1 # $OpenBSD: northamerica,v 1.5 1997/01/14 04:36:54 millert Exp $
2 # @(#)northamerica 7.30
3 # also includes Central America and the Caribbean
5 # This data is by no means authoritative; if you think you know better,
6 # go ahead and edit the file (and please send any changes to
7 # tz@elsie.nci.nih.gov for general use in the future).
9 # From Paul Eggert <eggert@twinsun.com> (1994-08-17):
10 # A reliable and entertaining source about time zones is
11 # Derek Howse, Greenwich time and the discovery of the longitude,
12 # Oxford University Press (1980).
14 ###############################################################################
18 # From Paul Eggert <eggert@twinsun.com> (1995-12-19):
19 # A good source for time zone historical data in the US is
20 # Thomas G. Shanks, The American Atlas (5th edition),
21 # San Diego: ACS Publications, Inc. (1991).
22 # Make sure you have the errata sheet; the book is somewhat useless without it.
23 # It is the source for the US and Puerto Rico entries below.
25 # From Paul Eggert (1996-06-12):
26 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
27 # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784).
28 # Not everyone is happy with the results:
30 # I don't really care how time is reckoned so long as there is some
31 # agreement about it, but I object to being told that I am saving
32 # daylight when my reason tells me that I am doing nothing of the kind.
33 # I even object to the implication that I am wasting something
34 # valuable if I stay in bed after the sun has risen. As an admirer
35 # of moonlight I resent the bossy insistence of those who want to
36 # reduce my time for enjoying it. At the back of the Daylight Saving
37 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
38 # to push people into bed earlier, and get them up earlier, to make
39 # them healthy, wealthy and wise in spite of themselves.
41 # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
43 # From Arthur David Olson:
44 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
45 # See, for example, the front page of the Saturday, 1974-10-26
46 # and Sunday, 1974-10-27 editions of the Washington Post.
48 # From Arthur David Olson:
49 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
50 # Daylight Saving Time in the US was by local option, except during wartime.
52 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
53 Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War
54 Rule US 1918 1919 - Oct lastSun 2:00 0 S
55 Rule US 1942 only - Feb 9 2:00 1:00 W # War
56 Rule US 1945 only - Sep 30 2:00 0 S
57 Rule US 1967 max - Oct lastSun 2:00 0 S
58 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
59 Rule US 1974 only - Jan 6 2:00 1:00 D
60 Rule US 1975 only - Feb 23 2:00 1:00 D
61 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
62 Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
64 # From Bob Devine (1988-01-28):
65 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
67 # Pacific Standard Time(PST) -same-
68 # Yukon Standard Time(YST) -same-
69 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
70 # Nome Standard Time (NT) Bering Standard Time (BST)
72 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
73 # The YST zone now covers nearly all of the state, AHST just part
74 # of the Aleutian islands. No DST.
76 # From Paul Eggert (1995-12-19):
77 # The tables below use `NST', not `NT', for Nome Standard Time.
78 # I invented `CAWT' for Central Alaska War Time.
80 # From U. S. Naval Observatory (1989-01-19):
81 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
82 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
83 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
84 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
85 # USA MOUNTAIN 7 H BEHIND UTC DENVER
86 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
87 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
88 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
89 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
90 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
91 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
92 # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
93 # USA HAWAII 10 H BEHIND UTC
94 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
96 # From Arthur David Olson (1989-01-21):
97 # The above dates are for 1988.
98 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
99 # no DST in Samoa, and the claim that there is DST in Alaska and the
102 # From Arthur David Olson (1988-02-13):
103 # Legal standard time zone names, from United States Code (1982 Edition and
104 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
105 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
106 # took effect), as explained in sections 263 and 261:
108 # United States standard eastern time
109 # United States standard mountain time
110 # United States standard central time
111 # United States standard Pacific time
113 # United States standard Alaska time
115 # Next, names from 1967-04-01 until 1983-11-30 (the date for
116 # public law 98-181):
117 # Atlantic standard time
118 # eastern standard time
119 # central standard time
120 # mountain standard time
121 # Pacific standard time
122 # Yukon standard time
123 # Alaska-Hawaii standard time
124 # Bering standard time
125 # And after 1983-11-30:
126 # Atlantic standard time
127 # eastern standard time
128 # central standard time
129 # mountain standard time
130 # Pacific standard time
131 # Alaska standard time
132 # Hawaii-Aleutian standard time
133 # Samoa standard time
134 # The law doesn't give abbreviations.
136 # From Paul Eggert (1995-12-19):
137 # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
140 # US Eastern time, represented by New York
141 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
142 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
143 Rule NYC 1920 only - Oct lastSun 2:00 0 S
144 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
145 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
146 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
147 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
148 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
155 # US Central time, represented by Chicago
156 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
157 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
158 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
159 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
160 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
161 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
162 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
163 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
164 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
166 -6:00 Chicago C%sT 1936 Mar 1 2:00
167 -5:00 - EST 1936 Nov 15 2:00
168 -6:00 Chicago C%sT 1942
170 -6:00 Chicago C%sT 1967
173 # US Mountain time, represented by Denver
174 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
175 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
176 Rule Denver 1920 only - Oct lastSun 2:00 0 S
177 Rule Denver 1921 only - May 22 2:00 0 S
178 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
179 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
180 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
181 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
183 -7:00 Denver M%sT 1942
185 -7:00 Denver M%sT 1967
188 # US Pacific time, represented by Los Angeles
189 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
190 Rule CA 1948 only - Mar 14 2:00 1:00 D
191 Rule CA 1949 only - Jan 1 2:00 0 S
192 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
193 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
194 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
195 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
196 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
202 # AK%sT is the modern abbreviation for -9:00 per USNO.
204 # From Paul Eggert (1995-12-19):
205 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
206 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
207 # This was on 1867-10-18. We omit this transition, since we can't represent
208 # changes from Julian to Gregorian.
210 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
211 Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00
215 -8:00 US P%sT 1983 Oct 30 2:00
217 Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00
221 -9:00 US Y%sT 1983 Oct 30 2:00
223 Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00
225 -10:00 US CAT/CAWT 1946
226 -10:00 - CAT 1967 Apr
228 -10:00 US AH%sT 1983 Oct 30 2:00
230 Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00
233 -11:00 - NST 1967 Apr
235 -11:00 US B%sT 1983 Oct 30 2:00
237 Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00
240 -11:00 - NST 1967 Apr
242 -11:00 US B%sT 1983 Oct 30 2:00
244 # Shanks writes that part of southwest Alaska (e.g. Aniak)
245 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
246 # and another part (e.g. Akiak) made the same switch five weeks later.
247 # These switches don't quite make our 1970 cutoff.
251 # From Arthur David Olson:
252 # And then there's Hawaii.
253 # DST was observed for one day in 1933;
254 # standard time was changed by half an hour in 1947;
255 # it's always standard as of 1986.
258 # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
260 Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
261 -10:30 - HST 1933 Apr 30 2:00
262 -10:30 1:00 HDT 1933 May 21 2:00
263 -10:30 US H%sT 1947 Jun 8 2:00
266 Zone Pacific/Midway -11:49:28 - LMT 1901
267 -11:00 - NST 1967 Apr # N=Nome
268 -11:00 - BST 1983 Nov 30 # B=Bering
269 -11:00 - SST # S=Samoa
271 # Now we turn to US areas that have diverged from the consensus since 1970.
273 # Arizona mostly uses MST.
274 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
275 -7:00 US M%sT 1944 Jan 1 00:01
276 -7:00 - MST 1944 Mar 17 00:01
277 -7:00 US M%sT 1944 Oct 1 00:01
281 # From Arthur David Olson (1988-02-13):
282 # A writer from the Inter Tribal Council of Arizona, Inc.,
283 # notes in private correspondence dated 12/28/87 that "Presently, only the
284 # Navajo Nation participates in the Daylight Saving Time policy, due to its
285 # large size and location in three states." (The "only" means that other
286 # tribal nations don't use DST.)
288 Link America/Denver America/Shiprock
290 # Southern Idaho and eastern Oregon switched four weeks late in 1974.
291 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
292 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
293 -8:00 US P%sT 1923 May 13 2:00
295 -7:00 - MST 1974 Feb 3 2:00
300 # From Paul Eggert (1995-12-19):
301 # Indiana generally observes either EST all year, or CST/CDT,
302 # but areas near Cincinnati and Louisville use those cities' timekeeping
303 # and in 1969 and 1970 the whole state observed daylight time;
304 # and there are other exceptions as noted below.
305 # Shanks partitions Indiana into 345 regions, each with its own time history,
306 # and writes ``Even newspaper reports present contradictory information.''
307 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
309 # Since 1970, EST-only Indiana has been like America/Indianapolis,
310 # with exceptions noted below for Crawford, Starke, and Switzerland counties.
311 # The parts of Indiana not listed below have been like America/Chicago,
312 # America/Louisville, or America/New_York.
314 # Other than Indianapolis, the Indiana place names are so nondescript
315 # that they would be ambiguous if we left them at the `America' level.
316 # So we reluctantly put them all in a subdirectory `America/Indiana'.
318 # Most of EST-only Indiana last observed DST in 1970.
319 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
320 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
321 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
322 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
323 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
324 Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
326 -6:00 Indianapolis C%sT 1942
328 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
329 -5:00 - EST 1957 Sep 29 2:00
330 -6:00 - CST 1958 Apr 27 2:00
334 Link America/Indianapolis America/Indiana/Indianapolis
336 # Part of Crawford County, Indiana, last observed DST in 1975,
337 # and left its clocks alone in 1974.
338 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
339 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
340 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
341 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
342 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
343 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
344 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
346 -6:00 Marengo C%sT 1961 Apr 30 2:00
348 -5:00 US E%sT 1974 Jan 6 2:00
349 -6:00 1:00 CDT 1974 Oct 27 2:00
353 # Starke County, Indiana
354 # From Arthur David Olson (1991-10-28):
355 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
356 # notes that Starke County switched from Central time to Eastern time as of
358 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
359 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
360 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
361 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
362 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
363 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
364 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
365 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
367 -6:00 Starke C%sT 1962 Apr 29 2:00
368 -5:00 - EST 1963 Oct 27 2:00
369 -6:00 US C%sT 1991 Oct 27 2:00
372 # Switzerland County, Indiana, last observed DST in 1972.
373 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
374 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
375 -6:00 US C%sT 1954 Apr 25 2:00
380 # Part of Kentucky left its clocks alone in 1974.
381 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
382 Rule Louisville 1921 only - May 1 2:00 1:00 D
383 Rule Louisville 1921 only - Sep 1 2:00 0 S
384 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
385 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
386 Rule Louisville 1946 only - Jun 2 2:00 0 S
387 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
388 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
389 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
390 Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
392 -6:00 Louisville C%sT 1942
394 -6:00 Louisville C%sT 1961 Jul 23 2:00
396 -5:00 US E%sT 1974 Jan 6 2:00
397 -6:00 1:00 CDT 1974 Oct 27 2:00
402 # From Bob Devine (1988-01-28):
403 # Michigan didn't observe DST from 1968 to 1973.
405 # From Paul Eggert (1995-12-19):
406 # Shanks writes that Michigan started using standard time on 1885 Sep 18,
407 # but Howse (p 126) writes that Detroit kept
409 # local time until 1900 when the City Council decreed that clocks should
410 # be put back twenty-eight minutes to Central Standard Time. Half the
411 # city obeyed, half refused. After considerable debate, the decision
412 # was rescinded and the city reverted to Sun time. A derisive offer to
413 # erect a sundial in front of the city hall was referred to the
414 # Committee on Sewers. Then, in 1905, Central time was adopted
417 # This story is too entertaining to be false, so go with Howse over Shanks.
419 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
420 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
421 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
422 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
423 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
424 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
425 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
426 Zone America/Detroit -5:32:11 - LMT 1905
427 -6:00 - CST 1915 May 15 2:00
430 -5:00 Detroit E%sT 1973
432 -5:00 - EST 1975 Apr 27 2:00
435 # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
436 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
437 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
438 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
439 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
440 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
441 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
442 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
444 -6:00 Menominee C%sT 1969 Apr 27 2:00
445 -5:00 - EST 1973 Apr 29 2:00
452 # Old names, for S5 users
454 # Link LINK-FROM LINK-TO
455 Link America/New_York EST5EDT
456 Link America/Chicago CST6CDT
457 Link America/Denver MST7MDT
458 Link America/Los_Angeles PST8PDT
459 Link America/Indianapolis EST
460 Link America/Phoenix MST
461 Link Pacific/Honolulu HST
463 ################################################################################
466 # From Paul Eggert <eggert@twinsun.com> (1996-11-22):
467 # A good source for time zone historical data outside the US is
468 # Thomas G. Shanks, The International Atlas (3rd edition),
469 # San Diego: ACS Publications, Inc. (1991).
471 # Gwillim Law <LAW@encmail.encompass.com> writes that a good source
472 # for recent time zone data is the International Air Transport
473 # Association's Standard Schedules Information Manual (IATA SSIM),
474 # published semiannually. Law sent in several helpful summaries
475 # of the IATA's data after 1990.
477 # Except where otherwise noted, Shanks is the source for entries through 1990,
478 # and IATA SSIM is the source for entries after 1990.
480 # Another source occasionally used is Edward W. Whitman, World Time Differences,
481 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
482 # I found in the UCLA library.
484 # See the `europe' file for Greenland.
486 # See the `africa' file for time zone naming and abbreviation conventions.
490 # From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
491 # I post here the time zone abbreviations standardized in Canada
492 # for both English and French in the CAN/CSA-Z234.4-89 standard....
494 # UTC Standard time Daylight savings time
495 # offset French English French English
506 # HN: Heure Normale ST: Standard Time
507 # HA: Heure Avanc<e'>e DT: Daylight saving Time
509 # A: de l'Atlantique Atlantic
510 # C: du Centre Central
511 # E: de l'Est Eastern
514 # P: du Pacifique Pacific
519 # From Paul Eggert <eggert@twinsun.com> (1994-11-22):
520 # Alas, this sort of thing must be handled by localization software.
522 # The data for Canada are all from Shanks (1991).
525 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
526 Rule Canada 1918 only - Apr 14 2:00 1:00 D
527 Rule Canada 1918 only - Oct 31 2:00 0 S
528 Rule Canada 1942 only - Feb 9 2:00 1:00 D
529 Rule Canada 1945 only - Sep 30 2:00 0 S
530 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
531 Rule Canada 1974 max - Oct lastSun 2:00 0 S
532 Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
535 # Newfoundland (except Labrador)
537 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
538 Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
539 Rule StJohns 1917 only - Sep 17 2:00 0 S
540 Rule StJohns 1918 only - Oct 31 2:00 0 S
541 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
542 Rule StJohns 1919 only - May 5 23:00 1:00 D
543 Rule StJohns 1919 only - Aug 12 23:00 0 S
544 # For 1931-1935 Whitman gives Apr same date; go with Shanks.
545 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
546 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
547 # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
548 Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
549 Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
550 # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
551 Rule StJohns 1942 only - Mar 1 0:00 1:00 D
552 Rule StJohns 1942 only - Dec 31 0:00 0 S
553 Rule StJohns 1943 only - May 30 0:00 1:00 D
554 Rule StJohns 1943 only - Sep 5 0:00 0 S
555 Rule StJohns 1944 only - Jul 10 0:00 1:00 D
556 Rule StJohns 1944 only - Sep 2 0:00 0 S
557 Rule StJohns 1945 only - Jan 1 0:00 1:00 D
558 Rule StJohns 1945 only - Oct 7 2:00 0 S
559 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
560 # Apr 30 - Sep 24; go with Shanks.
561 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
562 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
563 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
564 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
565 Rule StJohns 1960 max - Oct lastSun 2:00 0 S
566 Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
567 Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD
568 Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
569 # St John's has an apostrophe, but Posix file names can't have apostrophes.
570 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
571 Zone America/St_Johns -3:30:52 - LMT 1884
572 -3:30:52 StJohns N%sT 1935 Mar 30
578 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
579 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
580 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
581 -3:30:52 StJohns NST 1919
582 -3:30:52 - NST 1935 Mar 30
584 -3:30 StJohns N%sT 1966 Mar 15 2:00
588 # west Labrador, New Brunswick, Nova Scotia, Prince Edward I
590 # From Paul Eggert (1996-06-12):
591 # Shanks writes that since 1970 most of this region has been like Halifax.
592 # Many locales did not observe peacetime DST until 1972;
593 # Glace Bay, NS is the largest that we know of.
594 # Shanks also writes that Liverpool, NS was the only town in Canada to observe
595 # DST in 1971 but not 1970; for now we'll assume this is a typo.
597 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
598 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
599 Rule Halifax 1916 only - Oct 1 0:00 0 S
600 Rule Halifax 1918 only - Apr 14 2:00 1:00 D
601 Rule Halifax 1918 only - Oct 31 2:00 0 S
602 Rule Halifax 1920 only - May 9 0:00 1:00 D
603 Rule Halifax 1920 only - Aug 29 0:00 0 S
604 Rule Halifax 1921 only - May 6 0:00 1:00 D
605 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
606 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
607 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
608 Rule Halifax 1923 only - Sep 4 0:00 0 S
609 Rule Halifax 1924 only - Sep 15 0:00 0 S
610 Rule Halifax 1925 only - Sep 28 0:00 0 S
611 Rule Halifax 1926 only - May 16 0:00 1:00 D
612 Rule Halifax 1926 only - Sep 13 0:00 0 S
613 Rule Halifax 1927 only - May 1 0:00 1:00 D
614 Rule Halifax 1927 only - Sep 26 0:00 0 S
615 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
616 Rule Halifax 1928 only - Sep 9 0:00 0 S
617 Rule Halifax 1929 only - Sep 3 0:00 0 S
618 Rule Halifax 1930 only - Sep 15 0:00 0 S
619 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
620 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
621 Rule Halifax 1933 only - Oct 2 0:00 0 S
622 Rule Halifax 1934 only - May 20 0:00 1:00 D
623 Rule Halifax 1934 only - Sep 16 0:00 0 S
624 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
625 Rule Halifax 1935 only - Sep 30 0:00 0 S
626 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
627 Rule Halifax 1936 only - Sep 14 0:00 0 S
628 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
629 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
630 Rule Halifax 1939 only - May 28 0:00 1:00 D
631 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
632 Rule Halifax 1942 only - Feb 9 2:00 1:00 D
633 Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
634 Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
635 Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
636 Rule Halifax 1962 max - Oct lastSun 2:00 0 S
637 Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
638 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
639 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
641 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
642 -4:00 Canada A%sT 1953
643 -4:00 Halifax A%sT 1954
650 # From Paul Eggert (1996-06-12):
651 # Shanks writes that since 1970 most of this region has been like Montreal.
652 # Thunder Bay skipped DST in 1973.
653 # Many smaller locales did not observe peacetime DST until 1974;
654 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
655 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
657 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
658 Rule Mont 1917 only - Mar 25 2:00 1:00 D
659 Rule Mont 1917 only - Apr 24 0:00 0 S
660 Rule Mont 1918 only - Apr 14 2:00 1:00 D
661 Rule Mont 1918 only - Oct 31 2:00 0 S
662 Rule Mont 1919 only - Mar 31 2:30 1:00 D
663 Rule Mont 1919 only - Oct 25 2:30 0 S
664 Rule Mont 1920 only - May 2 2:30 1:00 D
665 Rule Mont 1920 only - Oct 3 2:30 0 S
666 Rule Mont 1921 only - May 1 2:00 1:00 D
667 Rule Mont 1921 only - Oct 2 2:30 0 S
668 Rule Mont 1922 only - Apr 30 2:00 1:00 D
669 Rule Mont 1922 only - Oct 1 2:30 0 S
670 Rule Mont 1924 only - May 17 2:00 1:00 D
671 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
672 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
673 Rule Mont 1927 only - May 1 0:00 1:00 D
674 Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
675 Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
676 Rule Mont 1932 only - May 1 0:00 1:00 D
677 Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
678 Rule Mont 1933 only - Oct 1 0:00 0 S
679 Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
680 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
681 Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
682 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
683 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
684 Rule Mont 1957 max - Oct lastSun 2:00 0 S
685 Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
686 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
687 Zone America/Montreal -4:54:16 - LMT 1884
689 Zone America/Thunder_Bay -5:57:00 - LMT 1895
690 -5:00 Canada E%sT 1970
694 Zone America/Nipigon -5:53:04 - LMT 1895
696 Zone America/Rainy_River -6:17:56 - LMT 1895
702 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
703 Rule Winn 1916 only - Apr 23 0:00 1:00 D
704 Rule Winn 1916 only - Sep 17 0:00 0 S
705 Rule Winn 1918 only - Apr 14 2:00 1:00 D
706 Rule Winn 1918 only - Oct 31 2:00 0 S
707 Rule Winn 1937 only - May 16 2:00 1:00 D
708 Rule Winn 1937 only - Sep 26 2:00 0 S
709 Rule Winn 1942 only - Feb 9 2:00 1:00 D
710 Rule Winn 1945 only - Sep lastSun 2:00 0 S
711 Rule Winn 1946 only - May 12 2:00 1:00 D
712 Rule Winn 1946 only - Oct 13 2:00 0 S
713 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
714 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
715 Rule Winn 1950 only - May 1 2:00 1:00 D
716 Rule Winn 1950 only - Sep 30 2:00 0 S
717 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
718 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
719 Rule Winn 1959 only - Oct lastSun 2:00 0 S
720 Rule Winn 1960 only - Sep lastSun 2:00 0 S
721 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
722 Rule Winn 1963 only - Sep 22 2:00 0 S
723 Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
724 Rule Winn 1966 max - Oct lastSun 2:00 0 S
725 Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
726 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
727 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
733 # From Paul Eggert (1996-06-12):
734 # Shanks writes that since 1970 most of this region has been like Regina.
735 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
736 # Other western towns (e.g. Lloydminster) are like Edmonton.
738 # From W. Jones <jones@skdad.usask.ca> (1992-11-06):
739 # The. . .below is based on information I got from our law library, the
740 # provincial archives, and the provincial Community Services department.
741 # A precise history would require digging through newspaper archives, and
742 # since you didn't say what you wanted, I didn't bother.
744 # Saskatchewan is split by a time zone meridian (105W) and over the years
745 # the boundary became pretty ragged as communities near it reevaluated
746 # their affiliations in one direction or the other. In 1965 a provincial
747 # referendum favoured legislating common time practices.
749 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
750 # Saskatchewan 1978) was proclaimed, and established that the eastern
751 # part of Saskatchewan would use CST year round, that districts in
752 # northwest Saskatchewan would by default follow CST but could opt to
753 # follow Mountain Time rules (thus 1 hour difference in the winter and
754 # zero in the summer), and that districts in southwest Saskatchewan would
755 # by default follow MT but could opt to follow CST.
757 # It took a few years for the dust to settle (I know one story of a town
758 # on one time zone having its school in another, such that a mom had to
759 # serve her family lunch in two shifts), but presently it seems that only
760 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
761 # rules any more; all other districts appear to have used CST year round
762 # since sometime in the 1960s.
764 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
765 Rule Regina 1918 only - Apr 14 2:00 1:00 D
766 Rule Regina 1918 only - Oct 31 2:00 0 S
767 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
768 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
769 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
770 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
771 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
772 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
773 Rule Regina 1942 only - Feb 9 2:00 1:00 D
774 Rule Regina 1945 only - Sep lastSun 2:00 0 S
775 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
776 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
777 Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
778 Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
779 Rule Regina 1959 only - Oct lastSun 2:00 0 S
781 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
782 Rule Swift 1957 only - Oct lastSun 2:00 0 S
783 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
784 Rule Swift 1959 only - Oct lastSun 2:00 0 S
785 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
786 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
787 Zone America/Regina -6:58:36 - LMT 1905 Sep
788 -7:00 Regina M%sT 1960 Apr lastSun 2:00
790 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
791 -7:00 Canada M%sT 1946 Apr lastSun 2:00
792 -7:00 Regina M%sT 1950
793 -7:00 Swift M%sT 1972 Apr lastSun 2:00
799 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
800 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
801 Rule Edm 1918 only - Oct 31 2:00 0 S
802 Rule Edm 1919 only - May 27 2:00 0 S
803 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
804 Rule Edm 1920 only - Oct lastSun 2:00 0 S
805 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
806 Rule Edm 1942 only - Feb 9 2:00 1:00 D
807 Rule Edm 1945 only - Sep lastSun 2:00 0 S
808 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
809 Rule Edm 1947 only - Sep lastSun 2:00 0 S
810 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
811 Rule Edm 1967 only - Oct lastSun 2:00 0 S
812 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
813 Rule Edm 1969 only - Oct lastSun 2:00 0 S
814 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
815 Rule Edm 1972 max - Oct lastSun 2:00 0 S
816 Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
817 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
818 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
824 # From Paul Eggert (1996-06-12):
825 # Shanks writes that since 1970 most of this region has been like Vancouver.
826 # Dawswon Creek uses MST. Much of east BC is like Edmonton.
828 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
829 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
830 Rule Vanc 1918 only - Oct 31 2:00 0 S
831 Rule Vanc 1942 only - Feb 9 2:00 1:00 D
832 Rule Vanc 1945 only - Sep 30 2:00 0 S
833 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
834 Rule Vanc 1946 only - Oct 13 2:00 0 S
835 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
836 Rule Vanc 1962 max - Oct lastSun 2:00 0 S
837 Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
838 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
839 Zone America/Vancouver -8:12:28 - LMT 1884
841 Zone America/Dawson_Creek -8:00:56 - LMT 1884
842 -8:00 Canada P%sT 1947
843 -8:00 Vanc P%sT 1972 Aug 30 2:00
847 # Northwest Territories, Yukon
849 # From Paul Eggert (1996-10-07):
850 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
851 # Shanks's table for Watson Lake is corrupted, so we have no data there.
852 # Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
853 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
854 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
855 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
856 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
857 # * O.I.C. 1980/02 established DST.
858 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
859 # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
861 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
862 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
863 Rule NT_YK 1918 only - Oct 27 2:00 0 S
864 Rule NT_YK 1919 only - May 25 2:00 1:00 D
865 Rule NT_YK 1919 only - Nov 1 0:00 0 S
866 Rule NT_YK 1942 only - Feb 9 2:00 1:00 D
867 Rule NT_YK 1945 only - Sep 30 2:00 0 S
868 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
869 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
870 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
871 Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
872 Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
873 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
874 Zone America/Pangnirtung -4:22:56 - LMT 1884
876 Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay
878 Zone America/Rankin_Inlet -6:08:40 - LMT 1884
880 Zone America/Yellowknife -7:37:24 - LMT 1884
882 Zone America/Inuvik -8:54:00 - LMT 1884
883 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
885 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
886 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
888 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
889 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
893 ###############################################################################
898 # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
899 # Rules prior to 1987 are unknown.
900 # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
901 # observe DST." This is presumably Baja California Norte, above 28th parallel,
902 # as listed there; [there is also] "Baja California Sur and N. Pacific
903 # Coast (States of Sinaloa and Sonora)."
905 # From Bob Devine (1988-01-28):
906 # The Federal District (where Mexico City is) has observed [DST] several
907 # times but not recently.
909 # I don't where to drawn the line in the North Baja area. 28th latitude
910 # sounds good -- but it may be higher (how far [d]o radio stations from
911 # San Diego affect culture?).
913 # The dates of DST probably go back to 1981. The rules are the same as
914 # US's. This is going to be a headache for US presidential electi[o]n years!
916 # From Arthur David Olson (1988-02-13)
917 # Since the 1981 starting date is only "probable," we'll keep the 1987
918 # starting date below.
920 # From U. S. Naval Observatory (1989-01-19):
921 # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
922 # MEXICO BAJA CAL N N. PACIFIC COAST (STATES
923 # MEXICO BAJA CAL N OF SINALOA AND SONORA)
924 # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
925 # MEXICO BAJA CAL N - OCT 29
926 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
927 # MEXICO BAJA CAL N - 0CT 29
928 # MEXICO 6 H BEHIND UTC STATES OF DURANGO,
929 # MEXICO COAHUILA, NUEVO LEON,
931 # MEXICO 5 H BEHIND UTC STATES OF DURANGO,
932 # MEXICO COAHUILA, NUEVO LEON,
933 # MEXICO TAMAULIPAS APR 3 - OCT 29
934 # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
935 # MEXICO CAMPECHE, QUINTANA ROO AND
938 # From Arthur David Olson (1989-01-21):
939 # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
940 # USNO claims there should be four Mexican zones rather than three:
941 # a zone that's GMT-8 with DST; a zone that's always GMT-7;
942 # a zone that's GMT-6 with DST; and a zone that's always GMT-6.
944 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
945 # Shanks also says there are four zones, but disagrees about the fourth.
946 # Instead of GMT-6 with DST, he says there's GMT-8 without DST.
948 # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
949 # A guy from our Mexico subsidiary finally found the Presidential Decree
950 # outlining the timezone changes in Mexico.
952 # ------------- Begin Forwarded Message -------------
954 # I finally got my hands on the Official Presidential Decree that sets up the
955 # rules for the DST changes. The rules are:
957 # 1. The country is divided in 3 timezones:
958 # - Baja California Norte (the Mexico/BajaNorte TZ)
959 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
960 # - The rest of the country (the Mexico/General TZ)
962 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
963 # at 2:00 AM, the times in each zone are as follows:
968 # 3. The rest of the year, the times are as follows:
973 # The Decree was published in Mexico's Official Newspaper on January 4th.
975 # -------------- End Forwarded Message --------------
976 # From Paul Eggert (1996-06-12):
977 # For an English translation of the decree,
978 # see ``Diario Oficial: Time Zone Changeover'',
979 # <URL:http://mexico-travel.com/extra/timezone_eng.html> (1996-01-04).
981 # From Shanks (1991):
982 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
983 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
984 Rule Mexico 1939 only - Jun 25 0:00 0 S
985 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
986 Rule Mexico 1941 only - Apr 1 0:00 0 S
987 Rule Mexico 1943 only - Dec 16 0:00 1:00 D
988 Rule Mexico 1944 only - May 1 0:00 0 S
989 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
990 Rule Mexico 1950 only - Jul 30 0:00 0 S
991 Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
992 Rule Mexico 1996 max - Oct lastSun 2:00 0 S
994 Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
995 Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
996 Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
997 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
998 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
999 -7:00 - MST 1927 Jun 10 23:00
1000 -6:00 - CST 1930 Nov 15
1001 -7:00 - MST 1931 May 1 23:00
1002 -6:00 - CST 1931 Oct
1003 -7:00 - MST 1932 Mar 30 23:00
1005 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
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 - CST 1942 Apr
1012 -7:00 - MST 1949 Jan 14
1015 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1016 -8:00 - PST 1927 Jun 10 23:00
1017 -7:00 - MST 1930 Nov 16
1018 -8:00 - PST 1942 Apr
1019 -7:00 - MST 1949 Jan 14
1020 -8:00 BajaN P%sT 1967 Apr lastSun 2:00
1023 Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
1024 -8:00 - PST 1927 Jun 10 23:00
1025 -7:00 - MST 1930 Nov 16
1026 -8:00 - PST 1942 Apr
1027 -7:00 - MST 1949 Jan 14
1034 ###############################################################################
1037 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1038 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1041 # Antigua and Barbuda
1042 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1043 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1048 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1049 Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1050 Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1051 Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1052 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1053 Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1057 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1058 Rule Barb 1977 only - Jun 12 2:00 1:00 D
1059 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1060 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1061 Rule Barb 1979 only - Sep 30 2:00 0 S
1062 Rule Barb 1980 only - Sep 25 2:00 0 S
1063 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1064 Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1065 -3:58 - BMT 1932 # Bridgetown Mean Time
1069 # Whitman entirely disagrees with Shanks; go with Shanks.
1070 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1071 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1072 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1073 Rule Belize 1973 only - Dec 5 0:00 1:00 D
1074 Rule Belize 1974 only - Feb 9 0:00 0 S
1075 Rule Belize 1982 only - Dec 18 0:00 1:00 D
1076 Rule Belize 1983 only - Feb 12 0:00 0 S
1077 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1078 Zone America/Belize -5:52:48 - LMT 1912 Apr
1082 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1083 Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1084 -4:00 - AST 1974 Apr 28 2:00
1088 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1089 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1090 -5:07 - KMT 1912 Feb # Kingston Mean Time
1097 # Shanks gives some very odd dates for 1991, and stops there.
1098 # For now, we won't guess further.
1099 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1100 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1101 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1102 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1103 # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1104 Rule CR 1991 only - Jul 1 0:00 0 S
1105 Rule CR 1992 only - Mar 15 0:00 0 S
1106 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1107 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1108 Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1109 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
1112 # no information; probably like America/Costa_Rica
1116 # From Bob Devine (1988-01-28):
1117 # . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
1118 # Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
1121 # From U. S. Naval Observatory (1989-01-19):
1122 # CUBA 5 H BEHIND UTC
1123 # CUBA 4 H BEHIND UTC MAR 20 - OCT 8
1125 # From Shanks (1991):
1126 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1127 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1128 Rule Cuba 1928 only - Oct 10 0:00 0 S
1129 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1130 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1131 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1132 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1133 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1134 Rule Cuba 1965 only - Sep 30 0:00 0 S
1135 Rule Cuba 1966 only - May 29 0:00 1:00 D
1136 Rule Cuba 1966 only - Oct 2 0:00 0 S
1137 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1138 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1139 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1140 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1141 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1142 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1143 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1144 Rule Cuba 1978 only - May 7 0:00 1:00 D
1145 Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S
1146 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1147 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1148 Rule Cuba 1981 1990 - Oct Sun>=8 0:00 0 S
1149 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1150 Rule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D
1151 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1152 Rule Cuba 1996 max - Oct Sun>=1 0:00s 0 S
1154 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1155 Zone America/Havana -5:29:28 - LMT 1890
1156 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT
1160 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1161 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1164 # Dominican Republic
1165 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1166 Rule DR 1966 only - Oct 30 0:00 1:00 D
1167 Rule DR 1967 only - Feb 28 0:00 0 S
1168 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1169 Rule DR 1970 only - Feb 21 0:00 0 S
1170 Rule DR 1971 only - Jan 20 0:00 0 S
1171 Rule DR 1972 1974 - Jan 21 0:00 0 S
1172 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1173 Zone America/Santo_Domingo -4:39:36 - LMT 1890
1174 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1175 -5:00 DR E%sT 1974 Oct 27
1179 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1180 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1181 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1182 # There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1183 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1184 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1188 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1189 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1193 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1194 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1198 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1199 Rule Guat 1973 only - Nov 25 0:00 1:00 D
1200 Rule Guat 1974 only - Feb 24 0:00 0 S
1201 Rule Guat 1983 only - May 21 0:00 1:00 D
1202 Rule Guat 1983 only - Sep 22 0:00 0 S
1203 Rule Guat 1991 only - Mar 23 0:00 1:00 D
1204 Rule Guat 1991 only - Sep 7 0:00 0 S
1205 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1206 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1210 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1211 Rule Haiti 1983 only - May 8 0:00 1:00 D
1212 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1213 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1214 # Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA.
1215 Rule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D
1216 Rule Haiti 1988 max - Oct lastSun 1:00s 0 S
1217 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1218 Zone America/Port-au-Prince -4:49:20 - LMT 1890
1219 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1223 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1224 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1225 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1230 # From Bob Devine (1988-01-28):
1233 # From U. S. Naval Observatory (1989-01-19):
1234 # JAMAICA 5 H BEHIND UTC
1236 # From Shanks (1991):
1237 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1238 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1239 -5:07 - KMT 1912 Feb # Kingston Mean Time
1240 -5:00 - EST 1974 Jan 6 2:00
1245 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1246 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1247 -4:04 - FFMT 1911 May # Fort-de-France MT
1248 -4:00 - AST 1980 Apr 6
1249 -4:00 1:00 ADT 1980 Sep 28
1253 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1254 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth
1258 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1259 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1260 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1261 Rule Nic 1992 only - Jan 1 4:00 1:00 D
1262 Rule Nic 1992 only - Sep 24 0:00 0 S
1263 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1264 Zone America/Managua -5:45:08 - LMT 1890
1265 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
1266 -6:00 - CST 1973 May
1267 -5:00 - EST 1975 Feb 16
1268 -6:00 Nic C%sT 1993 Jan 1 4:00
1272 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1273 Zone America/Panama -5:18:08 - LMT 1890
1274 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
1278 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1279 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1280 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1281 -4:00 - AST 1942 May 3
1282 -4:00 1:00 AWT 1945 Sep 30 2:00
1286 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1287 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1291 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1292 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1293 -4:04 - CMT 1912 # Castries Mean Time
1296 # St Pierre and Miquelon
1297 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1298 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1299 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1300 -4:00 - AST 1980 May
1301 -3:00 Mont PM%sT # Pierre & Miquelon Time
1303 # St Vincent and the Grenadines
1304 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1305 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1306 -4:05 - KMT 1912 # Kingstown Mean Time
1310 # From Paul Eggert (1996-11-22):
1311 # Shanks says they use US DST rules, but IATA SSIM (1991/1996)
1312 # says they switch at midnight. Go with IATA SSIM.
1313 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1314 Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1315 Rule TC 1979 max - Oct lastSun 0:00 0 S
1316 Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1317 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1318 Zone America/Grand_Turk -4:44:32 - LMT 1890
1319 -5:07 - KMT 1912 Feb # Kingston Mean Time
1323 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1324 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1328 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1329 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
projects / apple / system_cmds.git / blob