| blob | 1d0342a568cd7979e349c4c290d7f528c28058c5 |
1 # @(#)northamerica 7.25
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> (August 17, 1994):
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 Arthur David Olson:
25 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
26 # See, for example, the front page of the Saturday, October 26, 1974
27 # and Sunday, October 27, 1974 editions of the Washington Post.
29 # From Arthur David Olson:
30 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
31 # Daylight Saving Time in the US was by local option, except during wartime.
33 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
34 Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War
35 Rule US 1918 1919 - Oct lastSun 2:00 0 S
36 Rule US 1942 only - Feb 9 2:00 1:00 W # War
37 Rule US 1945 only - Sep 30 2:00 0 S
38 Rule US 1967 max - Oct lastSun 2:00 0 S
39 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
40 Rule US 1974 only - Jan 6 2:00 1:00 D
41 Rule US 1975 only - Feb 23 2:00 1:00 D
42 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
43 Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
45 # From Bob Devine (January 28, 1988):
46 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
47 # old new
48 # Pacific Standard Time(PST) -same-
49 # Yukon Standard Time(YST) -same-
50 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
51 # Nome Standard Time (NT) Bering Standard Time (BST)
52 #
53 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
54 # The YST zone now covers nearly all of the state, AHST just part
55 # of the Aleutian islands. No DST.
57 # From Paul Eggert (1995-12-19):
58 # The tables below use `NST', not `NT', for Nome Standard Time.
59 # I invented `CAWT' for Central Alaska War Time.
61 # From U. S. Naval Observatory (January 19, 1989):
62 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
63 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
64 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
65 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
66 # USA MOUNTAIN 7 H BEHIND UTC DENVER
67 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
68 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
69 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
70 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
71 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
72 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
73 # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
74 # USA HAWAII 10 H BEHIND UTC
75 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
77 # From Arthur David Olson (January 21, 1989):
78 # The above dates are for 1988.
79 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
80 # no DST in Samoa, and the claim that there is DST in Alaska and the
81 # Aleutians.
83 # From Arthur David Olson (February 13, 1988):
84 # Legal standard time zone names, from United States Code (1982 Edition and
85 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
86 # up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966
87 # took effect), as explained in sections 263 and 261:
88 # (none)
89 # United States standard eastern time
90 # United States standard mountain time
91 # United States standard central time
92 # United States standard Pacific time
93 # (none)
94 # United States standard Alaska time
95 # (none)
96 # Next, names from April 1, 1967 until November 30, 1983 (the date for
97 # public law 98-181):
98 # Atlantic standard time
99 # eastern standard time
100 # central standard time
101 # mountain standard time
102 # Pacific standard time
103 # Yukon standard time
104 # Alaska-Hawaii standard time
105 # Bering standard time
106 # And after November 30, 1983:
107 # Atlantic standard time
108 # eastern standard time
109 # central standard time
110 # mountain standard time
111 # Pacific standard time
112 # Alaska standard time
113 # Hawaii-Aleutian standard time
114 # Samoa standard time
115 # The law doesn't give abbreviations.
116 #
117 # From Paul Eggert (1995-12-19):
118 # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
119 # Go with Shanks.
121 # US Eastern time, represented by New York
122 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
123 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
124 Rule NYC 1920 only - Oct lastSun 2:00 0 S
125 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
126 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
127 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
128 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
129 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
130 -5:00 US E%sT 1920
131 -5:00 NYC E%sT 1942
132 -5:00 US E%sT 1946
133 -5:00 NYC E%sT 1967
134 -5:00 US E%sT
136 # US Central time, represented by Chicago
137 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
138 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
139 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
140 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
141 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
142 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
143 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
144 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
145 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
146 -6:00 US C%sT 1920
147 -6:00 Chicago C%sT 1936 Mar 1 2:00
148 -5:00 - EST 1936 Nov 15 2:00
149 -6:00 Chicago C%sT 1942
150 -6:00 US C%sT 1946
151 -6:00 Chicago C%sT 1967
152 -6:00 US C%sT
154 # US Mountain time, represented by Denver
155 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
156 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
157 Rule Denver 1920 only - Oct lastSun 2:00 0 S
158 Rule Denver 1921 only - May 22 2:00 0 S
159 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
160 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
161 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
162 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
163 -7:00 US M%sT 1920
164 -7:00 Denver M%sT 1942
165 -7:00 US M%sT 1946
166 -7:00 Denver M%sT 1967
167 -7:00 US M%sT
169 # US Pacific time, represented by Los Angeles
170 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
171 Rule CA 1948 only - Mar 14 2:00 1:00 D
172 Rule CA 1949 only - Jan 1 2:00 0 S
173 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
174 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
175 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
176 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
177 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
178 -8:00 US P%sT 1946
179 -8:00 CA P%sT 1967
180 -8:00 US P%sT
182 # Alaska
183 # AK%sT is the modern abbreviation for -9:00 per USNO.
184 #
185 # From Paul Eggert (1995-12-19):
186 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
187 # and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it
188 # from Russia. We omit this transition, since we can't represent changes
189 # from Julian to Gregorian.
190 #
191 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
192 Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00
193 -8:00 - PST 1942
194 -8:00 US P%sT 1946
195 -8:00 - PST 1969
196 -8:00 US P%sT 1983 Oct 30 2:00
197 -9:00 US AK%sT
198 Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00
199 -9:00 - YST 1942
200 -9:00 US Y%sT 1946
201 -9:00 - YST 1969
202 -9:00 US Y%sT 1983 Oct 30 2:00
203 -9:00 US AK%sT
204 Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00
205 -10:00 - CAT 1942
206 -10:00 US CAT/CAWT 1946
207 -10:00 - CAT 1967 Apr
208 -10:00 - AHST 1969
209 -10:00 US AH%sT 1983 Oct 30 2:00
210 -9:00 US AK%sT
211 Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00
212 -11:00 - NST 1942
213 -11:00 US N%sT 1946
214 -11:00 - NST 1967 Apr
215 -11:00 - BST 1969
216 -11:00 US B%sT 1983 Oct 30 2:00
217 -9:00 US AK%sT
218 Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00
219 -11:00 - NST 1942
220 -11:00 US N%sT 1946
221 -11:00 - NST 1967 Apr
222 -11:00 - BST 1969
223 -11:00 US B%sT 1983 Oct 30 2:00
224 -10:00 US HA%sT
225 # Shanks writes that part of southwest Alaska (e.g. Aniak)
226 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
227 # and another part (e.g. Akiak) made the same switch five weeks later.
228 # These switches don't quite make our 1970 cutoff.
230 # Hawaii
231 #
232 # From Arthur David Olson:
233 # And then there's Hawaii.
234 # DST was observed for one day in 1933;
235 # standard time was changed by half an hour in 1947;
236 # it's always standard as of 1986.
237 #
238 # From Paul Eggert:
239 # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
240 #
241 Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
242 -10:30 - HST 1933 Apr 30 2:00
243 -10:30 1:00 HDT 1933 May 21 2:00
244 -10:30 US H%sT 1947 Jun 8 2:00
245 -10:00 - HST
247 Zone Pacific/Midway -11:49:28 - LMT 1901
248 -11:00 - NST 1967 Apr # N=Nome
249 -11:00 - BST 1983 Nov 30 # B=Bering
250 -11:00 - SST # S=Samoa
252 # Now we turn to US areas that have diverged from the consensus since 1970.
254 # Arizona mostly uses MST.
255 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
256 -7:00 US M%sT 1944 Jan 1 00:01
257 -7:00 - MST 1944 Mar 17 00:01
258 -7:00 US M%sT 1944 Oct 1 00:01
259 -7:00 - MST 1967
260 -7:00 US M%sT 1968
261 -7:00 - MST
262 # From Arthur David Olson (February 13, 1988):
263 # A writer from the Inter Tribal Council of Arizona, Inc.,
264 # notes in private correspondence dated 12/28/87 that "Presently, only the
265 # Navajo Nation participates in the Daylight Saving Time policy, due to its
266 # large size and location in three states." (The "only" means that other
267 # tribal nations don't use DST.)
269 Link America/Denver America/Shiprock
271 # Southern Idaho and eastern Oregon switched four weeks late in 1974.
272 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
273 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
274 -8:00 US P%sT 1923 May 13 2:00
275 -7:00 US M%sT 1974
276 -7:00 - MST 1974 Feb 3 2:00
277 -7:00 US M%sT
279 # Indiana
280 #
281 # From Paul Eggert (1995-12-19):
282 # Indiana generally observes either EST all year, or CST/CDT,
283 # but areas near Cincinnati and Louisville use those cities' timekeeping
284 # and in 1969 and 1970 the whole state observed daylight time;
285 # and there are other exceptions as noted below.
286 # Shanks partitions Indiana into 345 regions, each with its own time history,
287 # and writes ``Even newspaper reports present contradictory information.''
288 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
289 #
290 # Since 1970, EST-only Indiana has been like America/Indianapolis,
291 # with exceptions noted below for Crawford, Starke, and Switzerland counties.
292 # The parts of Indiana not listed below have been like America/Chicago,
293 # America/Louisville, or America/New_York.
294 #
295 # Other than Indianapolis, the Indiana place names are so nondescript
296 # that they would be ambiguous if we left them at the `America' level.
297 # So we reluctantly put them all in a subdirectory `America/Indiana'.
298 #
299 # Most of EST-only Indiana last observed DST in 1970.
300 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
301 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
302 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
303 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
304 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
305 Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
306 -6:00 US C%sT 1920
307 -6:00 Indianapolis C%sT 1942
308 -6:00 US C%sT 1946
309 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
310 -5:00 - EST 1957 Sep 29 2:00
311 -6:00 - CST 1958 Apr 27 2:00
312 -5:00 - EST 1969
313 -5:00 US E%sT 1971
314 -5:00 - EST
315 Link America/Indianapolis America/Indiana/Indianapolis
316 #
317 # Part of Crawford County, Indiana, last observed DST in 1975,
318 # and left its clocks alone in 1974.
319 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
320 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
321 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
322 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
323 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
324 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
325 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
326 -6:00 US C%sT 1951
327 -6:00 Marengo C%sT 1961 Apr 30 2:00
328 -5:00 - EST 1969
329 -5:00 US E%sT 1974 Jan 6 2:00
330 -6:00 1:00 CDT 1974 Oct 27 2:00
331 -5:00 US E%sT 1976
332 -5:00 - EST
333 #
334 # Starke County, Indiana
335 # From Arthur David Olson (October 28, 1991):
336 # An article on page A3 of the Sunday, October 27, 1991 Washington Post
337 # notes that Starke County switched from Central time to Eastern time as of
338 # October 27, 1991.
339 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
340 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
341 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
342 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
343 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
344 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
345 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
346 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
347 -6:00 US C%sT 1947
348 -6:00 Starke C%sT 1962 Apr 29 2:00
349 -5:00 - EST 1963 Oct 27 2:00
350 -6:00 US C%sT 1991 Oct 27 2:00
351 -5:00 - EST
352 #
353 # Switzerland County, Indiana, last observed DST in 1972.
354 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
355 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
356 -6:00 US C%sT 1954 Apr 25 2:00
357 -5:00 - EST 1969
358 -5:00 US E%sT 1973
359 -5:00 - EST
361 # Part of Kentucky left its clocks alone in 1974.
362 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
363 Rule Louisville 1921 only - May 1 2:00 1:00 D
364 Rule Louisville 1921 only - Sep 1 2:00 0 S
365 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
366 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
367 Rule Louisville 1946 only - Jun 2 2:00 0 S
368 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
369 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
370 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
371 Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
372 -6:00 US C%sT 1921
373 -6:00 Louisville C%sT 1942
374 -6:00 US C%sT 1946
375 -6:00 Louisville C%sT 1961 Jul 23 2:00
376 -5:00 - EST 1968
377 -5:00 US E%sT 1974 Jan 6 2:00
378 -6:00 1:00 CDT 1974 Oct 27 2:00
379 -5:00 US E%sT
381 # Michigan
382 #
383 # From Bob Devine (January 28, 1988):
384 # Michigan didn't observe DST from 1968 to 1973.
385 #
386 # From Paul Eggert (1995-12-19):
387 # Shanks writes that Michigan started using standard time on 1885 Sep 18,
388 # but Howse (p 126) writes that Detroit kept
389 #
390 # local time until 1900 when the City Council decreed that clocks should
391 # be put back twenty-eight minutes to Central Standard Time. Half the
392 # city obeyed, half refused. After considerable debate, the decision
393 # was rescinded and the city reverted to Sun time. A derisive offer to
394 # erect a sundial in front of the city hall was referred to the
395 # Committee on Sewers. Then, in 1905, Central time was adopted
396 # by city vote.
397 #
398 # This story is too entertaining to be false, so go with Howse over Shanks.
399 #
400 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
401 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
402 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
403 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
404 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
405 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
406 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
407 Zone America/Detroit -5:32:11 - LMT 1905
408 -6:00 - CST 1915 May 15 2:00
409 -5:00 - EST 1942
410 -5:00 US E%sT 1946
411 -5:00 Detroit E%sT 1973
412 -5:00 US E%sT 1975
413 -5:00 - EST 1975 Apr 27 2:00
414 -5:00 US E%sT
415 #
416 # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
417 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
418 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
419 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
420 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
421 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
422 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
423 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
424 -6:00 US C%sT 1946
425 -6:00 Menominee C%sT 1969 Apr 27 2:00
426 -5:00 - EST 1973 Apr 29 2:00
427 -6:00 US C%sT
429 # Navassa
430 # uninhabited
433 # Old names, for S5 users
435 # Link LINK-FROM LINK-TO
436 Link America/New_York EST5EDT
437 Link America/Chicago CST6CDT
438 Link America/Denver MST7MDT
439 Link America/Los_Angeles PST8PDT
440 Link America/Indianapolis EST
441 Link America/Phoenix MST
442 Link Pacific/Honolulu HST
444 ################################################################################
447 # From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
448 # A good source for time zone historical data outside the US is
449 # Thomas G. Shanks, The International Atlas (3rd edition),
450 # San Diego: ACS Publications, Inc. (1991).
451 # Except where otherwise noted, it is the source for the data below.
452 #
453 # Another source occasionally used is Edward W. Whitman, World Time Differences,
454 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
455 # I found in the UCLA library.
456 #
457 # I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise.
458 # Corrections are welcome!
459 #
460 # See the `europe' file for Greenland.
461 #
462 # See the `africa' file for Zone naming conventions.
464 # Canada
466 # Canada is reportedly lots easier than the US--leastways since 1951.
467 # I don't know what they did before then.
468 # 4.3BSD claims that it's perfectly regular.
469 # According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
470 # on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
471 # "...Canada (well, Ontario and at least some of the other provinces) are
472 # adopting the new daylight savings time rules...". We assume all of
473 # Canada is doing so.
475 # From Bob Devine (January 28, 1988):
476 # All of Canada did have DST from your first rule except Saskatchewan.
477 # Which parts did not observe DST is hard to pinpoint but most of the
478 # province follows the rules.
479 # NOTE: those that didn't have DST for that rule, also
480 # probably did not have it for several years previous.
482 # From U. S. Naval Observatory (January 19, 1989):
483 # CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S
484 # CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29
485 # CANADA ATLANTIC 4 H BEHIND UTC HALIFAX
486 # CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29
487 # CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA
488 # CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29
489 # CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG
490 # CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29
491 # CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON
492 # CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29
493 # CANADA PACIFIC 8 H BEHIND UTC VANCOUVER
494 # CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29
495 # CANADA YUKON SAME AS PACIFIC DAWSON
497 # From Arthur David Olson (January 21, 1989):
498 # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
499 # Note claim that there's double DST in Newfoundland and that Yukon should
500 # be same as Pacific.
502 # From W. Jones (jones@skdad.usask.ca) (November 6, 1992):
503 # The. . .below is based on information I got from our law library, the
504 # provincial archives, and the provincial Community Services department.
505 # A precise history would require digging through newspaper archives, and
506 # since you didn't say what you wanted, I didn't bother.
507 #
508 # Saskatchewan is split by a time zone meridian (105W) and over the years
509 # the boundary became pretty ragged as communities near it reevaluated
510 # their affiliations in one direction or the other. In 1965 a provincial
511 # referendum favoured legislating common time practices.
512 #
513 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
514 # Saskatchewan 1978) was proclaimed, and established that the eastern
515 # part of Saskatchewan would use CST year round, that districts in
516 # northwest Saskatchewan would by default follow CST but could opt to
517 # follow Mountain Time rules (thus 1 hour difference in the winter and
518 # zero in the summer), and that districts in southwest Saskatchewan would
519 # by default follow MT but could opt to follow CST.
520 #
521 # It took a few years for the dust to settle (I know one story of a town
522 # on one time zone having its school in another, such that a mom had to
523 # serve her family lunch in two shifts), but presently it seems that only
524 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
525 # rules any more; all other districts appear to have used CST year round
526 # since sometime in the 1960s.
527 #
528 # Here's how I would summarize things. Establish a "Saskatchewan" CST
529 # time zone, and note that it officially exists as of 15 April 1966. Any
530 # current exceptions can put themselves in the "Mountain" zone, since
531 # those are the rules they follow. Any past exceptions can be forgotten,
532 # since that's what those who live here have done.
534 # From Arthur David Olson (November 21, 1992):
535 # East-Saskatchewan kept to avoid problems for folks using that zone by name;
536 # plain Saskatchewan added.
538 # From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
539 # I post here the time zone abbreviations standardized in Canada
540 # for both English and French in the CAN/CSA-Z234.4-89 standard....
541 #
542 # UTC Standard time Daylight savings time
543 # offset French English French English
544 # -2:30 - - HAT NDT
545 # -3 - - HAA ADT
546 # -3:30 HNT NST - -
547 # -4 HNA AST HAE EDT
548 # -5 HNE EST HAC CDT
549 # -6 HNC CST HAR MDT
550 # -7 HNR MST HAP PDT
551 # -8 HNP PST HAY YDT
552 # -9 HNY YST - -
553 #
554 # HN: Heure Normale ST: Standard Time
555 # HA: Heure Avanc<e'>e DT: Daylight saving Time
556 #
557 # A: de l'Atlantique Atlantic
558 # C: du Centre Central
559 # E: de l'Est Eastern
560 # M: Mountain
561 # N: Newfoundland
562 # P: du Pacifique Pacific
563 # R: des Rocheuses
564 # T: de Terre-Neuve
565 # Y: du Yukon Yukon
566 #
567 # From Paul Eggert <eggert@twinsun.com> (1994-11-22):
568 # Alas, this sort of thing must be handled by localization software.
570 # From Shanks (1991):
571 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
572 Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
573 Rule StJohns 1917 only - Sep 17 2:00 0 S
574 Rule StJohns 1918 only - Oct 31 2:00 0 S
575 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
576 Rule StJohns 1919 only - May 5 23:00 1:00 D
577 Rule StJohns 1919 only - Aug 12 23:00 0 S
578 # For 1931-1935 Whitman gives Apr same date; go with Shanks.
579 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
580 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
581 # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
582 Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
583 Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
584 # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
585 Rule StJohns 1942 only - Mar 1 0:00 1:00 D
586 Rule StJohns 1942 only - Dec 31 0:00 0 S
587 Rule StJohns 1943 only - May 30 0:00 1:00 D
588 Rule StJohns 1943 only - Sep 5 0:00 0 S
589 Rule StJohns 1944 only - Jul 10 0:00 1:00 D
590 Rule StJohns 1944 only - Sep 2 0:00 0 S
591 Rule StJohns 1945 only - Jan 1 0:00 1:00 D
592 Rule StJohns 1945 only - Oct 7 2:00 0 S
593 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
594 # Apr 30 - Sep 24; go with Shanks.
595 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
596 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
597 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
598 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
599 Rule StJohns 1960 max - Oct lastSun 2:00 0 S
600 Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
601 Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD
602 Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
603 # St John's has an apostrophe, but Posix file names can't have apostrophes.
604 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
605 Zone America/St_Johns -3:30:52 - LMT 1884
606 -3:31 StJohns N%sT 1935 Mar 30
607 -3:30 StJohns N%sT
609 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
610 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
611 Rule Halifax 1916 only - Oct 1 0:00 0 S
612 Rule Halifax 1918 only - Apr 14 2:00 1:00 D
613 Rule Halifax 1918 only - Oct 31 2:00 0 S
614 Rule Halifax 1920 only - May 9 0:00 1:00 D
615 Rule Halifax 1920 only - Aug 29 0:00 0 S
616 Rule Halifax 1921 only - May 6 0:00 1:00 D
617 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
618 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
619 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
620 Rule Halifax 1923 only - Sep 4 0:00 0 S
621 Rule Halifax 1924 only - Sep 15 0:00 0 S
622 Rule Halifax 1925 only - Sep 28 0:00 0 S
623 Rule Halifax 1926 only - May 16 0:00 1:00 D
624 Rule Halifax 1926 only - Sep 13 0:00 0 S
625 Rule Halifax 1927 only - May 1 0:00 1:00 D
626 Rule Halifax 1927 only - Sep 26 0:00 0 S
627 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
628 Rule Halifax 1928 only - Sep 9 0:00 0 S
629 Rule Halifax 1929 only - Sep 3 0:00 0 S
630 Rule Halifax 1930 only - Sep 15 0:00 0 S
631 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
632 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
633 Rule Halifax 1933 only - Oct 2 0:00 0 S
634 Rule Halifax 1934 only - May 20 0:00 1:00 D
635 Rule Halifax 1934 only - Sep 16 0:00 0 S
636 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
637 Rule Halifax 1935 only - Sep 30 0:00 0 S
638 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
639 Rule Halifax 1936 only - Sep 14 0:00 0 S
640 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
641 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
642 Rule Halifax 1939 only - May 28 0:00 1:00 D
643 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
644 Rule Halifax 1942 only - Feb 9 2:00 1:00 D
645 Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
646 Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
647 Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
648 Rule Halifax 1962 max - Oct lastSun 2:00 0 S
649 Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
650 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
651 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
652 -4:00 Halifax A%sT
654 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
655 Rule Mont 1917 only - Mar 25 2:00 1:00 D
656 Rule Mont 1917 only - Apr 24 0:00 0 S
657 Rule Mont 1918 only - Apr 14 2:00 1:00 D
658 Rule Mont 1918 only - Oct 31 2:00 0 S
659 Rule Mont 1919 only - Mar 31 2:30 1:00 D
660 Rule Mont 1919 only - Oct 25 2:30 0 S
661 Rule Mont 1920 only - May 2 2:30 1:00 D
662 Rule Mont 1920 only - Oct 3 2:30 0 S
663 Rule Mont 1921 only - May 1 2:00 1:00 D
664 Rule Mont 1921 only - Oct 2 2:30 0 S
665 Rule Mont 1922 only - Apr 30 2:00 1:00 D
666 Rule Mont 1922 only - Oct 1 2:30 0 S
667 Rule Mont 1924 only - May 17 2:00 1:00 D
668 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
669 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
670 Rule Mont 1927 only - May 1 0:00 1:00 D
671 Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
672 Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
673 Rule Mont 1932 only - May 1 0:00 1:00 D
674 Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
675 Rule Mont 1933 only - Oct 1 0:00 0 S
676 Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
677 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
678 Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
679 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
680 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
681 Rule Mont 1957 max - Oct lastSun 2:00 0 S
682 Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
683 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
684 Zone America/Montreal -4:54:16 - LMT 1884
685 -5:00 Mont E%sT
687 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
688 Rule Winn 1916 only - Apr 23 0:00 1:00 D
689 Rule Winn 1916 only - Sep 17 0:00 0 S
690 Rule Winn 1918 only - Apr 14 2:00 1:00 D
691 Rule Winn 1918 only - Oct 31 2:00 0 S
692 Rule Winn 1937 only - May 16 2:00 1:00 D
693 Rule Winn 1937 only - Sep 26 2:00 0 S
694 Rule Winn 1942 only - Feb 9 2:00 1:00 D
695 Rule Winn 1945 only - Sep lastSun 2:00 0 S
696 Rule Winn 1946 only - May 12 2:00 1:00 D
697 Rule Winn 1946 only - Oct 13 2:00 0 S
698 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
699 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
700 Rule Winn 1950 only - May 1 2:00 1:00 D
701 Rule Winn 1950 only - Sep 30 2:00 0 S
702 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
703 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
704 Rule Winn 1959 only - Oct lastSun 2:00 0 S
705 Rule Winn 1960 only - Sep lastSun 2:00 0 S
706 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
707 Rule Winn 1963 only - Sep 22 2:00 0 S
708 Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
709 Rule Winn 1966 max - Oct lastSun 2:00 0 S
710 Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
711 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
712 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
713 -6:00 Winn C%sT
715 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
716 Rule Regina 1918 only - Apr 14 2:00 1:00 D
717 Rule Regina 1918 only - Oct 31 2:00 0 S
718 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
719 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
720 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
721 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
722 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
723 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
724 Rule Regina 1942 only - Feb 9 2:00 1:00 D
725 Rule Regina 1945 only - Sep lastSun 2:00 0 S
726 Rule Regina 1946 only - Apr 14 2:00 1:00 D
727 Rule Regina 1946 only - Oct 13 2:00 0 S
728 Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D
729 Rule Regina 1947 1959 - Sep lastSun 2:00 0 S
730 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
731 Zone America/Regina -6:58:36 - LMT 1905 Sep
732 -7:00 Regina M%sT 1966 Apr 15
733 -6:00 - CST
735 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
736 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
737 Rule Edm 1918 only - Oct 31 2:00 0 S
738 Rule Edm 1919 only - May 27 2:00 0 S
739 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
740 Rule Edm 1920 only - Oct lastSun 2:00 0 S
741 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
742 Rule Edm 1942 only - Feb 9 2:00 1:00 D
743 Rule Edm 1945 only - Sep lastSun 2:00 0 S
744 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
745 Rule Edm 1947 only - Sep lastSun 2:00 0 S
746 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
747 Rule Edm 1967 only - Oct lastSun 2:00 0 S
748 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
749 Rule Edm 1969 only - Oct lastSun 2:00 0 S
750 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
751 Rule Edm 1972 max - Oct lastSun 2:00 0 S
752 Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
753 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
754 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
755 -7:00 Edm M%sT
757 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
758 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
759 Rule Vanc 1918 only - Oct 31 2:00 0 S
760 Rule Vanc 1942 only - Feb 9 2:00 1:00 D
761 Rule Vanc 1945 only - Sep 30 2:00 0 S
762 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
763 Rule Vanc 1946 only - Oct 13 2:00 0 S
764 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
765 Rule Vanc 1962 max - Oct lastSun 2:00 0 S
766 Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
767 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
768 Zone America/Vancouver -8:12:28 - LMT 1884
769 -8:00 Vanc P%sT
771 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
772 Rule Yukon 1918 only - Apr 14 2:00 1:00 D
773 Rule Yukon 1918 only - Oct 27 2:00 0 S
774 Rule Yukon 1919 only - May 25 2:00 1:00 D
775 Rule Yukon 1919 only - Nov 1 0:00 0 S
776 Rule Yukon 1942 only - Feb 9 2:00 1:00 D
777 Rule Yukon 1965 only - Apr 25 0:00 1:00 D
778 Rule Yukon 1965 only - Oct 31 2:00 0 S
779 Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D
780 Rule Yukon 1980 max - Oct lastSun 2:00 0 S
781 Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D
782 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
783 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
784 -9:00 Yukon Y%sT 1966 Jul
785 -8:00 Yukon P%sT
786 # Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28.
788 ###############################################################################
790 # Mexico
792 # From Guy Harris:
793 # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
794 # Rules prior to 1987 are unknown.
795 # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
796 # observe DST." This is presumably Baja California Norte, above 28th parallel,
797 # as listed there; [there is also] "Baja California Sur and N. Pacific
798 # Coast (States of Sinaloa and Sonora)."
800 # From Bob Devine (January 28, 1988):
801 # The Federal District (where Mexico City is) has observed [DST] several
802 # times but not recently.
803 #
804 # I don't where to drawn the line in the North Baja area. 28th latitude
805 # sounds good -- but it may be higher (how far [d]o radio stations from
806 # San Diego affect culture?).
807 #
808 # The dates of DST probably go back to 1981. The rules are the same as
809 # US's. This is going to be a headache for US presidential electi[o]n years!
811 # From Arthur David Olson (February 13, 1988)
812 # Since the 1981 starting date is only "probable," we'll keep the 1987
813 # starting date below.
815 # From U. S. Naval Observatory (January 19, 1989):
816 # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
817 # MEXICO BAJA CAL N N. PACIFIC COAST (STATES
818 # MEXICO BAJA CAL N OF SINALOA AND SONORA)
819 # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
820 # MEXICO BAJA CAL N - OCT 29
821 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
822 # MEXICO BAJA CAL N - 0CT 29
823 # MEXICO 6 H BEHIND UTC STATES OF DURANGO,
824 # MEXICO COAHUILA, NUEVO LEON,
825 # MEXICO TAMAULIPAS
826 # MEXICO 5 H BEHIND UTC STATES OF DURANGO,
827 # MEXICO COAHUILA, NUEVO LEON,
828 # MEXICO TAMAULIPAS APR 3 - OCT 29
829 # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
830 # MEXICO CAMPECHE, QUINTANA ROO AND
831 # MEXICO YUCATAN
833 # From Arthur David Olson (January 21, 1989):
834 # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
835 # USNO claims there should be four Mexican zones rather than three:
836 # a zone that's GMT-8 with DST; a zone that's always GMT-7;
837 # a zone that's GMT-6 with DST; and a zone that's always GMT-6.
839 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
840 # Shanks also says there are four zones, but disagrees about the fourth.
841 # Instead of GMT-6 with DST, he says there's GMT-8 without DST.
843 # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
844 # A guy from our Mexico subsidiary finally found the Presidential Decree
845 # outlining the timezone changes in Mexico.
846 #
847 # ------------- Begin Forwarded Message -------------
848 #
849 # I finally got my hands on the Official Presidential Decree that sets up the
850 # rules for the DST changes. The rules are:
851 #
852 # 1. The country is divided in 3 timezones:
853 # - Baja California Norte (the Mexico/BajaNorte TZ)
854 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
855 # - The rest of the country (the Mexico/General TZ)
856 #
857 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
858 # at 2:00 AM, the times in each zone are as follows:
859 # BajaNorte: GMT+7
860 # BajaSur: GMT+6
861 # General: GMT+5
862 #
863 # 3. The rest of the year, the times are as follows:
864 # BajaNorte: GMT+8
865 # BajaSur: GMT+7
866 # General: GMT+6
867 #
868 # The Decree was published in Mexico's Official Newspaper on January 4th.
869 #
870 # -------------- End Forwarded Message --------------
872 # From Shanks (1991):
873 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
874 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
875 Rule Mexico 1939 only - Jun 25 0:00 0 S
876 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
877 Rule Mexico 1941 only - Apr 1 0:00 0 S
878 Rule Mexico 1943 only - Dec 16 0:00 1:00 D
879 Rule Mexico 1944 only - May 1 0:00 0 S
880 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
881 Rule Mexico 1950 only - Jul 30 0:00 0 S
882 Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
883 Rule Mexico 1996 max - Oct lastSun 2:00 0 S
884 #
885 Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
886 Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
887 Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
888 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
889 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
890 -7:00 - MST 1927 Jun 10 23:00
891 -6:00 - CST 1930 Nov 15
892 -7:00 - MST 1931 May 1 23:00
893 -6:00 - CST 1931 Oct
894 -7:00 - MST 1932 Mar 30 23:00
895 -6:00 Mexico C%sT
896 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
897 -7:00 - MST 1927 Jun 10 23:00
898 -6:00 - CST 1930 Nov 15
899 -7:00 - MST 1931 May 1 23:00
900 -6:00 - CST 1931 Oct
901 -7:00 - MST 1932 Mar 30 23:00
902 -6:00 - CST 1942 Apr
903 -7:00 - MST 1949 Jan 14
904 -8:00 - PST 1970
905 -7:00 Mexico M%sT
906 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
907 -8:00 - PST 1927 Jun 10 23:00
908 -7:00 - MST 1930 Nov 16
909 -8:00 - PST 1942 Apr
910 -7:00 - MST 1949 Jan 14
911 -8:00 BajaN P%sT 1967 Apr lastSun 2:00
912 -8:00 US P%sT 1996
913 -8:00 Mexico P%sT
914 Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
915 -8:00 - PST 1927 Jun 10 23:00
916 -7:00 - MST 1930 Nov 16
917 -8:00 - PST 1942 Apr
918 -7:00 - MST 1949 Jan 14
919 -8:00 - PST 1996
920 -8:00 Mexico P%sT
921 #
922 # Revillagigedo Is
923 # no information
925 ###############################################################################
927 # Anguilla
928 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
929 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
930 -4:00 - AST
932 # Antigua and Barbuda
933 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
934 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
935 -5:00 - EST 1951
936 -4:00 - AST
938 # Bahamas
939 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
940 Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
941 Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
942 Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
943 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
944 Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
945 -5:00 Bahamas E%sT
947 # Barbados
948 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
949 Rule Barb 1977 only - Jun 12 2:00 1:00 D
950 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
951 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
952 Rule Barb 1979 only - Sep 30 2:00 0 S
953 Rule Barb 1980 only - Sep 25 2:00 0 S
954 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
955 Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
956 -3:58 - BMT 1932 # Bridgetown Mean Time
957 -4:00 Barb A%sT
959 # Belize
960 # Whitman entirely disagrees with Shanks; go with Shanks.
961 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
962 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
963 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
964 Rule Belize 1973 only - Dec 5 0:00 1:00 D
965 Rule Belize 1974 only - Feb 9 0:00 0 S
966 Rule Belize 1982 only - Dec 18 0:00 1:00 D
967 Rule Belize 1983 only - Feb 12 0:00 0 S
968 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
969 Zone America/Belize -5:52:48 - LMT 1912 Apr
970 -6:00 Belize C%sT
972 # Bermuda
973 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
974 Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
975 -4:00 - AST 1974 Apr 28 2:00
976 -4:00 Bahamas A%sT
978 # Cayman Is
979 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
980 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
981 -5:07 - KMT 1912 Feb # Kingston Mean Time
982 -5:00 - EST
984 # Clipperton
985 # uninhabited
987 # Costa Rica
988 # Shanks gives some very odd dates for 1991, and stops there.
989 # For now, we won't guess further.
990 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
991 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
992 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
993 Rule CR 1991 only - Jan 19 0:00 1:00 D
994 Rule CR 1991 only - Jul 1 0:00 0 S
995 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
996 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
997 Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
998 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
999 -6:00 CR C%sT
1000 # Coco
1001 # no information; probably like America/Costa_Rica
1003 # Cuba
1005 # From Bob Devine (January 28, 1988):
1006 # . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
1007 # Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
1008 # (I think).
1010 # From U. S. Naval Observatory (January 19, 1989):
1011 # CUBA 5 H BEHIND UTC
1012 # CUBA 4 H BEHIND UTC MAR 20 - OCT 8
1014 # From Shanks (1991):
1015 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1016 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1017 Rule Cuba 1928 only - Oct 10 0:00 0 S
1018 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1019 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1020 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1021 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1022 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1023 Rule Cuba 1965 only - Sep 30 0:00 0 S
1024 Rule Cuba 1966 only - May 29 0:00 1:00 D
1025 Rule Cuba 1966 only - Oct 2 0:00 0 S
1026 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1027 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1028 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1029 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1030 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1031 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1032 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1033 Rule Cuba 1978 only - May 7 0:00 1:00 D
1034 Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S
1035 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1036 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1037 Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S
1038 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1039 Rule Cuba 1990 only - Apr 1 0:00 1:00 D
1040 Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D
1042 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1043 Zone America/Havana -5:29:28 - LMT 1890
1044 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT
1045 -5:00 Cuba C%sT
1047 # Dominica
1048 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1049 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1050 -4:00 - AST
1052 # Dominican Republic
1053 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1054 Rule DR 1966 only - Oct 30 0:00 1:00 D
1055 Rule DR 1967 only - Feb 28 0:00 0 S
1056 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1057 Rule DR 1970 only - Feb 21 0:00 0 S
1058 Rule DR 1971 only - Jan 20 0:00 0 S
1059 Rule DR 1972 1974 - Jan 21 0:00 0 S
1060 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1061 Zone America/Santo_Domingo -4:39:36 - LMT 1890
1062 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1063 -5:00 DR E%sT 1974 Oct 27
1064 -4:00 - AST
1066 # El Salvador
1067 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1068 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1069 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1070 # There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1071 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1072 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1073 -6:00 Salv C%sT
1075 # Grenada
1076 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1077 Zone America/Grenada -4:07:00 - LMT 1911 Jul
1078 -4:00 - AST
1080 # Guadeloupe
1081 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1082 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1083 -4:00 - AST
1085 # Guatemala
1086 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1087 Rule Guat 1973 only - Nov 25 0:00 1:00 D
1088 Rule Guat 1974 only - Feb 24 0:00 0 S
1089 Rule Guat 1983 only - May 21 0:00 1:00 D
1090 Rule Guat 1983 only - Sep 22 0:00 0 S
1091 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1092 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1093 -6:00 Guat C%sT
1095 # Haiti
1096 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1097 Rule Haiti 1983 only - May 8 0:00 1:00 D
1098 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1099 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1100 Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D
1101 Rule Haiti 1988 max - Oct lastSun 2:00 0 S
1102 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1103 Zone America/Port-au-Prince -4:49:20 - LMT 1890
1104 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1105 -5:00 Haiti E%sT
1107 # Honduras
1108 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1109 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1110 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1111 -6:00 Salv C%sT
1113 # Jamaica
1115 # From Bob Devine (January 28, 1988):
1116 # Follows US rules.
1118 # From U. S. Naval Observatory (January 19, 1989):
1119 # JAMAICA 5 H BEHIND UTC
1121 # From Shanks (1991):
1122 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1123 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1124 -5:07 - KMT 1912 Feb # Kingston Mean Time
1125 -5:00 - EST 1974 Jan 6 2:00
1126 -5:00 US E%sT
1128 # Martinique
1129 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1130 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1131 -4:04 - FFMT 1911 May # Fort-de-France MT
1132 -4:00 - AST 1980 Apr 6
1133 -4:00 1:00 ADT 1980 Sep 28
1134 -4:00 - AST
1136 # Montserrat
1137 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1138 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth
1139 -4:00 - AST
1141 # Nicaragua
1142 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1143 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1144 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1145 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1146 Zone America/Managua -5:45:08 - LMT 1890
1147 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
1148 -6:00 - CST 1973 May
1149 -5:00 - EST 1975 Feb 16
1150 -6:00 Nic C%sT
1152 # Panama
1153 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1154 Zone America/Panama -5:18:08 - LMT 1890
1155 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
1156 -5:00 - EST
1158 # Puerto Rico
1159 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1160 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1161 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1162 -4:00 - AST 1942 May 3
1163 -4:00 1:00 AWT 1945 Sep 30 2:00
1164 -4:00 - AST
1166 # St Kitts-Nevis
1167 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1168 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1169 -4:00 - AST
1171 # St Lucia
1172 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1173 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1174 -4:04 - CMT 1912 # Castries Mean Time
1175 -4:00 - AST
1177 # St Pierre and Miquelon
1178 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1179 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1180 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1181 -4:00 - AST 1980 May
1182 -3:00 Mont SP%sT
1184 # St Vincent and the Grenadines
1185 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1186 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1187 -4:05 - KMT 1912 # Kingstown Mean Time
1188 -4:00 - AST
1190 # Turks and Caicos
1191 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1192 Zone America/Grand_Turk -4:44:32 - LMT 1890
1193 -5:07 - KMT 1912 Feb # Kingston Mean Time
1194 -5:00 - EST 1979 Apr 29 2:00
1195 -5:00 US E%sT
1197 # British Virgin Is
1198 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1199 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1200 -4:00 - AST
1202 # Virgin Is
1203 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1204 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
1205 -4:00 - AST