1 # @(#)northamerica 7.42
2 # also includes Central America and the Caribbean
4 # This data is by no means authoritative; if you think you know better,
5 # go ahead and edit the file (and please send any changes to
6 # tz@elsie.nci.nih.gov for general use in the future).
8 # From Paul Eggert <eggert@twinsun.com> (1994-08-17):
9 # A reliable and entertaining source about time zones is
10 # Derek Howse, Greenwich time and the discovery of the longitude,
11 # Oxford University Press (1980).
13 ###############################################################################
17 # From Paul Eggert <eggert@twinsun.com> (1995-12-19):
18 # A good source for time zone historical data in the US is
19 # Thomas G. Shanks, The American Atlas (5th edition),
20 # San Diego: ACS Publications, Inc. (1991).
21 # Make sure you have the errata sheet; the book is somewhat useless without it.
22 # It is the source for the US and Puerto Rico entries below.
24 # From Paul Eggert (1996-06-12):
25 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
26 # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784).
27 # Not everyone is happy with the results:
29 # I don't really care how time is reckoned so long as there is some
30 # agreement about it, but I object to being told that I am saving
31 # daylight when my reason tells me that I am doing nothing of the kind.
32 # I even object to the implication that I am wasting something
33 # valuable if I stay in bed after the sun has risen. As an admirer
34 # of moonlight I resent the bossy insistence of those who want to
35 # reduce my time for enjoying it. At the back of the Daylight Saving
36 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
37 # to push people into bed earlier, and get them up earlier, to make
38 # them healthy, wealthy and wise in spite of themselves.
40 # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
42 # From Arthur David Olson:
43 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
44 # See, for example, the front page of the Saturday, 1974-10-26
45 # and Sunday, 1974-10-27 editions of the Washington Post.
47 # From Arthur David Olson:
48 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
49 # Daylight Saving Time in the US was by local option, except during wartime.
51 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
52 Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War
53 Rule US 1918 1919 - Oct lastSun 2:00 0 S
54 Rule US 1942 only - Feb 9 2:00 1:00 W # War
55 Rule US 1945 only - Sep 30 2:00 0 S
56 Rule US 1967 max - Oct lastSun 2:00 0 S
57 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
58 Rule US 1974 only - Jan 6 2:00 1:00 D
59 Rule US 1975 only - Feb 23 2:00 1:00 D
60 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
61 Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
62 # <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:">
64 # </a> (introduced 1999-01-06) would change April to March in the above rule.
66 # From Bob Devine (1988-01-28):
67 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
69 # Pacific Standard Time(PST) -same-
70 # Yukon Standard Time(YST) -same-
71 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
72 # Nome Standard Time (NT) Bering Standard Time (BST)
74 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
75 # The YST zone now covers nearly all of the state, AHST just part
76 # of the Aleutian islands. No DST.
78 # From Paul Eggert (1995-12-19):
79 # The tables below use `NST', not `NT', for Nome Standard Time.
80 # I invented `CAWT' for Central Alaska War Time.
82 # From U. S. Naval Observatory (1989-01-19):
83 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
84 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
85 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
86 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
87 # USA MOUNTAIN 7 H BEHIND UTC DENVER
88 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
89 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
90 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
91 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
92 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
93 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
94 # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
95 # USA HAWAII 10 H BEHIND UTC
96 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
98 # From Arthur David Olson (1989-01-21):
99 # The above dates are for 1988.
100 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
101 # no DST in Samoa, and the claim that there is DST in Alaska and the
104 # From Arthur David Olson (1988-02-13):
105 # Legal standard time zone names, from United States Code (1982 Edition and
106 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
107 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
108 # took effect), as explained in sections 263 and 261:
110 # United States standard eastern time
111 # United States standard mountain time
112 # United States standard central time
113 # United States standard Pacific time
115 # United States standard Alaska time
117 # Next, names from 1967-04-01 until 1983-11-30 (the date for
118 # public law 98-181):
119 # Atlantic standard time
120 # eastern standard time
121 # central standard time
122 # mountain standard time
123 # Pacific standard time
124 # Yukon standard time
125 # Alaska-Hawaii standard time
126 # Bering standard time
127 # And after 1983-11-30:
128 # Atlantic standard time
129 # eastern standard time
130 # central standard time
131 # mountain standard time
132 # Pacific standard time
133 # Alaska standard time
134 # Hawaii-Aleutian standard time
135 # Samoa standard time
136 # The law doesn't give abbreviations.
138 # From Paul Eggert (1995-12-19):
139 # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
142 # US Eastern time, represented by New York
143 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
144 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
145 Rule NYC 1920 only - Oct lastSun 2:00 0 S
146 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
147 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
148 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
149 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
150 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
157 # US Central time, represented by Chicago
158 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
159 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
160 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
161 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
162 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
163 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
164 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
165 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
166 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
168 -6:00 Chicago C%sT 1936 Mar 1 2:00
169 -5:00 - EST 1936 Nov 15 2:00
170 -6:00 Chicago C%sT 1942
172 -6:00 Chicago C%sT 1967
175 # US Mountain time, represented by Denver
176 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
177 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
178 Rule Denver 1920 only - Oct lastSun 2:00 0 S
179 Rule Denver 1921 only - May 22 2:00 0 S
180 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
181 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
182 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
183 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
185 -7:00 Denver M%sT 1942
187 -7:00 Denver M%sT 1967
190 # US Pacific time, represented by Los Angeles
191 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
192 Rule CA 1948 only - Mar 14 2:00 1:00 D
193 Rule CA 1949 only - Jan 1 2:00 0 S
194 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
195 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
196 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
197 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
198 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
204 # AK%sT is the modern abbreviation for -9:00 per USNO.
206 # From Paul Eggert (1995-12-19):
207 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
208 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
209 # This was on 1867-10-18. We omit this transition, since we can't represent
210 # changes from Julian to Gregorian.
212 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
213 Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00
217 -8:00 US P%sT 1983 Oct 30 2:00
219 Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00
223 -9:00 US Y%sT 1983 Oct 30 2:00
225 Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00
227 -10:00 US CAT/CAWT 1946
228 -10:00 - CAT 1967 Apr
230 -10:00 US AH%sT 1983 Oct 30 2:00
232 Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00
235 -11:00 - NST 1967 Apr
237 -11:00 US B%sT 1983 Oct 30 2:00
239 Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00
242 -11:00 - NST 1967 Apr
244 -11:00 US B%sT 1983 Oct 30 2:00
246 # Shanks writes that part of southwest Alaska (e.g. Aniak)
247 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
248 # and another part (e.g. Akiak) made the same switch five weeks later.
249 # These switches don't quite make our 1970 cutoff.
253 # From Arthur David Olson:
254 # And then there's Hawaii.
255 # DST was observed for one day in 1933;
256 # standard time was changed by half an hour in 1947;
257 # it's always standard as of 1986.
260 # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
262 Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
263 -10:30 - HST 1933 Apr 30 2:00
264 -10:30 1:00 HDT 1933 May 21 2:00
265 -10:30 US H%sT 1947 Jun 8 2:00
268 # Now we turn to US areas that have diverged from the consensus since 1970.
270 # Arizona mostly uses MST.
271 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
272 -7:00 US M%sT 1944 Jan 1 00:01
273 -7:00 - MST 1944 Mar 17 00:01
274 -7:00 US M%sT 1944 Oct 1 00:01
278 # From Arthur David Olson (1988-02-13):
279 # A writer from the Inter Tribal Council of Arizona, Inc.,
280 # notes in private correspondence dated 12/28/87 that "Presently, only the
281 # Navajo Nation participates in the Daylight Saving Time policy, due to its
282 # large size and location in three states." (The "only" means that other
283 # tribal nations don't use DST.)
285 Link America/Denver America/Shiprock
287 # Southern Idaho and eastern Oregon switched four weeks late in 1974.
288 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
289 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
290 -8:00 US P%sT 1923 May 13 2:00
292 -7:00 - MST 1974 Feb 3 2:00
297 # From Paul Eggert (1995-12-19):
298 # Indiana generally observes either EST all year, or CST/CDT,
299 # but areas near Cincinnati and Louisville use those cities' timekeeping
300 # and in 1969 and 1970 the whole state observed daylight time;
301 # and there are other exceptions as noted below.
302 # Shanks partitions Indiana into 345 regions, each with its own time history,
303 # and writes ``Even newspaper reports present contradictory information.''
304 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
306 # Since 1970, EST-only Indiana has been like America/Indianapolis,
307 # with exceptions noted below for Crawford, Starke, and Switzerland counties.
308 # The parts of Indiana not listed below have been like America/Chicago,
309 # America/Louisville, or America/New_York.
311 # Other than Indianapolis, the Indiana place names are so nondescript
312 # that they would be ambiguous if we left them at the `America' level.
313 # So we reluctantly put them all in a subdirectory `America/Indiana'.
315 # Most of EST-only Indiana last observed DST in 1970.
316 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
317 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
318 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
319 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
320 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
321 Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
323 -6:00 Indianapolis C%sT 1942
325 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
326 -5:00 - EST 1957 Sep 29 2:00
327 -6:00 - CST 1958 Apr 27 2:00
331 Link America/Indianapolis America/Indiana/Indianapolis
333 # Part of Crawford County, Indiana, last observed DST in 1975,
334 # and left its clocks alone in 1974.
335 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
336 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
337 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
338 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
339 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
340 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
341 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
343 -6:00 Marengo C%sT 1961 Apr 30 2:00
345 -5:00 US E%sT 1974 Jan 6 2:00
346 -6:00 1:00 CDT 1974 Oct 27 2:00
350 # Starke County, Indiana
351 # From Arthur David Olson (1991-10-28):
352 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
353 # notes that Starke County switched from Central time to Eastern time as of
355 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
356 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
357 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
358 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
359 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
360 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
361 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
362 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
364 -6:00 Starke C%sT 1962 Apr 29 2:00
365 -5:00 - EST 1963 Oct 27 2:00
366 -6:00 US C%sT 1991 Oct 27 2:00
369 # Switzerland County, Indiana, last observed DST in 1972.
370 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
371 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
372 -6:00 US C%sT 1954 Apr 25 2:00
377 # Part of Kentucky left its clocks alone in 1974.
378 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
379 Rule Louisville 1921 only - May 1 2:00 1:00 D
380 Rule Louisville 1921 only - Sep 1 2:00 0 S
381 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
382 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
383 Rule Louisville 1946 only - Jun 2 2:00 0 S
384 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
385 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
386 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
387 Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
389 -6:00 Louisville C%sT 1942
391 -6:00 Louisville C%sT 1961 Jul 23 2:00
393 -5:00 US E%sT 1974 Jan 6 2:00
394 -6:00 1:00 CDT 1974 Oct 27 2:00
399 # From Bob Devine (1988-01-28):
400 # Michigan didn't observe DST from 1968 to 1973.
402 # From Paul Eggert (1995-12-19):
403 # Shanks writes that Michigan started using standard time on 1885 Sep 18,
404 # but Howse (p 126) writes that Detroit kept
406 # local time until 1900 when the City Council decreed that clocks should
407 # be put back twenty-eight minutes to Central Standard Time. Half the
408 # city obeyed, half refused. After considerable debate, the decision
409 # was rescinded and the city reverted to Sun time. A derisive offer to
410 # erect a sundial in front of the city hall was referred to the
411 # Committee on Sewers. Then, in 1905, Central time was adopted
414 # This story is too entertaining to be false, so go with Howse over Shanks.
416 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
417 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
418 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
419 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
420 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
421 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
422 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
423 Zone America/Detroit -5:32:11 - LMT 1905
424 -6:00 - CST 1915 May 15 2:00
427 -5:00 Detroit E%sT 1973
429 -5:00 - EST 1975 Apr 27 2:00
432 # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
433 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
434 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
435 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
436 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
437 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
438 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
439 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
441 -6:00 Menominee C%sT 1969 Apr 27 2:00
442 -5:00 - EST 1973 Apr 29 2:00
446 # claimed by US under the provisions of the 1856 Guano Islands Act
447 # also claimed by Haiti
448 # occupied 1857/1900 by the Navassa Phosphate Co
449 # US lighthouse 1917/1997-01
450 # currently uninhabited
451 # see Mark Fineman, ``An Isle Rich in Guano and Discord'',
452 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
453 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
455 # Old names, for S5 users
457 # Link LINK-FROM LINK-TO
458 Link America/New_York EST5EDT
459 Link America/Chicago CST6CDT
460 Link America/Denver MST7MDT
461 Link America/Los_Angeles PST8PDT
462 Link America/Indianapolis EST
463 Link America/Phoenix MST
464 Link Pacific/Honolulu HST
466 ################################################################################
469 # From Paul Eggert <eggert@twinsun.com> (1996-11-22):
470 # A good source for time zone historical data outside the US is
471 # Thomas G. Shanks, The International Atlas (4th edition),
472 # San Diego: ACS Publications, Inc. (1995).
474 # Gwillim Law <LAW@encmail.encompass.com> writes that a good source
475 # for recent time zone data is the International Air Transport
476 # Association's Standard Schedules Information Manual (IATA SSIM),
477 # published semiannually. Law sent in several helpful summaries
478 # of the IATA's data after 1990.
480 # Except where otherwise noted, Shanks is the source for entries through 1990,
481 # and IATA SSIM is the source for entries after 1990.
483 # Another source occasionally used is Edward W. Whitman, World Time Differences,
484 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
485 # I found in the UCLA library.
487 # See the `europe' file for Greenland.
491 # From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
492 # I post here the time zone abbreviations standardized in Canada
493 # for both English and French in the CAN/CSA-Z234.4-89 standard....
495 # UTC Standard time Daylight savings time
496 # offset French English French English
507 # HN: Heure Normale ST: Standard Time
508 # HA: Heure Avanc<e'>e DT: Daylight saving Time
510 # A: de l'Atlantique Atlantic
511 # C: du Centre Central
512 # E: de l'Est Eastern
515 # P: du Pacifique Pacific
520 # From Paul Eggert <eggert@twinsun.com> (1994-11-22):
521 # Alas, this sort of thing must be handled by localization software.
523 # The data for Canada are all from Shanks (1991).
526 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
527 Rule Canada 1918 only - Apr 14 2:00 1:00 D
528 Rule Canada 1918 only - Oct 31 2:00 0 S
529 Rule Canada 1942 only - Feb 9 2:00 1:00 D
530 Rule Canada 1945 only - Sep 30 2:00 0 S
531 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
532 Rule Canada 1974 max - Oct lastSun 2:00 0 S
533 Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
536 # Newfoundland (except Labrador)
538 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
539 Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
540 Rule StJohns 1917 only - Sep 17 2:00 0 S
541 Rule StJohns 1918 only - Oct 31 2:00 0 S
542 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
543 Rule StJohns 1919 only - May 5 23:00 1:00 D
544 Rule StJohns 1919 only - Aug 12 23:00 0 S
545 # For 1931-1935 Whitman gives Apr same date; go with Shanks.
546 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
547 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
548 # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
549 Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
550 Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
551 # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
552 Rule StJohns 1942 only - Mar 1 0:00 1:00 D
553 Rule StJohns 1942 only - Dec 31 0:00 0 S
554 Rule StJohns 1943 only - May 30 0:00 1:00 D
555 Rule StJohns 1943 only - Sep 5 0:00 0 S
556 Rule StJohns 1944 only - Jul 10 0:00 1:00 D
557 Rule StJohns 1944 only - Sep 2 0:00 0 S
558 Rule StJohns 1945 only - Jan 1 0:00 1:00 D
559 Rule StJohns 1945 only - Oct 7 2:00 0 S
560 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
561 # Apr 30 - Sep 24; go with Shanks.
562 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
563 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
564 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
565 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
566 Rule StJohns 1960 max - Oct lastSun 2:00 0 S
567 Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
568 Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD
569 Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
570 # St John's has an apostrophe, but Posix file names can't have apostrophes.
571 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
572 Zone America/St_Johns -3:30:52 - LMT 1884
573 -3:30:52 StJohns N%sT 1935 Mar 30
579 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
580 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
581 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
582 -3:30:52 StJohns NST 1919
583 -3:30:52 - NST 1935 Mar 30
585 -3:30 StJohns N%sT 1966 Mar 15 2:00
589 # west Labrador, New Brunswick, Nova Scotia, Prince Edward I
591 # From Paul Eggert (1996-06-12):
592 # Shanks writes that since 1970 most of this region has been like Halifax.
593 # Many locales did not observe peacetime DST until 1972;
594 # Glace Bay, NS is the largest that we know of.
595 # Shanks also writes that Liverpool, NS was the only town in Canada to observe
596 # DST in 1971 but not 1970; for now we'll assume this is a typo.
598 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
599 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
600 Rule Halifax 1916 only - Oct 1 0:00 0 S
601 Rule Halifax 1918 only - Apr 14 2:00 1:00 D
602 Rule Halifax 1918 only - Oct 31 2:00 0 S
603 Rule Halifax 1920 only - May 9 0:00 1:00 D
604 Rule Halifax 1920 only - Aug 29 0:00 0 S
605 Rule Halifax 1921 only - May 6 0:00 1:00 D
606 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
607 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
608 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
609 Rule Halifax 1923 only - Sep 4 0:00 0 S
610 Rule Halifax 1924 only - Sep 15 0:00 0 S
611 Rule Halifax 1925 only - Sep 28 0:00 0 S
612 Rule Halifax 1926 only - May 16 0:00 1:00 D
613 Rule Halifax 1926 only - Sep 13 0:00 0 S
614 Rule Halifax 1927 only - May 1 0:00 1:00 D
615 Rule Halifax 1927 only - Sep 26 0:00 0 S
616 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
617 Rule Halifax 1928 only - Sep 9 0:00 0 S
618 Rule Halifax 1929 only - Sep 3 0:00 0 S
619 Rule Halifax 1930 only - Sep 15 0:00 0 S
620 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
621 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
622 Rule Halifax 1933 only - Oct 2 0:00 0 S
623 Rule Halifax 1934 only - May 20 0:00 1:00 D
624 Rule Halifax 1934 only - Sep 16 0:00 0 S
625 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
626 Rule Halifax 1935 only - Sep 30 0:00 0 S
627 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
628 Rule Halifax 1936 only - Sep 14 0:00 0 S
629 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
630 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
631 Rule Halifax 1939 only - May 28 0:00 1:00 D
632 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
633 Rule Halifax 1942 only - Feb 9 2:00 1:00 D
634 Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
635 Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
636 Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
637 Rule Halifax 1962 max - Oct lastSun 2:00 0 S
638 Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
639 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
640 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
642 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
643 -4:00 Canada A%sT 1953
644 -4:00 Halifax A%sT 1954
651 # From Paul Eggert (1996-06-12):
652 # Shanks writes that since 1970 most of this region has been like Montreal.
653 # Thunder Bay skipped DST in 1973.
654 # Many smaller locales did not observe peacetime DST until 1974;
655 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
656 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
658 # From Paul Eggert (1997-10-17):
659 # msb@sq.com writes that an article in the 1997-10-14 Toronto Star
660 # says that Atikokan, Ontario currently does not observe DST,
661 # but will vote on 11-10 whether to use EST/EDT.
662 # He also writes that the
663 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
664 # Ontario Time Act (1990, Chapter T.9)
666 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
667 # Officially Atikokan is therefore on CST/CDT, and most likely this report
668 # concerns a non-official time observed as a matter of local practice.
669 # For what it's worth, Shanks (1995) says that Atikokan has agreed with
670 # Rainy River ever since standard time was introduced.
672 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
673 Rule Mont 1917 only - Mar 25 2:00 1:00 D
674 Rule Mont 1917 only - Apr 24 0:00 0 S
675 Rule Mont 1918 only - Apr 14 2:00 1:00 D
676 Rule Mont 1918 only - Oct 31 2:00 0 S
677 Rule Mont 1919 only - Mar 31 2:30 1:00 D
678 Rule Mont 1919 only - Oct 25 2:30 0 S
679 Rule Mont 1920 only - May 2 2:30 1:00 D
680 Rule Mont 1920 only - Oct 3 2:30 0 S
681 Rule Mont 1921 only - May 1 2:00 1:00 D
682 Rule Mont 1921 only - Oct 2 2:30 0 S
683 Rule Mont 1922 only - Apr 30 2:00 1:00 D
684 Rule Mont 1922 only - Oct 1 2:30 0 S
685 Rule Mont 1924 only - May 17 2:00 1:00 D
686 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
687 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
688 Rule Mont 1927 only - May 1 0:00 1:00 D
689 Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
690 Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
691 Rule Mont 1932 only - May 1 0:00 1:00 D
692 Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
693 Rule Mont 1933 only - Oct 1 0:00 0 S
694 Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
695 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
696 Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
697 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
698 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
699 Rule Mont 1957 max - Oct lastSun 2:00 0 S
700 Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
701 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
702 Zone America/Montreal -4:54:16 - LMT 1884
704 Zone America/Thunder_Bay -5:57:00 - LMT 1895
705 -5:00 Canada E%sT 1970
709 Zone America/Nipigon -5:53:04 - LMT 1895
711 Zone America/Rainy_River -6:17:56 - LMT 1895
717 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
718 Rule Winn 1916 only - Apr 23 0:00 1:00 D
719 Rule Winn 1916 only - Sep 17 0:00 0 S
720 Rule Winn 1918 only - Apr 14 2:00 1:00 D
721 Rule Winn 1918 only - Oct 31 2:00 0 S
722 Rule Winn 1937 only - May 16 2:00 1:00 D
723 Rule Winn 1937 only - Sep 26 2:00 0 S
724 Rule Winn 1942 only - Feb 9 2:00 1:00 D
725 Rule Winn 1945 only - Sep lastSun 2:00 0 S
726 Rule Winn 1946 only - May 12 2:00 1:00 D
727 Rule Winn 1946 only - Oct 13 2:00 0 S
728 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
729 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
730 Rule Winn 1950 only - May 1 2:00 1:00 D
731 Rule Winn 1950 only - Sep 30 2:00 0 S
732 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
733 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
734 Rule Winn 1959 only - Oct lastSun 2:00 0 S
735 Rule Winn 1960 only - Sep lastSun 2:00 0 S
736 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
737 Rule Winn 1963 only - Sep 22 2:00 0 S
738 Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
739 Rule Winn 1966 max - Oct lastSun 2:00 0 S
740 Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
741 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
742 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
748 # From Paul Eggert (1996-06-12):
749 # Shanks writes that since 1970 most of this region has been like Regina.
750 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
751 # Other western towns (e.g. Lloydminster) are like Edmonton.
753 # From W. Jones <jones@skdad.usask.ca> (1992-11-06):
754 # The. . .below is based on information I got from our law library, the
755 # provincial archives, and the provincial Community Services department.
756 # A precise history would require digging through newspaper archives, and
757 # since you didn't say what you wanted, I didn't bother.
759 # Saskatchewan is split by a time zone meridian (105W) and over the years
760 # the boundary became pretty ragged as communities near it reevaluated
761 # their affiliations in one direction or the other. In 1965 a provincial
762 # referendum favoured legislating common time practices.
764 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
765 # Saskatchewan 1978) was proclaimed, and established that the eastern
766 # part of Saskatchewan would use CST year round, that districts in
767 # northwest Saskatchewan would by default follow CST but could opt to
768 # follow Mountain Time rules (thus 1 hour difference in the winter and
769 # zero in the summer), and that districts in southwest Saskatchewan would
770 # by default follow MT but could opt to follow CST.
772 # It took a few years for the dust to settle (I know one story of a town
773 # on one time zone having its school in another, such that a mom had to
774 # serve her family lunch in two shifts), but presently it seems that only
775 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
776 # rules any more; all other districts appear to have used CST year round
777 # since sometime in the 1960s.
779 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
780 Rule Regina 1918 only - Apr 14 2:00 1:00 D
781 Rule Regina 1918 only - Oct 31 2:00 0 S
782 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
783 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
784 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
785 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
786 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
787 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
788 Rule Regina 1942 only - Feb 9 2:00 1:00 D
789 Rule Regina 1945 only - Sep lastSun 2:00 0 S
790 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
791 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
792 Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
793 Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
794 Rule Regina 1959 only - Oct lastSun 2:00 0 S
796 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
797 Rule Swift 1957 only - Oct lastSun 2:00 0 S
798 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
799 Rule Swift 1959 only - Oct lastSun 2:00 0 S
800 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
801 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
802 Zone America/Regina -6:58:36 - LMT 1905 Sep
803 -7:00 Regina M%sT 1960 Apr lastSun 2:00
805 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
806 -7:00 Canada M%sT 1946 Apr lastSun 2:00
807 -7:00 Regina M%sT 1950
808 -7:00 Swift M%sT 1972 Apr lastSun 2:00
814 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
815 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
816 Rule Edm 1918 only - Oct 31 2:00 0 S
817 Rule Edm 1919 only - May 27 2:00 0 S
818 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
819 Rule Edm 1920 only - Oct lastSun 2:00 0 S
820 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
821 Rule Edm 1942 only - Feb 9 2:00 1:00 D
822 Rule Edm 1945 only - Sep lastSun 2:00 0 S
823 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
824 Rule Edm 1947 only - Sep lastSun 2:00 0 S
825 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
826 Rule Edm 1967 only - Oct lastSun 2:00 0 S
827 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
828 Rule Edm 1969 only - Oct lastSun 2:00 0 S
829 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
830 Rule Edm 1972 max - Oct lastSun 2:00 0 S
831 Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
832 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
833 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
839 # From Paul Eggert (1996-06-12):
840 # Shanks writes that since 1970 most of this region has been like Vancouver.
841 # Dawswon Creek uses MST. Much of east BC is like Edmonton.
843 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
844 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
845 Rule Vanc 1918 only - Oct 31 2:00 0 S
846 Rule Vanc 1942 only - Feb 9 2:00 1:00 D
847 Rule Vanc 1945 only - Sep 30 2:00 0 S
848 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
849 Rule Vanc 1946 only - Oct 13 2:00 0 S
850 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
851 Rule Vanc 1962 max - Oct lastSun 2:00 0 S
852 Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
853 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
854 Zone America/Vancouver -8:12:28 - LMT 1884
856 Zone America/Dawson_Creek -8:00:56 - LMT 1884
857 -8:00 Canada P%sT 1947
858 -8:00 Vanc P%sT 1972 Aug 30 2:00
862 # Northwest Territories, Yukon
864 # From Paul Eggert (1996-10-07):
865 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
866 # Shanks's table for Watson Lake is corrupted, so we have no data there.
867 # Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
868 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
869 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
870 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
871 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
872 # * O.I.C. 1980/02 established DST.
873 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
874 # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
876 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
877 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
878 Rule NT_YK 1918 only - Oct 27 2:00 0 S
879 Rule NT_YK 1919 only - May 25 2:00 1:00 D
880 Rule NT_YK 1919 only - Nov 1 0:00 0 S
881 Rule NT_YK 1942 only - Feb 9 2:00 1:00 D
882 Rule NT_YK 1945 only - Sep 30 2:00 0 S
883 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
884 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
885 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
886 Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
887 Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
888 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
889 Zone America/Pangnirtung -4:22:56 - LMT 1884
891 Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay
893 Zone America/Rankin_Inlet -6:08:40 - LMT 1884
895 Zone America/Yellowknife -7:37:24 - LMT 1884
897 Zone America/Inuvik -8:54:00 - LMT 1884
898 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
900 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
901 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
903 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
904 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
908 ###############################################################################
913 # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
914 # Rules [before] 1987 are unknown.
915 # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
916 # observe DST." This is presumably Baja California Norte, above 28th parallel,
917 # as listed there; [there is also] "Baja California Sur and N. Pacific
918 # Coast (States of Sinaloa and Sonora)."
920 # From Bob Devine (1988-01-28):
921 # The Federal District (where Mexico City is) has observed [DST] several
922 # times but not recently.
924 # I don't where to drawn the line in the North Baja area. 28th latitude
925 # sounds good -- but it may be higher (how far [d]o radio stations from
926 # San Diego affect culture?).
928 # The dates of DST probably go back to 1981. The rules are the same as
929 # US's. This is going to be a headache for US presidential electi[o]n years!
931 # From Arthur David Olson (1988-02-13)
932 # Since the 1981 starting date is only "probable," we'll keep the 1987
933 # starting date below.
935 # From U. S. Naval Observatory (1989-01-19):
936 # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
937 # MEXICO BAJA CAL N N. PACIFIC COAST (STATES
938 # MEXICO BAJA CAL N OF SINALOA AND SONORA)
939 # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
940 # MEXICO BAJA CAL N - OCT 29
941 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
942 # MEXICO BAJA CAL N - 0CT 29
943 # MEXICO 6 H BEHIND UTC STATES OF DURANGO,
944 # MEXICO COAHUILA, NUEVO LEON,
946 # MEXICO 5 H BEHIND UTC STATES OF DURANGO,
947 # MEXICO COAHUILA, NUEVO LEON,
948 # MEXICO TAMAULIPAS APR 3 - OCT 29
949 # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
950 # MEXICO CAMPECHE, QUINTANA ROO AND
953 # From Arthur David Olson (1989-01-21):
954 # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
955 # USNO claims there should be four Mexican zones rather than three:
956 # a zone that's GMT-8 with DST; a zone that's always GMT-7;
957 # a zone that's GMT-6 with DST; and a zone that's always GMT-6.
959 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
960 # Shanks also says there are four zones, but disagrees about the fourth.
961 # Instead of GMT-6 with DST, he says there's GMT-8 without DST.
963 # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
964 # A guy from our Mexico subsidiary finally found the Presidential Decree
965 # outlining the timezone changes in Mexico.
967 # ------------- Begin Forwarded Message -------------
969 # I finally got my hands on the Official Presidential Decree that sets up the
970 # rules for the DST changes. The rules are:
972 # 1. The country is divided in 3 timezones:
973 # - Baja California Norte (the Mexico/BajaNorte TZ)
974 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
975 # - The rest of the country (the Mexico/General TZ)
977 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
978 # at 2:00 AM, the times in each zone are as follows:
983 # 3. The rest of the year, the times are as follows:
988 # The Decree was published in Mexico's Official Newspaper on January 4th.
990 # -------------- End Forwarded Message --------------
991 # From Paul Eggert (1996-06-12):
992 # For an English translation of the decree, see
993 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
994 # ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
997 # From Rives McDow (1998-10-08):
998 # The State of Quintana Roo has reverted back to central STD and DST times
999 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
1001 # From Shanks (1991):
1002 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1003 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1004 Rule Mexico 1939 only - Jun 25 0:00 0 S
1005 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1006 Rule Mexico 1941 only - Apr 1 0:00 0 S
1007 Rule Mexico 1943 only - Dec 16 0:00 1:00 D
1008 Rule Mexico 1944 only - May 1 0:00 0 S
1009 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1010 Rule Mexico 1950 only - Jul 30 0:00 0 S
1011 Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
1012 Rule Mexico 1996 max - Oct lastSun 2:00 0 S
1014 Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
1015 Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
1016 Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
1017 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1019 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 1:12:42
1021 -6:00 Mexico C%sT 1997 Oct lastSun 2:00
1022 -5:00 Mexico E%sT 1998 Aug 2 2:00
1025 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1026 -7:00 - MST 1927 Jun 10 23:00
1027 -6:00 - CST 1930 Nov 15
1028 -7:00 - MST 1931 May 1 23:00
1029 -6:00 - CST 1931 Oct
1030 -7:00 - MST 1932 Mar 30 23:00
1033 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:44
1034 -7:00 - MST 1927 Jun 10 23:00
1035 -6:00 - CST 1930 Nov 15
1036 -7:00 - MST 1931 May 1 23:00
1037 -6:00 - CST 1931 Oct
1038 -7:00 - MST 1932 Mar 30 23:00
1040 -6:00 Mexico C%sT 1998
1041 -6:00 - CST 1998 Apr Sun>=1 3:00
1043 # S Baja California, Nayarit, Sinaloa, Sonora
1044 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1045 -7:00 - MST 1927 Jun 10 23:00
1046 -6:00 - CST 1930 Nov 15
1047 -7:00 - MST 1931 May 1 23:00
1048 -6:00 - CST 1931 Oct
1049 -7:00 - MST 1932 Mar 30 23:00
1050 -6:00 - CST 1942 Apr
1051 -7:00 - MST 1949 Jan 14
1055 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1056 -8:00 - PST 1927 Jun 10 23:00
1057 -7:00 - MST 1930 Nov 16
1058 -8:00 - PST 1942 Apr
1059 -7:00 - MST 1949 Jan 14
1060 -8:00 BajaN P%sT 1967 Apr lastSun 2:00
1064 Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
1065 -8:00 - PST 1927 Jun 10 23:00
1066 -7:00 - MST 1930 Nov 16
1067 -8:00 - PST 1942 Apr
1068 -7:00 - MST 1949 Jan 14
1075 ###############################################################################
1078 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1079 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1082 # Antigua and Barbuda
1083 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1084 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1089 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1090 Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1091 Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1092 Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1093 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1094 Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1098 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1099 Rule Barb 1977 only - Jun 12 2:00 1:00 D
1100 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1101 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1102 Rule Barb 1979 only - Sep 30 2:00 0 S
1103 Rule Barb 1980 only - Sep 25 2:00 0 S
1104 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1105 Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1106 -3:58:28 - BMT 1932 # Bridgetown Mean Time
1110 # Whitman entirely disagrees with Shanks; go with Shanks.
1111 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1112 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1113 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1114 Rule Belize 1973 only - Dec 5 0:00 1:00 D
1115 Rule Belize 1974 only - Feb 9 0:00 0 S
1116 Rule Belize 1982 only - Dec 18 0:00 1:00 D
1117 Rule Belize 1983 only - Feb 12 0:00 0 S
1118 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1119 Zone America/Belize -5:52:48 - LMT 1912 Apr
1123 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1124 Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1125 -4:00 - AST 1974 Apr 28 2:00
1129 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1130 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1131 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1135 # Shanks gives some very odd dates for 1991, and stops there.
1136 # For now, we won't guess further.
1137 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1138 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1139 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1140 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1141 # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1142 Rule CR 1991 only - Jul 1 0:00 0 S
1143 Rule CR 1992 only - Mar 15 0:00 0 S
1144 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1145 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1146 Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1147 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
1150 # no information; probably like America/Costa_Rica
1154 # From Bob Devine (1988-01-28):
1155 # . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
1156 # Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
1159 # From U. S. Naval Observatory (1989-01-19):
1160 # CUBA 5 H BEHIND UTC
1161 # CUBA 4 H BEHIND UTC MAR 20 - OCT 8
1163 # From Shanks (1991):
1164 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1165 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1166 Rule Cuba 1928 only - Oct 10 0:00 0 S
1167 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1168 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1169 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1170 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1171 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1172 Rule Cuba 1965 only - Sep 30 0:00 0 S
1173 Rule Cuba 1966 only - May 29 0:00 1:00 D
1174 Rule Cuba 1966 only - Oct 2 0:00 0 S
1175 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1176 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1177 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1178 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1179 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1180 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1181 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1182 Rule Cuba 1978 only - May 7 0:00 1:00 D
1183 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1184 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1185 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1186 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1187 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
1188 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1189 Rule Cuba 1996 only - Oct 6 0:00s 0 S
1190 Rule Cuba 1997 only - Oct 12 0:00s 0 S
1191 Rule Cuba 1998 only - Mar 29 0:00 1:00 D
1192 Rule Cuba 1998 max - Oct lastSun 0:00s 0 S
1193 Rule Cuba 1999 max - Apr Sun>=1 0:00s 1:00 D
1195 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1196 Zone America/Havana -5:29:28 - LMT 1890
1197 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT
1201 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1202 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1205 # Dominican Republic
1206 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1207 Rule DR 1966 only - Oct 30 0:00 1:00 D
1208 Rule DR 1967 only - Feb 28 0:00 0 S
1209 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1210 Rule DR 1970 only - Feb 21 0:00 0 S
1211 Rule DR 1971 only - Jan 20 0:00 0 S
1212 Rule DR 1972 1974 - Jan 21 0:00 0 S
1213 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1214 Zone America/Santo_Domingo -4:39:36 - LMT 1890
1215 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1216 -5:00 DR E%sT 1974 Oct 27
1220 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1221 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1222 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1223 # There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1224 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1225 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1229 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1230 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1234 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1235 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1239 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1240 Rule Guat 1973 only - Nov 25 0:00 1:00 D
1241 Rule Guat 1974 only - Feb 24 0:00 0 S
1242 Rule Guat 1983 only - May 21 0:00 1:00 D
1243 Rule Guat 1983 only - Sep 22 0:00 0 S
1244 Rule Guat 1991 only - Mar 23 0:00 1:00 D
1245 Rule Guat 1991 only - Sep 7 0:00 0 S
1246 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1247 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1251 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1252 Rule Haiti 1983 only - May 8 0:00 1:00 D
1253 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1254 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1255 # Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA.
1256 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
1257 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
1258 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1259 Zone America/Port-au-Prince -4:49:20 - LMT 1890
1260 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1264 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1265 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1266 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1269 # Great Swan I ceded by US to Honduras in 1972
1273 # From Bob Devine (1988-01-28):
1276 # From U. S. Naval Observatory (1989-01-19):
1277 # JAMAICA 5 H BEHIND UTC
1279 # From Shanks (1991):
1280 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1281 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1282 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1283 -5:00 - EST 1974 Jan 6 2:00
1288 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1289 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1290 -4:04 - FFMT 1911 May # Fort-de-France MT
1291 -4:00 - AST 1980 Apr 6
1292 -4:00 1:00 ADT 1980 Sep 28
1296 # From Paul Eggert (1997-08-31):
1297 # Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
1298 # Luckily, Olveston, the current de facto capital, has the same longitude.
1299 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1300 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
1305 # From Steffen Thorsen (1998-12-29):
1306 # Nicaragua seems to be back at -6:00 but I have not been able to find when
1307 # they changed from -5:00.
1309 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1310 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1311 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1312 Rule Nic 1992 only - Jan 1 4:00 1:00 D
1313 Rule Nic 1992 only - Sep 24 0:00 0 S
1314 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1315 Zone America/Managua -5:45:08 - LMT 1890
1316 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
1317 -6:00 - CST 1973 May
1318 -5:00 - EST 1975 Feb 16
1319 -6:00 Nic C%sT 1993 Jan 1 4:00
1320 -5:00 - EST 1998 Dec
1324 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1325 Zone America/Panama -5:18:08 - LMT 1890
1326 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
1330 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1331 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1332 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1333 -4:00 - AST 1942 May 3
1334 -4:00 1:00 AWT 1945 Sep 30 2:00
1338 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1339 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1343 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1344 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1345 -4:04 - CMT 1912 # Castries Mean Time
1348 # St Pierre and Miquelon
1349 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1350 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1351 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1352 -4:00 - AST 1980 May
1353 -3:00 Mont PM%sT # Pierre & Miquelon Time
1355 # St Vincent and the Grenadines
1356 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1357 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1358 -4:04:56 - KMT 1912 # Kingstown Mean Time
1362 # From Paul Eggert (1998-08-06):
1363 # Shanks says they use US DST rules, but IATA SSIM (1991/1998)
1364 # says they switch at midnight. Go with IATA SSIM.
1365 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1366 Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1367 Rule TC 1979 max - Oct lastSun 0:00 0 S
1368 Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1369 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1370 Zone America/Grand_Turk -4:44:32 - LMT 1890
1371 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1375 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1376 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1380 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1381 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
projects / platform / upstream / glibc.git / blob