00 Regina M%sT 1960 Apr lastSun 2:00
795 -6:00 - CST
796 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
797 -7:00 Canada M%sT 1946 Apr lastSun 2:00
798 -7:00 Regina M%sT 1950
799 -7:00 Swift M%sT 1972 Apr lastSun 2:00
800 -6:00 - CST
803 # Alberta
805 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
806 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
807 Rule Edm 1918 only - Oct 31 2:00 0 S
808 Rule Edm 1919 only - May 27 2:00 0 S
809 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
810 Rule Edm 1920 only - Oct lastSun 2:00 0 S
811 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
812 Rule Edm 1942 only - Feb 9 2:00 1:00 D
813 Rule Edm 1945 only - Sep lastSun 2:00 0 S
814 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
815 Rule Edm 1947 only - Sep lastSun 2:00 0 S
816 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
817 Rule Edm 1967 only - Oct lastSun 2:00 0 S
818 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
819 Rule Edm 1969 only - Oct lastSun 2:00 0 S
820 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
821 Rule Edm 1972 max - Oct lastSun 2:00 0 S
822 Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
823 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
824 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
825 -7:00 Edm M%sT
828 # British Columbia
830 # From Paul Eggert (1996-06-12):
831 # Shanks writes that since 1970 most of this region has been like Vancouver.
832 # Dawswon Creek uses MST. Much of east BC is like Edmonton.
834 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
835 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
836 Rule Vanc 1918 only - Oct 31 2:00 0 S
837 Rule Vanc 1942 only - Feb 9 2:00 1:00 D
838 Rule Vanc 1945 only - Sep 30 2:00 0 S
839 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
840 Rule Vanc 1946 only - Oct 13 2:00 0 S
841 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
842 Rule Vanc 1962 max - Oct lastSun 2:00 0 S
843 Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
844 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
845 Zone America/Vancouver -8:12:28 - LMT 1884
846 -8:00 Vanc P%sT
847 Zone America/Dawson_Creek -8:00:56 - LMT 1884
848 -8:00 Canada P%sT 1947
849 -8:00 Vanc P%sT 1972 Aug 30 2:00
850 -7:00 - MST
853 # Northwest Territories, Yukon
855 # From Paul Eggert (1996-10-07):
856 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
857 # Shanks's table for Watson Lake is corrupted, so we have no data there.
858 # Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
859 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
860 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
861 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
862 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
863 # * O.I.C. 1980/02 established DST.
864 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
865 # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
867 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
868 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
869 Rule NT_YK 1918 only - Oct 27 2:00 0 S
870 Rule NT_YK 1919 only - May 25 2:00 1:00 D
871 Rule NT_YK 1919 only - Nov 1 0:00 0 S
872 Rule NT_YK 1942 only - Feb 9 2:00 1:00 D
873 Rule NT_YK 1945 only - Sep 30 2:00 0 S
874 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
875 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
876 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
877 Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
878 Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
879 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
880 Zone America/Pangnirtung -4:22:56 - LMT 1884
881 -4:00 NT_YK A%sT
882 Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay
883 -5:00 NT_YK E%sT
884 Zone America/Rankin_Inlet -6:08:40 - LMT 1884
885 -6:00 NT_YK C%sT
886 Zone America/Yellowknife -7:37:24 - LMT 1884
887 -7:00 NT_YK M%sT
888 Zone America/Inuvik -8:54:00 - LMT 1884
889 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
890 -7:00 NT_YK M%sT
891 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
892 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
893 -8:00 NT_YK P%sT
894 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
895 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
896 -8:00 NT_YK P%sT
899 ###############################################################################
901 # Mexico
903 # From Guy Harris:
904 # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
905 # Rules [before] 1987 are unknown.
906 # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
907 # observe DST." This is presumably Baja California Norte, above 28th parallel,
908 # as listed there; [there is also] "Baja California Sur and N. Pacific
909 # Coast (States of Sinaloa and Sonora)."
911 # From Bob Devine (1988-01-28):
912 # The Federal District (where Mexico City is) has observed [DST] several
913 # times but not recently.
914 #
915 # I don't where to drawn the line in the North Baja area. 28th latitude
916 # sounds good -- but it may be higher (how far [d]o radio stations from
917 # San Diego affect culture?).
918 #
919 # The dates of DST probably go back to 1981. The rules are the same as
920 # US's. This is going to be a headache for US presidential electi[o]n years!
922 # From Arthur David Olson (1988-02-13)
923 # Since the 1981 starting date is only "probable," we'll keep the 1987
924 # starting date below.
926 # From U. S. Naval Observatory (1989-01-19):
927 # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
928 # MEXICO BAJA CAL N N. PACIFIC COAST (STATES
929 # MEXICO BAJA CAL N OF SINALOA AND SONORA)
930 # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
931 # MEXICO BAJA CAL N - OCT 29
932 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
933 # MEXICO BAJA CAL N - 0CT 29
934 # MEXICO 6 H BEHIND UTC STATES OF DURANGO,
935 # MEXICO COAHUILA, NUEVO LEON,
936 # MEXICO TAMAULIPAS
937 # MEXICO 5 H BEHIND UTC STATES OF DURANGO,
938 # MEXICO COAHUILA, NUEVO LEON,
939 # MEXICO TAMAULIPAS APR 3 - OCT 29
940 # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
941 # MEXICO CAMPECHE, QUINTANA ROO AND
942 # MEXICO YUCATAN
944 # From Arthur David Olson (1989-01-21):
945 # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
946 # USNO claims there should be four Mexican zones rather than three:
947 # a zone that's GMT-8 with DST; a zone that's always GMT-7;
948 # a zone that's GMT-6 with DST; and a zone that's always GMT-6.
950 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
951 # Shanks also says there are four zones, but disagrees about the fourth.
952 # Instead of GMT-6 with DST, he says there's GMT-8 without DST.
954 # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
955 # A guy from our Mexico subsidiary finally found the Presidential Decree
956 # outlining the timezone changes in Mexico.
957 #
958 # ------------- Begin Forwarded Message -------------
959 #
960 # I finally got my hands on the Official Presidential Decree that sets up the
961 # rules for the DST changes. The rules are:
962 #
963 # 1. The country is divided in 3 timezones:
964 # - Baja California Norte (the Mexico/BajaNorte TZ)
965 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
966 # - The rest of the country (the Mexico/General TZ)
967 #
968 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
969 # at 2:00 AM, the times in each zone are as follows:
970 # BajaNorte: GMT+7
971 # BajaSur: GMT+6
972 # General: GMT+5
973 #
974 # 3. The rest of the year, the times are as follows:
975 # BajaNorte: GMT+8
976 # BajaSur: GMT+7
977 # General: GMT+6
978 #
979 # The Decree was published in Mexico's Official Newspaper on January 4th.
980 #
981 # -------------- End Forwarded Message --------------
982 # From Paul Eggert (1996-06-12):
983 # For an English translation of the decree, see
984 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
985 # ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
986 # </a>
988 # From Shanks (1991):
989 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
990 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
991 Rule Mexico 1939 only - Jun 25 0:00 0 S
992 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
993 Rule Mexico 1941 only - Apr 1 0:00 0 S
994 Rule Mexico 1943 only - Dec 16 0:00 1:00 D
995 Rule Mexico 1944 only - May 1 0:00 0 S
996 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
997 Rule Mexico 1950 only - Jul 30 0:00 0 S
998 Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
999 Rule Mexico 1996 max - Oct lastSun 2:00 0 S
1000 #
1001 Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
1002 Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
1003 Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
1004 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1005 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1006 -7:00 - MST 1927 Jun 10 23:00
1007 -6:00 - CST 1930 Nov 15
1008 -7:00 - MST 1931 May 1 23:00
1009 -6:00 - CST 1931 Oct
1010 -7:00 - MST 1932 Mar 30 23:00
1011 -6:00 Mexico C%sT
1012 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1013 -7:00 - MST 1927 Jun 10 23:00
1014 -6:00 - CST 1930 Nov 15
1015 -7:00 - MST 1931 May 1 23:00
1016 -6:00 - CST 1931 Oct
1017 -7:00 - MST 1932 Mar 30 23:00
1018 -6:00 - CST 1942 Apr
1019 -7:00 - MST 1949 Jan 14
1020 -8:00 - PST 1970
1021 -7:00 Mexico M%sT
1022 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1023 -8:00 - PST 1927 Jun 10 23:00
1024 -7:00 - MST 1930 Nov 16
1025 -8:00 - PST 1942 Apr
1026 -7:00 - MST 1949 Jan 14
1027 -8:00 BajaN P%sT 1967 Apr lastSun 2:00
1028 -8:00 US P%sT 1996
1029 -8:00 Mexico P%sT
1030 Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
1031 -8:00 - PST 1927 Jun 10 23:00
1032 -7:00 - MST 1930 Nov 16
1033 -8:00 - PST 1942 Apr
1034 -7:00 - MST 1949 Jan 14
1035 -8:00 - PST 1996
1036 -8:00 Mexico P%sT
1037 #
1038 # Revillagigedo Is
1039 # no information
1041 ###############################################################################
1043 # Anguilla
1044 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1045 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1046 -4:00 - AST
1048 # Antigua and Barbuda
1049 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1050 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1051 -5:00 - EST 1951
1052 -4:00 - AST
1054 # Bahamas
1055 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1056 Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1057 Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1058 Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1059 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1060 Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1061 -5:00 Bahamas E%sT
1063 # Barbados
1064 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1065 Rule Barb 1977 only - Jun 12 2:00 1:00 D
1066 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1067 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1068 Rule Barb 1979 only - Sep 30 2:00 0 S
1069 Rule Barb 1980 only - Sep 25 2:00 0 S
1070 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1071 Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1072 -3:58 - BMT 1932 # Bridgetown Mean Time
1073 -4:00 Barb A%sT
1075 # Belize
1076 # Whitman entirely disagrees with Shanks; go with Shanks.
1077 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1078 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1079 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1080 Rule Belize 1973 only - Dec 5 0:00 1:00 D
1081 Rule Belize 1974 only - Feb 9 0:00 0 S
1082 Rule Belize 1982 only - Dec 18 0:00 1:00 D
1083 Rule Belize 1983 only - Feb 12 0:00 0 S
1084 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1085 Zone America/Belize -5:52:48 - LMT 1912 Apr
1086 -6:00 Belize C%sT
1088 # Bermuda
1089 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1090 Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1091 -4:00 - AST 1974 Apr 28 2:00
1092 -4:00 Bahamas A%sT
1094 # Cayman Is
1095 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1096 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1097 -5:07 - KMT 1912 Feb # Kingston Mean Time
1098 -5:00 - EST
1100 # Costa Rica
1101 # Shanks gives some very odd dates for 1991, and stops there.
1102 # For now, we won't guess further.
1103 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1104 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1105 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1106 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1107 # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1108 Rule CR 1991 only - Jul 1 0:00 0 S
1109 Rule CR 1992 only - Mar 15 0:00 0 S
1110 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1111 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1112 Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1113 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
1114 -6:00 CR C%sT
1115 # Coco
1116 # no information; probably like America/Costa_Rica
1118 # Cuba
1120 # From Bob Devine (1988-01-28):
1121 # . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
1122 # Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
1123 # (I think).
1125 # From U. S. Naval Observatory (1989-01-19):
1126 # CUBA 5 H BEHIND UTC
1127 # CUBA 4 H BEHIND UTC MAR 20 - OCT 8
1129 # From Shanks (1991):
1130 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1131 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1132 Rule Cuba 1928 only - Oct 10 0:00 0 S
1133 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1134 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1135 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1136 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1137 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1138 Rule Cuba 1965 only - Sep 30 0:00 0 S
1139 Rule Cuba 1966 only - May 29 0:00 1:00 D
1140 Rule Cuba 1966 only - Oct 2 0:00 0 S
1141 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1142 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1143 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1144 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1145 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1146 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1147 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1148 Rule Cuba 1978 only - May 7 0:00 1:00 D
1149 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1150 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1151 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1152 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1153 Rule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D
1154 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1155 Rule Cuba 1996 only - Oct Sun>=1 0:00s 0 S
1156 Rule Cuba 1997 max - Oct Sun>=8 0:00s 0 S
1158 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1159 Zone America/Havana -5:29:28 - LMT 1890
1160 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT
1161 -5:00 Cuba C%sT
1163 # Dominica
1164 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1165 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1166 -4:00 - AST
1168 # Dominican Republic
1169 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1170 Rule DR 1966 only - Oct 30 0:00 1:00 D
1171 Rule DR 1967 only - Feb 28 0:00 0 S
1172 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1173 Rule DR 1970 only - Feb 21 0:00 0 S
1174 Rule DR 1971 only - Jan 20 0:00 0 S
1175 Rule DR 1972 1974 - Jan 21 0:00 0 S
1176 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1177 Zone America/Santo_Domingo -4:39:36 - LMT 1890
1178 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1179 -5:00 DR E%sT 1974 Oct 27
1180 -4:00 - AST
1182 # El Salvador
1183 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1184 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1185 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1186 # There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1187 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1188 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1189 -6:00 Salv C%sT
1191 # Grenada
1192 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1193 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1194 -4:00 - AST
1196 # Guadeloupe
1197 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1198 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1199 -4:00 - AST
1201 # Guatemala
1202 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1203 Rule Guat 1973 only - Nov 25 0:00 1:00 D
1204 Rule Guat 1974 only - Feb 24 0:00 0 S
1205 Rule Guat 1983 only - May 21 0:00 1:00 D
1206 Rule Guat 1983 only - Sep 22 0:00 0 S
1207 Rule Guat 1991 only - Mar 23 0:00 1:00 D
1208 Rule Guat 1991 only - Sep 7 0:00 0 S
1209 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1210 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1211 -6:00 Guat C%sT
1213 # Haiti
1214 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1215 Rule Haiti 1983 only - May 8 0:00 1:00 D
1216 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1217 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1218 # Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA.
1219 Rule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D
1220 Rule Haiti 1988 max - Oct lastSun 1:00s 0 S
1221 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1222 Zone America/Port-au-Prince -4:49:20 - LMT 1890
1223 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1224 -5:00 Haiti E%sT
1226 # Honduras
1227 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1228 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1229 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1230 -6:00 Salv C%sT
1232 # Jamaica
1234 # From Bob Devine (1988-01-28):
1235 # Follows US rules.
1237 # From U. S. Naval Observatory (1989-01-19):
1238 # JAMAICA 5 H BEHIND UTC
1240 # From Shanks (1991):
1241 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1242 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1243 -5:07 - KMT 1912 Feb # Kingston Mean Time
1244 -5:00 - EST 1974 Jan 6 2:00
1245 -5:00 US E%sT 1984
1246 -5:00 - EST
1248 # Martinique
1249 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1250 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1251 -4:04 - FFMT 1911 May # Fort-de-France MT
1252 -4:00 - AST 1980 Apr 6
1253 -4:00 1:00 ADT 1980 Sep 28
1254 -4:00 - AST
1256 # Montserrat
1257 # From Paul Eggert (1997-08-31):
1258 # Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
1259 # Luckily, Olveston, the current de facto capital, has the same longitude.
1260 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1261 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
1262 -4:00 - AST
1264 # Nicaragua
1265 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1266 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1267 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1268 Rule Nic 1992 only - Jan 1 4:00 1:00 D
1269 Rule Nic 1992 only - Sep 24 0:00 0 S
1270 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1271 Zone America/Managua -5:45:08 - LMT 1890
1272 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
1273 -6:00 - CST 1973 May
1274 -5:00 - EST 1975 Feb 16
1275 -6:00 Nic C%sT 1993 Jan 1 4:00
1276 -5:00 - EST
1278 # Panama
1279 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1280 Zone America/Panama -5:18:08 - LMT 1890
1281 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
1282 -5:00 - EST
1284 # Puerto Rico
1285 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1286 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1287 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1288 -4:00 - AST 1942 May 3
1289 -4:00 1:00 AWT 1945 Sep 30 2:00
1290 -4:00 - AST
1292 # St Kitts-Nevis
1293 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1294 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1295 -4:00 - AST
1297 # St Lucia
1298 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1299 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1300 -4:04 - CMT 1912 # Castries Mean Time
1301 -4:00 - AST
1303 # St Pierre and Miquelon
1304 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1305 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1306 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1307 -4:00 - AST 1980 May
1308 -3:00 Mont PM%sT # Pierre & Miquelon Time
1310 # St Vincent and the Grenadines
1311 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1312 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1313 -4:05 - KMT 1912 # Kingstown Mean Time
1314 -4:00 - AST
1316 # Turks and Caicos
1317 # From Paul Eggert (1996-11-22):
1318 # Shanks says they use US DST rules, but IATA SSIM (1991/1996)
1319 # says they switch at midnight. Go with IATA SSIM.
1320 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1321 Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1322 Rule TC 1979 max - Oct lastSun 0:00 0 S
1323 Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1324 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1325 Zone America/Grand_Turk -4:44:32 - LMT 1890
1326 -5:07 - KMT 1912 Feb # Kingston Mean Time
1327 -5:00 TC E%sT
1329 # British Virgin Is
1330 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1331 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1332 -4:00 - AST
1334 # Virgin Is
1335 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1336 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
1337 -4:00 - AST