1 # @(#)northamerica 7.47
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> (1999-03-22):
9 # A reliable and entertaining source about time zones is
10 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
12 ###############################################################################
16 # From Paul Eggert (1999-03-31):
17 # Howse writes (pp 121-125) that time zones were invented by
18 # Professor Charles Ferdinand Dowd (1825-1904),
19 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
20 # His pamphlet ``A System of National Time for Railroads'' (1870)
21 # was the result of his proposals at the Convention of Railroad Trunk Lines
22 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
23 # but in 1872-05 he moved the proposed origin to Greenwich.
24 # His proposal was adopted by the railroads on 1883-11-18 at 12:00,
25 # and the most of the country soon followed suit.
27 # From Paul Eggert <eggert@twinsun.com> (1995-12-19):
28 # A good source for time zone historical data in the US is
29 # Thomas G. Shanks, The American Atlas (5th edition),
30 # San Diego: ACS Publications, Inc. (1991).
31 # Make sure you have the errata sheet; the book is somewhat useless without it.
32 # It is the source for the US and Puerto Rico entries below.
34 # From Paul Eggert (1996-06-12):
35 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
36 # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784).
37 # Not everyone is happy with the results:
39 # I don't really care how time is reckoned so long as there is some
40 # agreement about it, but I object to being told that I am saving
41 # daylight when my reason tells me that I am doing nothing of the kind.
42 # I even object to the implication that I am wasting something
43 # valuable if I stay in bed after the sun has risen. As an admirer
44 # of moonlight I resent the bossy insistence of those who want to
45 # reduce my time for enjoying it. At the back of the Daylight Saving
46 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
47 # to push people into bed earlier, and get them up earlier, to make
48 # them healthy, wealthy and wise in spite of themselves.
50 # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
52 # From Arthur David Olson:
53 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
54 # See, for example, the front page of the Saturday, 1974-10-26
55 # and Sunday, 1974-10-27 editions of the Washington Post.
57 # From Arthur David Olson:
58 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
59 # Daylight Saving Time in the US was by local option, except during wartime.
61 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
62 Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War
63 Rule US 1918 1919 - Oct lastSun 2:00 0 S
64 Rule US 1942 only - Feb 9 2:00 1:00 W # War
65 Rule US 1945 only - Sep 30 2:00 0 S
66 Rule US 1967 max - Oct lastSun 2:00 0 S
67 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
68 Rule US 1974 only - Jan 6 2:00 1:00 D
69 Rule US 1975 only - Feb 23 2:00 1:00 D
70 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
71 Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
72 # <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:">
74 # </a> (introduced 1999-01-06) would change April to March in the above rule.
76 # From Bob Devine (1988-01-28):
77 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
79 # Pacific Standard Time(PST) -same-
80 # Yukon Standard Time(YST) -same-
81 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
82 # Nome Standard Time (NT) Bering Standard Time (BST)
84 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
85 # The YST zone now covers nearly all of the state, AHST just part
86 # of the Aleutian islands. No DST.
88 # From Paul Eggert (1995-12-19):
89 # The tables below use `NST', not `NT', for Nome Standard Time.
90 # I invented `CAWT' for Central Alaska War Time.
92 # From U. S. Naval Observatory (1989-01-19):
93 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
94 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
95 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
96 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
97 # USA MOUNTAIN 7 H BEHIND UTC DENVER
98 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
99 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
100 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
101 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
102 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
103 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
104 # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
105 # USA HAWAII 10 H BEHIND UTC
106 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
108 # From Arthur David Olson (1989-01-21):
109 # The above dates are for 1988.
110 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
111 # no DST in Samoa, and the claim that there is DST in Alaska and the
114 # From Arthur David Olson (1988-02-13):
115 # Legal standard time zone names, from United States Code (1982 Edition and
116 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
117 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
118 # took effect), as explained in sections 263 and 261:
120 # United States standard eastern time
121 # United States standard mountain time
122 # United States standard central time
123 # United States standard Pacific time
125 # United States standard Alaska time
127 # Next, names from 1967-04-01 until 1983-11-30 (the date for
128 # public law 98-181):
129 # Atlantic standard time
130 # eastern standard time
131 # central standard time
132 # mountain standard time
133 # Pacific standard time
134 # Yukon standard time
135 # Alaska-Hawaii standard time
136 # Bering standard time
137 # And after 1983-11-30:
138 # Atlantic standard time
139 # eastern standard time
140 # central standard time
141 # mountain standard time
142 # Pacific standard time
143 # Alaska standard time
144 # Hawaii-Aleutian standard time
145 # Samoa standard time
146 # The law doesn't give abbreviations.
148 # From Paul Eggert (1995-12-19):
149 # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
152 # US Eastern time, represented by New York
153 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
154 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
155 Rule NYC 1920 only - Oct lastSun 2:00 0 S
156 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
157 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
158 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
159 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
160 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
167 # US Central time, represented by Chicago
168 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
169 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
170 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
171 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
172 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
173 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
174 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
175 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
176 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
178 -6:00 Chicago C%sT 1936 Mar 1 2:00
179 -5:00 - EST 1936 Nov 15 2:00
180 -6:00 Chicago C%sT 1942
182 -6:00 Chicago C%sT 1967
185 # US Mountain time, represented by Denver
186 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
187 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
188 Rule Denver 1920 only - Oct lastSun 2:00 0 S
189 Rule Denver 1921 only - May 22 2:00 0 S
190 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
191 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
192 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
193 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
195 -7:00 Denver M%sT 1942
197 -7:00 Denver M%sT 1967
200 # US Pacific time, represented by Los Angeles
201 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
202 Rule CA 1948 only - Mar 14 2:00 1:00 D
203 Rule CA 1949 only - Jan 1 2:00 0 S
204 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
205 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
206 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
207 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
208 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
214 # AK%sT is the modern abbreviation for -9:00 per USNO.
216 # From Paul Eggert (1995-12-19):
217 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
218 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
219 # This was on 1867-10-18. We omit this transition, since we can't represent
220 # changes from Julian to Gregorian.
222 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
223 Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00
227 -8:00 US P%sT 1983 Oct 30 2:00
229 Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00
233 -9:00 US Y%sT 1983 Oct 30 2:00
235 Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00
237 -10:00 US CAT/CAWT 1946
238 -10:00 - CAT 1967 Apr
240 -10:00 US AH%sT 1983 Oct 30 2:00
242 Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00
245 -11:00 - NST 1967 Apr
247 -11:00 US B%sT 1983 Oct 30 2:00
249 Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00
252 -11:00 - NST 1967 Apr
254 -11:00 US B%sT 1983 Oct 30 2:00
256 # Shanks writes that part of southwest Alaska (e.g. Aniak)
257 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
258 # and another part (e.g. Akiak) made the same switch five weeks later.
259 # These switches don't quite make our 1970 cutoff.
263 # From Arthur David Olson:
264 # And then there's Hawaii.
265 # DST was observed for one day in 1933;
266 # standard time was changed by half an hour in 1947;
267 # it's always standard as of 1986.
270 # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
272 Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
273 -10:30 - HST 1933 Apr 30 2:00
274 -10:30 1:00 HDT 1933 May 21 2:00
275 -10:30 US H%sT 1947 Jun 8 2:00
278 # Now we turn to US areas that have diverged from the consensus since 1970.
280 # Arizona mostly uses MST.
281 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
282 -7:00 US M%sT 1944 Jan 1 00:01
283 -7:00 - MST 1944 Mar 17 00:01
284 -7:00 US M%sT 1944 Oct 1 00:01
288 # From Arthur David Olson (1988-02-13):
289 # A writer from the Inter Tribal Council of Arizona, Inc.,
290 # notes in private correspondence dated 12/28/87 that "Presently, only the
291 # Navajo Nation participates in the Daylight Saving Time policy, due to its
292 # large size and location in three states." (The "only" means that other
293 # tribal nations don't use DST.)
295 Link America/Denver America/Shiprock
297 # Southern Idaho and eastern Oregon switched four weeks late in 1974.
298 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
299 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
300 -8:00 US P%sT 1923 May 13 2:00
302 -7:00 - MST 1974 Feb 3 2:00
307 # For a map of Indiana's time zone regions, see:
308 # <a href="http://www.mccsc.edu/time.html">
309 # What time is it in Indiana?
312 # From Paul Eggert (1995-12-19):
313 # Indiana generally observes either EST all year, or CST/CDT,
314 # but areas near Cincinnati and Louisville use those cities' timekeeping
315 # and in 1969 and 1970 the whole state observed daylight time;
316 # and there are other exceptions as noted below.
317 # Shanks partitions Indiana into 345 regions, each with its own time history,
318 # and writes ``Even newspaper reports present contradictory information.''
319 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
321 # Since 1970, EST-only Indiana has been like America/Indianapolis,
322 # with exceptions noted below for Crawford, Starke, and Switzerland counties.
323 # The parts of Indiana not listed below have been like America/Chicago,
324 # America/Louisville, or America/New_York.
326 # Other than Indianapolis, the Indiana place names are so nondescript
327 # that they would be ambiguous if we left them at the `America' level.
328 # So we reluctantly put them all in a subdirectory `America/Indiana'.
330 # Most of EST-only Indiana last observed DST in 1970.
331 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
332 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
333 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
334 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
335 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
336 Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
338 -6:00 Indianapolis C%sT 1942
340 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
341 -5:00 - EST 1957 Sep 29 2:00
342 -6:00 - CST 1958 Apr 27 2:00
346 Link America/Indianapolis America/Indiana/Indianapolis
348 # Part of Crawford County, Indiana, last observed DST in 1975,
349 # and left its clocks alone in 1974.
350 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
351 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
352 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
353 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
354 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
355 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
356 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
358 -6:00 Marengo C%sT 1961 Apr 30 2:00
360 -5:00 US E%sT 1974 Jan 6 2:00
361 -6:00 1:00 CDT 1974 Oct 27 2:00
365 # Starke County, Indiana
366 # From Arthur David Olson (1991-10-28):
367 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
368 # notes that Starke County switched from Central time to Eastern time as of
370 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
371 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
372 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
373 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
374 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
375 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
376 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
377 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
379 -6:00 Starke C%sT 1962 Apr 29 2:00
380 -5:00 - EST 1963 Oct 27 2:00
381 -6:00 US C%sT 1991 Oct 27 2:00
384 # Switzerland County, Indiana, last observed DST in 1972.
385 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
386 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
387 -6:00 US C%sT 1954 Apr 25 2:00
392 # Part of Kentucky left its clocks alone in 1974.
393 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
394 Rule Louisville 1921 only - May 1 2:00 1:00 D
395 Rule Louisville 1921 only - Sep 1 2:00 0 S
396 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
397 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
398 Rule Louisville 1946 only - Jun 2 2:00 0 S
399 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
400 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
401 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
402 Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
404 -6:00 Louisville C%sT 1942
406 -6:00 Louisville C%sT 1961 Jul 23 2:00
408 -5:00 US E%sT 1974 Jan 6 2:00
409 -6:00 1:00 CDT 1974 Oct 27 2:00
414 # From Bob Devine (1988-01-28):
415 # Michigan didn't observe DST from 1968 to 1973.
417 # From Paul Eggert (1999-03-31):
418 # Shanks writes that Michigan started using standard time on 1885-09-18,
419 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
422 # local time until 1900 when the City Council decreed that clocks should
423 # be put back twenty-eight minutes to Central Standard Time. Half the
424 # city obeyed, half refused. After considerable debate, the decision
425 # was rescinded and the city reverted to Sun time. A derisive offer to
426 # erect a sundial in front of the city hall was referred to the
427 # Committee on Sewers. Then, in 1905, Central time was adopted
430 # This story is too entertaining to be false, so go with Howse over Shanks.
432 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
433 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
434 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
435 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
436 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
437 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
438 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
439 Zone America/Detroit -5:32:11 - LMT 1905
440 -6:00 - CST 1915 May 15 2:00
443 -5:00 Detroit E%sT 1973
445 -5:00 - EST 1975 Apr 27 2:00
448 # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
449 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
450 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
451 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
452 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
453 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
454 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
455 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
457 -6:00 Menominee C%sT 1969 Apr 27 2:00
458 -5:00 - EST 1973 Apr 29 2:00
462 # claimed by US under the provisions of the 1856 Guano Islands Act
463 # also claimed by Haiti
464 # occupied 1857/1900 by the Navassa Phosphate Co
465 # US lighthouse 1917/1997-01
466 # currently uninhabited
467 # see Mark Fineman, ``An Isle Rich in Guano and Discord'',
468 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
469 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
471 # Old names, for S5 users
473 # Link LINK-FROM LINK-TO
474 Link America/New_York EST5EDT
475 Link America/Chicago CST6CDT
476 Link America/Denver MST7MDT
477 Link America/Los_Angeles PST8PDT
478 Link America/Indianapolis EST
479 Link America/Phoenix MST
480 Link Pacific/Honolulu HST
482 ################################################################################
485 # From Paul Eggert <eggert@twinsun.com> (1996-11-22):
486 # A good source for time zone historical data outside the US is
487 # Thomas G. Shanks, The International Atlas (4th edition),
488 # San Diego: ACS Publications, Inc. (1995).
490 # Gwillim Law <LAW@encmail.encompass.com> writes that a good source
491 # for recent time zone data is the International Air Transport
492 # Association's Standard Schedules Information Manual (IATA SSIM),
493 # published semiannually. Law sent in several helpful summaries
494 # of the IATA's data after 1990.
496 # Except where otherwise noted, Shanks is the source for entries through 1990,
497 # and IATA SSIM is the source for entries after 1990.
499 # Another source occasionally used is Edward W. Whitman, World Time Differences,
500 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
501 # I found in the UCLA library.
503 # See the `europe' file for Greenland.
507 # From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
508 # I post here the time zone abbreviations standardized in Canada
509 # for both English and French in the CAN/CSA-Z234.4-89 standard....
511 # UTC Standard time Daylight savings time
512 # offset French English French English
523 # HN: Heure Normale ST: Standard Time
524 # HA: Heure Avanc<e'>e DT: Daylight saving Time
526 # A: de l'Atlantique Atlantic
527 # C: du Centre Central
528 # E: de l'Est Eastern
531 # P: du Pacifique Pacific
536 # From Paul Eggert <eggert@twinsun.com> (1994-11-22):
537 # Alas, this sort of thing must be handled by localization software.
539 # The data for Canada are all from Shanks (1991).
542 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
543 Rule Canada 1918 only - Apr 14 2:00 1:00 D
544 Rule Canada 1918 only - Oct 31 2:00 0 S
545 Rule Canada 1942 only - Feb 9 2:00 1:00 D
546 Rule Canada 1945 only - Sep 30 2:00 0 S
547 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
548 Rule Canada 1974 max - Oct lastSun 2:00 0 S
549 Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
552 # Newfoundland (except Labrador)
554 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
555 Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
556 Rule StJohns 1917 only - Sep 17 2:00 0 S
557 Rule StJohns 1918 only - Oct 31 2:00 0 S
558 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
559 Rule StJohns 1919 only - May 5 23:00 1:00 D
560 Rule StJohns 1919 only - Aug 12 23:00 0 S
561 # For 1931-1935 Whitman gives Apr same date; go with Shanks.
562 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
563 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
564 # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
565 Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
566 Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
567 # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
568 Rule StJohns 1942 only - Mar 1 0:00 1:00 D
569 Rule StJohns 1942 only - Dec 31 0:00 0 S
570 Rule StJohns 1943 only - May 30 0:00 1:00 D
571 Rule StJohns 1943 only - Sep 5 0:00 0 S
572 Rule StJohns 1944 only - Jul 10 0:00 1:00 D
573 Rule StJohns 1944 only - Sep 2 0:00 0 S
574 Rule StJohns 1945 only - Jan 1 0:00 1:00 D
575 Rule StJohns 1945 only - Oct 7 2:00 0 S
576 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
577 # Apr 30 - Sep 24; go with Shanks.
578 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
579 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
580 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
581 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
582 Rule StJohns 1960 max - Oct lastSun 2:00 0 S
583 Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
584 Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD
585 Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
586 # St John's has an apostrophe, but Posix file names can't have apostrophes.
587 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
588 Zone America/St_Johns -3:30:52 - LMT 1884
589 -3:30:52 StJohns N%sT 1935 Mar 30
595 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
596 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
597 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
598 -3:30:52 StJohns NST 1919
599 -3:30:52 - NST 1935 Mar 30
601 -3:30 StJohns N%sT 1966 Mar 15 2:00
605 # west Labrador, New Brunswick, Nova Scotia, Prince Edward I
607 # From Paul Eggert (1996-06-12):
608 # Shanks writes that since 1970 most of this region has been like Halifax.
609 # Many locales did not observe peacetime DST until 1972;
610 # Glace Bay, NS is the largest that we know of.
611 # Shanks also writes that Liverpool, NS was the only town in Canada to observe
612 # DST in 1971 but not 1970; for now we'll assume this is a typo.
614 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
615 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
616 Rule Halifax 1916 only - Oct 1 0:00 0 S
617 Rule Halifax 1918 only - Apr 14 2:00 1:00 D
618 Rule Halifax 1918 only - Oct 31 2:00 0 S
619 Rule Halifax 1920 only - May 9 0:00 1:00 D
620 Rule Halifax 1920 only - Aug 29 0:00 0 S
621 Rule Halifax 1921 only - May 6 0:00 1:00 D
622 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
623 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
624 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
625 Rule Halifax 1923 only - Sep 4 0:00 0 S
626 Rule Halifax 1924 only - Sep 15 0:00 0 S
627 Rule Halifax 1925 only - Sep 28 0:00 0 S
628 Rule Halifax 1926 only - May 16 0:00 1:00 D
629 Rule Halifax 1926 only - Sep 13 0:00 0 S
630 Rule Halifax 1927 only - May 1 0:00 1:00 D
631 Rule Halifax 1927 only - Sep 26 0:00 0 S
632 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
633 Rule Halifax 1928 only - Sep 9 0:00 0 S
634 Rule Halifax 1929 only - Sep 3 0:00 0 S
635 Rule Halifax 1930 only - Sep 15 0:00 0 S
636 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
637 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
638 Rule Halifax 1933 only - Oct 2 0:00 0 S
639 Rule Halifax 1934 only - May 20 0:00 1:00 D
640 Rule Halifax 1934 only - Sep 16 0:00 0 S
641 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
642 Rule Halifax 1935 only - Sep 30 0:00 0 S
643 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
644 Rule Halifax 1936 only - Sep 14 0:00 0 S
645 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
646 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
647 Rule Halifax 1939 only - May 28 0:00 1:00 D
648 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
649 Rule Halifax 1942 only - Feb 9 2:00 1:00 D
650 Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
651 Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
652 Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
653 Rule Halifax 1962 max - Oct lastSun 2:00 0 S
654 Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
655 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
656 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
658 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
659 -4:00 Canada A%sT 1953
660 -4:00 Halifax A%sT 1954
667 # From Paul Eggert (1996-06-12):
668 # Shanks writes that since 1970 most of this region has been like Montreal.
669 # Thunder Bay skipped DST in 1973.
670 # Many smaller locales did not observe peacetime DST until 1974;
671 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
672 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
674 # From Paul Eggert (1997-10-17):
675 # msb@sq.com writes that an article in the 1997-10-14 Toronto Star
676 # says that Atikokan, Ontario currently does not observe DST,
677 # but will vote on 11-10 whether to use EST/EDT.
678 # He also writes that the
679 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
680 # Ontario Time Act (1990, Chapter T.9)
682 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
683 # Officially Atikokan is therefore on CST/CDT, and most likely this report
684 # concerns a non-official time observed as a matter of local practice.
685 # For what it's worth, Shanks (1995) says that Atikokan has agreed with
686 # Rainy River ever since standard time was introduced.
688 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
689 Rule Mont 1917 only - Mar 25 2:00 1:00 D
690 Rule Mont 1917 only - Apr 24 0:00 0 S
691 Rule Mont 1918 only - Apr 14 2:00 1:00 D
692 Rule Mont 1918 only - Oct 31 2:00 0 S
693 Rule Mont 1919 only - Mar 31 2:30 1:00 D
694 Rule Mont 1919 only - Oct 25 2:30 0 S
695 Rule Mont 1920 only - May 2 2:30 1:00 D
696 Rule Mont 1920 only - Oct 3 2:30 0 S
697 Rule Mont 1921 only - May 1 2:00 1:00 D
698 Rule Mont 1921 only - Oct 2 2:30 0 S
699 Rule Mont 1922 only - Apr 30 2:00 1:00 D
700 Rule Mont 1922 only - Oct 1 2:30 0 S
701 Rule Mont 1924 only - May 17 2:00 1:00 D
702 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
703 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
704 Rule Mont 1927 only - May 1 0:00 1:00 D
705 Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
706 Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
707 Rule Mont 1932 only - May 1 0:00 1:00 D
708 Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
709 Rule Mont 1933 only - Oct 1 0:00 0 S
710 Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
711 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
712 Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
713 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
714 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
715 Rule Mont 1957 max - Oct lastSun 2:00 0 S
716 Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
717 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
718 Zone America/Montreal -4:54:16 - LMT 1884
720 Zone America/Thunder_Bay -5:57:00 - LMT 1895
721 -5:00 Canada E%sT 1970
725 Zone America/Nipigon -5:53:04 - LMT 1895
727 Zone America/Rainy_River -6:17:56 - LMT 1895
733 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
734 Rule Winn 1916 only - Apr 23 0:00 1:00 D
735 Rule Winn 1916 only - Sep 17 0:00 0 S
736 Rule Winn 1918 only - Apr 14 2:00 1:00 D
737 Rule Winn 1918 only - Oct 31 2:00 0 S
738 Rule Winn 1937 only - May 16 2:00 1:00 D
739 Rule Winn 1937 only - Sep 26 2:00 0 S
740 Rule Winn 1942 only - Feb 9 2:00 1:00 D
741 Rule Winn 1945 only - Sep lastSun 2:00 0 S
742 Rule Winn 1946 only - May 12 2:00 1:00 D
743 Rule Winn 1946 only - Oct 13 2:00 0 S
744 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
745 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
746 Rule Winn 1950 only - May 1 2:00 1:00 D
747 Rule Winn 1950 only - Sep 30 2:00 0 S
748 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
749 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
750 Rule Winn 1959 only - Oct lastSun 2:00 0 S
751 Rule Winn 1960 only - Sep lastSun 2:00 0 S
752 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
753 Rule Winn 1963 only - Sep 22 2:00 0 S
754 Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
755 Rule Winn 1966 max - Oct lastSun 2:00 0 S
756 Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
757 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
758 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
764 # From Paul Eggert (1996-06-12):
765 # Shanks writes that since 1970 most of this region has been like Regina.
766 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
767 # Other western towns (e.g. Lloydminster) are like Edmonton.
769 # From W. Jones <jones@skdad.usask.ca> (1992-11-06):
770 # The. . .below is based on information I got from our law library, the
771 # provincial archives, and the provincial Community Services department.
772 # A precise history would require digging through newspaper archives, and
773 # since you didn't say what you wanted, I didn't bother.
775 # Saskatchewan is split by a time zone meridian (105W) and over the years
776 # the boundary became pretty ragged as communities near it reevaluated
777 # their affiliations in one direction or the other. In 1965 a provincial
778 # referendum favoured legislating common time practices.
780 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
781 # Saskatchewan 1978) was proclaimed, and established that the eastern
782 # part of Saskatchewan would use CST year round, that districts in
783 # northwest Saskatchewan would by default follow CST but could opt to
784 # follow Mountain Time rules (thus 1 hour difference in the winter and
785 # zero in the summer), and that districts in southwest Saskatchewan would
786 # by default follow MT but could opt to follow CST.
788 # It took a few years for the dust to settle (I know one story of a town
789 # on one time zone having its school in another, such that a mom had to
790 # serve her family lunch in two shifts), but presently it seems that only
791 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
792 # rules any more; all other districts appear to have used CST year round
793 # since sometime in the 1960s.
795 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
796 Rule Regina 1918 only - Apr 14 2:00 1:00 D
797 Rule Regina 1918 only - Oct 31 2:00 0 S
798 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
799 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
800 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
801 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
802 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
803 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
804 Rule Regina 1942 only - Feb 9 2:00 1:00 D
805 Rule Regina 1945 only - Sep lastSun 2:00 0 S
806 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
807 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
808 Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
809 Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
810 Rule Regina 1959 only - Oct lastSun 2:00 0 S
812 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
813 Rule Swift 1957 only - Oct lastSun 2:00 0 S
814 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
815 Rule Swift 1959 only - Oct lastSun 2:00 0 S
816 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
817 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
818 Zone America/Regina -6:58:36 - LMT 1905 Sep
819 -7:00 Regina M%sT 1960 Apr lastSun 2:00
821 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
822 -7:00 Canada M%sT 1946 Apr lastSun 2:00
823 -7:00 Regina M%sT 1950
824 -7:00 Swift M%sT 1972 Apr lastSun 2:00
830 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
831 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
832 Rule Edm 1918 only - Oct 31 2:00 0 S
833 Rule Edm 1919 only - May 27 2:00 0 S
834 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
835 Rule Edm 1920 only - Oct lastSun 2:00 0 S
836 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
837 Rule Edm 1942 only - Feb 9 2:00 1:00 D
838 Rule Edm 1945 only - Sep lastSun 2:00 0 S
839 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
840 Rule Edm 1947 only - Sep lastSun 2:00 0 S
841 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
842 Rule Edm 1967 only - Oct lastSun 2:00 0 S
843 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
844 Rule Edm 1969 only - Oct lastSun 2:00 0 S
845 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
846 Rule Edm 1972 max - Oct lastSun 2:00 0 S
847 Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
848 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
849 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
855 # From Paul Eggert (1996-06-12):
856 # Shanks writes that since 1970 most of this region has been like Vancouver.
857 # Dawswon Creek uses MST. Much of east BC is like Edmonton.
859 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
860 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
861 Rule Vanc 1918 only - Oct 31 2:00 0 S
862 Rule Vanc 1942 only - Feb 9 2:00 1:00 D
863 Rule Vanc 1945 only - Sep 30 2:00 0 S
864 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
865 Rule Vanc 1946 only - Oct 13 2:00 0 S
866 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
867 Rule Vanc 1962 max - Oct lastSun 2:00 0 S
868 Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
869 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
870 Zone America/Vancouver -8:12:28 - LMT 1884
872 Zone America/Dawson_Creek -8:00:56 - LMT 1884
873 -8:00 Canada P%sT 1947
874 -8:00 Vanc P%sT 1972 Aug 30 2:00
878 # Northwest Territories, Nunavut, Yukon
880 # From Paul Eggert (1996-10-07):
881 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
882 # Shanks's table for Watson Lake is corrupted, so we have no data there.
883 # Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
884 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
885 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
886 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
887 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
888 # * O.I.C. 1980/02 established DST.
889 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
890 # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
892 # From Rives McDow (1999-09-04):
893 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
894 # <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
895 # The change announcement
898 # From Antoine Leca (1999-09-06):
899 # We then need to create a new timezone for the Kitikmeot region of Nunavut
900 # to differentiate it from the Yellowknife region.
902 # From Paul Eggert (1999-09-20):
903 # <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
904 # Basic Facts: The New Territory
905 # </a> (1999) reports that Pangnirtung operates on Eastern time,
906 # and that Coral Harbour does not observe DST. We don't know when
907 # Pangnirtung switched to Eastern time; we'll guess 1995.
908 # We'll ignore the claim about Coral Harbour for now,
909 # since we have no further info.
911 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
912 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
913 Rule NT_YK 1918 only - Oct 27 2:00 0 S
914 Rule NT_YK 1919 only - May 25 2:00 1:00 D
915 Rule NT_YK 1919 only - Nov 1 0:00 0 S
916 Rule NT_YK 1942 only - Feb 9 2:00 1:00 D
917 Rule NT_YK 1945 only - Sep 30 2:00 0 S
918 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
919 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
920 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
921 Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
922 Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
923 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
924 Zone America/Pangnirtung -4:22:56 - LMT 1884
925 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
926 -5:00 Canada E%sT 1999 Oct 31 2:00
928 Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987
929 -5:00 NT_YK E%sT 1999 Oct 31 2:00
931 Zone America/Rankin_Inlet -6:08:40 - LMT 1884
933 Zone America/Cambridge_Bay -7:00:20 - LMT 1884
934 -7:00 NT_YK M%sT 1999 Oct 31 2:00
936 Zone America/Yellowknife -7:37:24 - LMT 1884
938 Zone America/Inuvik -8:54:00 - LMT 1884
939 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
941 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
942 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
944 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
945 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
949 ###############################################################################
954 # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
955 # Rules [before] 1987 are unknown.
956 # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
957 # observe DST." This is presumably Baja California Norte, above 28th parallel,
958 # as listed there; [there is also] "Baja California Sur and N. Pacific
959 # Coast (States of Sinaloa and Sonora)."
961 # From Bob Devine (1988-01-28):
962 # The Federal District (where Mexico City is) has observed [DST] several
963 # times but not recently.
965 # I don't where to drawn the line in the North Baja area. 28th latitude
966 # sounds good -- but it may be higher (how far [d]o radio stations from
967 # San Diego affect culture?).
969 # The dates of DST probably go back to 1981. The rules are the same as
970 # US's. This is going to be a headache for US presidential electi[o]n years!
972 # From Arthur David Olson (1988-02-13)
973 # Since the 1981 starting date is only "probable," we'll keep the 1987
974 # starting date below.
976 # From U. S. Naval Observatory (1989-01-19):
977 # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
978 # MEXICO BAJA CAL N N. PACIFIC COAST (STATES
979 # MEXICO BAJA CAL N OF SINALOA AND SONORA)
980 # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
981 # MEXICO BAJA CAL N - OCT 29
982 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
983 # MEXICO BAJA CAL N - 0CT 29
984 # MEXICO 6 H BEHIND UTC STATES OF DURANGO,
985 # MEXICO COAHUILA, NUEVO LEON,
987 # MEXICO 5 H BEHIND UTC STATES OF DURANGO,
988 # MEXICO COAHUILA, NUEVO LEON,
989 # MEXICO TAMAULIPAS APR 3 - OCT 29
990 # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
991 # MEXICO CAMPECHE, QUINTANA ROO AND
994 # From Arthur David Olson (1989-01-21):
995 # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
996 # USNO claims there should be four Mexican zones rather than three:
997 # a zone that's GMT-8 with DST; a zone that's always GMT-7;
998 # a zone that's GMT-6 with DST; and a zone that's always GMT-6.
1000 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
1001 # Shanks also says there are four zones, but disagrees about the fourth.
1002 # Instead of GMT-6 with DST, he says there's GMT-8 without DST.
1004 # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1005 # A guy from our Mexico subsidiary finally found the Presidential Decree
1006 # outlining the timezone changes in Mexico.
1008 # ------------- Begin Forwarded Message -------------
1010 # I finally got my hands on the Official Presidential Decree that sets up the
1011 # rules for the DST changes. The rules are:
1013 # 1. The country is divided in 3 timezones:
1014 # - Baja California Norte (the Mexico/BajaNorte TZ)
1015 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1016 # - The rest of the country (the Mexico/General TZ)
1018 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1019 # at 2:00 AM, the times in each zone are as follows:
1024 # 3. The rest of the year, the times are as follows:
1029 # The Decree was published in Mexico's Official Newspaper on January 4th.
1031 # -------------- End Forwarded Message --------------
1032 # From Paul Eggert (1996-06-12):
1033 # For an English translation of the decree, see
1034 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
1035 # ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1038 # From Rives McDow (1998-10-08):
1039 # The State of Quintana Roo has reverted back to central STD and DST times
1040 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
1042 # From Shanks (1991):
1043 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1044 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1045 Rule Mexico 1939 only - Jun 25 0:00 0 S
1046 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1047 Rule Mexico 1941 only - Apr 1 0:00 0 S
1048 Rule Mexico 1943 only - Dec 16 0:00 1:00 D
1049 Rule Mexico 1944 only - May 1 0:00 0 S
1050 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1051 Rule Mexico 1950 only - Jul 30 0:00 0 S
1052 Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
1053 Rule Mexico 1996 max - Oct lastSun 2:00 0 S
1055 Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
1056 Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
1057 Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
1058 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1060 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 1:12:42
1062 -6:00 Mexico C%sT 1997 Oct lastSun 2:00
1063 -5:00 Mexico E%sT 1998 Aug 2 2:00
1066 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1067 -7:00 - MST 1927 Jun 10 23:00
1068 -6:00 - CST 1930 Nov 15
1069 -7:00 - MST 1931 May 1 23:00
1070 -6:00 - CST 1931 Oct
1071 -7:00 - MST 1932 Mar 30 23:00
1074 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:44
1075 -7:00 - MST 1927 Jun 10 23:00
1076 -6:00 - CST 1930 Nov 15
1077 -7:00 - MST 1931 May 1 23:00
1078 -6:00 - CST 1931 Oct
1079 -7:00 - MST 1932 Mar 30 23:00
1081 -6:00 Mexico C%sT 1998
1082 -6:00 - CST 1998 Apr Sun>=1 3:00
1084 # S Baja California, Nayarit, Sinaloa, Sonora
1085 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1086 -7:00 - MST 1927 Jun 10 23:00
1087 -6:00 - CST 1930 Nov 15
1088 -7:00 - MST 1931 May 1 23:00
1089 -6:00 - CST 1931 Oct
1090 -7:00 - MST 1932 Mar 30 23:00
1091 -6:00 - CST 1942 Apr
1092 -7:00 - MST 1949 Jan 14
1096 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1097 -8:00 - PST 1927 Jun 10 23:00
1098 -7:00 - MST 1930 Nov 16
1099 -8:00 - PST 1942 Apr
1100 -7:00 - MST 1949 Jan 14
1101 -8:00 BajaN P%sT 1967 Apr lastSun 2:00
1105 Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
1106 -8:00 - PST 1927 Jun 10 23:00
1107 -7:00 - MST 1930 Nov 16
1108 -8:00 - PST 1942 Apr
1109 -7:00 - MST 1949 Jan 14
1116 ###############################################################################
1119 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1120 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1123 # Antigua and Barbuda
1124 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1125 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1130 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1131 Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1132 Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1133 Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1134 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1135 Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1139 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1140 Rule Barb 1977 only - Jun 12 2:00 1:00 D
1141 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1142 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1143 Rule Barb 1979 only - Sep 30 2:00 0 S
1144 Rule Barb 1980 only - Sep 25 2:00 0 S
1145 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1146 Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1147 -3:58:28 - BMT 1932 # Bridgetown Mean Time
1151 # Whitman entirely disagrees with Shanks; go with Shanks.
1152 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1153 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1154 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1155 Rule Belize 1973 only - Dec 5 0:00 1:00 D
1156 Rule Belize 1974 only - Feb 9 0:00 0 S
1157 Rule Belize 1982 only - Dec 18 0:00 1:00 D
1158 Rule Belize 1983 only - Feb 12 0:00 0 S
1159 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1160 Zone America/Belize -5:52:48 - LMT 1912 Apr
1164 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1165 Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1166 -4:00 - AST 1974 Apr 28 2:00
1170 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1171 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1172 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1176 # Shanks gives some very odd dates for 1991, and stops there.
1177 # For now, we won't guess further.
1178 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1179 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1180 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1181 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1182 # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1183 Rule CR 1991 only - Jul 1 0:00 0 S
1184 Rule CR 1992 only - Mar 15 0:00 0 S
1185 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1186 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1187 Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1188 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
1191 # no information; probably like America/Costa_Rica
1195 # From Arthur David Olson (1999-03-29):
1196 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
1197 # the Cuban National Team and the Baltimore Orioles was carried live on
1198 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
1199 # During the game, play-by-play announcer Jim Hunter noted that
1200 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
1201 # Time today." (The "two hour" remark referred to losing one hour of
1202 # sleep on 1999-03-28--when the announcers were in Cuba as it switched
1203 # to DST--and one more hour on 1999-04-04--when the announcers will have
1204 # returned to Baltimore, which switches on that date.)
1206 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1207 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1208 Rule Cuba 1928 only - Oct 10 0:00 0 S
1209 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1210 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1211 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1212 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1213 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1214 Rule Cuba 1965 only - Sep 30 0:00 0 S
1215 Rule Cuba 1966 only - May 29 0:00 1:00 D
1216 Rule Cuba 1966 only - Oct 2 0:00 0 S
1217 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1218 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1219 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1220 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1221 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1222 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1223 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1224 Rule Cuba 1978 only - May 7 0:00 1:00 D
1225 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1226 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1227 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1228 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1229 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
1230 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1231 Rule Cuba 1996 only - Oct 6 0:00s 0 S
1232 Rule Cuba 1997 only - Oct 12 0:00s 0 S
1233 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
1234 Rule Cuba 1998 max - Oct lastSun 0:00s 0 S
1235 Rule Cuba 2000 max - Apr 1 0:00s 1:00 D
1237 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1238 Zone America/Havana -5:29:28 - LMT 1890
1239 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT
1243 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1244 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1247 # Dominican Republic
1248 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1249 Rule DR 1966 only - Oct 30 0:00 1:00 D
1250 Rule DR 1967 only - Feb 28 0:00 0 S
1251 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1252 Rule DR 1970 only - Feb 21 0:00 0 S
1253 Rule DR 1971 only - Jan 20 0:00 0 S
1254 Rule DR 1972 1974 - Jan 21 0:00 0 S
1255 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1256 Zone America/Santo_Domingo -4:39:36 - LMT 1890
1257 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1258 -5:00 DR E%sT 1974 Oct 27
1262 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1263 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1264 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1265 # There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1266 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1267 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1271 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1272 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1276 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1277 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1281 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1282 Rule Guat 1973 only - Nov 25 0:00 1:00 D
1283 Rule Guat 1974 only - Feb 24 0:00 0 S
1284 Rule Guat 1983 only - May 21 0:00 1:00 D
1285 Rule Guat 1983 only - Sep 22 0:00 0 S
1286 Rule Guat 1991 only - Mar 23 0:00 1:00 D
1287 Rule Guat 1991 only - Sep 7 0:00 0 S
1288 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1289 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1293 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1294 Rule Haiti 1983 only - May 8 0:00 1:00 D
1295 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1296 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1297 # Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA.
1298 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
1299 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
1300 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1301 Zone America/Port-au-Prince -4:49:20 - LMT 1890
1302 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1306 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1307 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1308 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1311 # Great Swan I ceded by US to Honduras in 1972
1315 # From Bob Devine (1988-01-28):
1318 # From U. S. Naval Observatory (1989-01-19):
1319 # JAMAICA 5 H BEHIND UTC
1321 # From Shanks (1991):
1322 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1323 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1324 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1325 -5:00 - EST 1974 Jan 6 2:00
1330 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1331 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1332 -4:04 - FFMT 1911 May # Fort-de-France MT
1333 -4:00 - AST 1980 Apr 6
1334 -4:00 1:00 ADT 1980 Sep 28
1338 # From Paul Eggert (1997-08-31):
1339 # Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
1340 # Luckily, Olveston, the current de facto capital, has the same longitude.
1341 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1342 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
1347 # From Steffen Thorsen (1998-12-29):
1348 # Nicaragua seems to be back at -6:00 but I have not been able to find when
1349 # they changed from -5:00.
1351 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1352 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1353 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1354 Rule Nic 1992 only - Jan 1 4:00 1:00 D
1355 Rule Nic 1992 only - Sep 24 0:00 0 S
1356 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1357 Zone America/Managua -5:45:08 - LMT 1890
1358 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
1359 -6:00 - CST 1973 May
1360 -5:00 - EST 1975 Feb 16
1361 -6:00 Nic C%sT 1993 Jan 1 4:00
1362 -5:00 - EST 1998 Dec
1366 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1367 Zone America/Panama -5:18:08 - LMT 1890
1368 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
1372 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1373 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1374 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1375 -4:00 - AST 1942 May 3
1376 -4:00 1:00 AWT 1945 Sep 30 2:00
1380 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1381 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1385 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1386 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1387 -4:04 - CMT 1912 # Castries Mean Time
1390 # St Pierre and Miquelon
1391 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1392 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1393 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1394 -4:00 - AST 1980 May
1395 -3:00 Mont PM%sT # Pierre & Miquelon Time
1397 # St Vincent and the Grenadines
1398 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1399 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1400 -4:04:56 - KMT 1912 # Kingstown Mean Time
1404 # From Paul Eggert (1998-08-06):
1405 # Shanks says they use US DST rules, but IATA SSIM (1991/1998)
1406 # says they switch at midnight. Go with IATA SSIM.
1407 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1408 Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1409 Rule TC 1979 max - Oct lastSun 0:00 0 S
1410 Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1411 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1412 Zone America/Grand_Turk -4:44:32 - LMT 1890
1413 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1417 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1418 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1422 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1423 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
projects / platform / upstream / glibc.git / blob