1 # @(#)northamerica 7.58
2 # also includes Central America and the Caribbean
4 # $FreeBSD: src/share/zoneinfo/northamerica,v 1.18 2001/04/06 16:46:52 wollman Exp $
6 # This data is by no means authoritative; if you think you know better,
7 # go ahead and edit the file (and please send any changes to
8 # tz@elsie.nci.nih.gov for general use in the future).
10 # From Paul Eggert <eggert@twinsun.com> (1999-03-22):
11 # A reliable and entertaining source about time zones is
12 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
14 ###############################################################################
18 # From Paul Eggert (1999-03-31):
19 # Howse writes (pp 121-125) that time zones were invented by
20 # Professor Charles Ferdinand Dowd (1825-1904),
21 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
22 # His pamphlet ``A System of National Time for Railroads'' (1870)
23 # was the result of his proposals at the Convention of Railroad Trunk Lines
24 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
25 # but in 1872-05 he moved the proposed origin to Greenwich.
26 # His proposal was adopted by the railroads on 1883-11-18 at 12:00,
27 # and the most of the country soon followed suit.
29 # From Paul Eggert <eggert@twinsun.com> (1995-12-19):
30 # A good source for time zone historical data in the US is
31 # Thomas G. Shanks, The American Atlas (5th edition),
32 # San Diego: ACS Publications, Inc. (1991).
33 # Make sure you have the errata sheet; the book is somewhat useless without it.
34 # It is the source for the US and Puerto Rico entries below.
36 # From Paul Eggert (2001-03-06):
37 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
38 # in his whimsical essay ``An Economical Project for Diminishing the Cost
39 # of Light'' published in the Journal de Paris (1784-04-26).
40 # Not everyone is happy with the results:
42 # I don't really care how time is reckoned so long as there is some
43 # agreement about it, but I object to being told that I am saving
44 # daylight when my reason tells me that I am doing nothing of the kind.
45 # I even object to the implication that I am wasting something
46 # valuable if I stay in bed after the sun has risen. As an admirer
47 # of moonlight I resent the bossy insistence of those who want to
48 # reduce my time for enjoying it. At the back of the Daylight Saving
49 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
50 # to push people into bed earlier, and get them up earlier, to make
51 # them healthy, wealthy and wise in spite of themselves.
53 # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
55 # For more about the first ten years of DST in the United States, see
56 # Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
57 # Ten years of daylight saving from the Pittsburgh standpoint
58 # (Carnegie Library of Pittsburgh, 1927)</a>.
60 # Shanks says that DST was called "War Time" in the US in 1918 and 1919.
61 # However, DST was imposed by the Standard Time Act of 1918, which
62 # was the first nationwide legal time standard, and apparently
63 # time was just called "Standard Time" or "Daylight Saving Time".
65 # From Arthur David Olson:
66 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
67 # See, for example, the front page of the Saturday, 1974-10-26
68 # and Sunday, 1974-10-27 editions of the Washington Post.
70 # From Arthur David Olson:
71 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
72 # Daylight Saving Time in the US was by local option, except during wartime.
74 # From Arthur David Olson (2000-09-25):
75 # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
76 # In the introduction, Oboler spoke of "Eastern Peace Time."
77 # An AltaVista search turned up
78 # <a href="http://rowayton.org/rhs/hstaug45.html">:
79 # "When the time is announced over the radio now, it is 'Eastern Peace
80 # Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
81 # </a> (August 1945) by way of confirmation.
83 # From Joseph Gallant <notquite@hotmail.com>, citing
84 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
85 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
86 # to switch to London for Atlee's address, but the American people
87 # never got to hear his speech live. According to one press account,
88 # CBS' Bob Trout was first to announce the word of Japan's surrender,
89 # but a few seconds later, NBC, ABC and Mutual also flashed the word
90 # of surrender, all of whom interrupting the bells of Big Ben in
91 # London which were to precede Mr. Atlee's speech.
93 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
94 Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
95 Rule US 1918 1919 - Oct lastSun 2:00 0 S
96 Rule US 1942 only - Feb 9 2:00 1:00 W # War
97 Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
98 Rule US 1945 only - Sep 30 2:00 0 S
99 Rule US 1967 max - Oct lastSun 2:00 0 S
100 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
101 Rule US 1974 only - Jan 6 2:00 1:00 D
102 Rule US 1975 only - Feb 23 2:00 1:00 D
103 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
104 Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
105 # <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:">
107 # </a> (introduced 1999-01-06) would change April to March in the above rule.
109 # From Bob Devine (1988-01-28):
110 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
112 # Pacific Standard Time(PST) -same-
113 # Yukon Standard Time(YST) -same-
114 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
115 # Nome Standard Time (NT) Bering Standard Time (BST)
117 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
118 # The YST zone now covers nearly all of the state, AHST just part
119 # of the Aleutian islands. No DST.
121 # From Paul Eggert (1995-12-19):
122 # The tables below use `NST', not `NT', for Nome Standard Time.
123 # I invented `CAWT' for Central Alaska War Time.
125 # From U. S. Naval Observatory (1989-01-19):
126 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
127 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
128 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
129 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
130 # USA MOUNTAIN 7 H BEHIND UTC DENVER
131 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
132 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
133 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
134 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
135 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
136 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
137 # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
138 # USA HAWAII 10 H BEHIND UTC
139 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
141 # From Arthur David Olson (1989-01-21):
142 # The above dates are for 1988.
143 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
144 # no DST in Samoa, and the claim that there is DST in Alaska and the
147 # From Arthur David Olson (1988-02-13):
148 # Legal standard time zone names, from United States Code (1982 Edition and
149 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
150 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
151 # took effect), as explained in sections 263 and 261:
153 # United States standard eastern time
154 # United States standard mountain time
155 # United States standard central time
156 # United States standard Pacific time
158 # United States standard Alaska time
160 # Next, names from 1967-04-01 until 1983-11-30 (the date for
161 # public law 98-181):
162 # Atlantic standard time
163 # eastern standard time
164 # central standard time
165 # mountain standard time
166 # Pacific standard time
167 # Yukon standard time
168 # Alaska-Hawaii standard time
169 # Bering standard time
170 # And after 1983-11-30:
171 # Atlantic standard time
172 # eastern standard time
173 # central standard time
174 # mountain standard time
175 # Pacific standard time
176 # Alaska standard time
177 # Hawaii-Aleutian standard time
178 # Samoa standard time
179 # The law doesn't give abbreviations.
181 # From Paul Eggert (1995-12-19):
182 # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
185 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
186 # Public law 106-564 (2000-12-23) introduced the abbreviation
187 # "Chamorro Standard Time" for time in Guam and the Northern Marianas.
188 # See the file "australasia".
190 # From Ryan Alessi of the Thousand Oaks Star (2001-02-15) via Rives McDow:
191 # Brad Sherman, D-Sherman Oaks, introduced a bill in Congress on
192 # Wednesday that could have California operating on Denver time as
193 # early as this summer.... The options include keeping
194 # daylight-saving time all year long, or setting clocks back two hours
195 # -- instead of just one -- during the existing daylight-saving time.
198 # US Eastern time, represented by New York
200 # Connecticut, Delaware, District of Columbia, most of Florida,
201 # Georgia, far southeastern Indiana, eastern Kentucky, Maine,
202 # Maryland, Massachusetts, New Hampshire, New Jersey, New York, North
203 # Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, eastern
204 # Tennessee, Vermont, Virginia, West Virginia
206 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
207 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
208 Rule NYC 1920 only - Oct lastSun 2:00 0 S
209 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
210 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
211 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
212 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
213 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
220 # US Central time, represented by Chicago
222 # Alabama, Arkansas, Florida panhandle, Illinois, western Indiana
223 # corners, Iowa, most of Kansas, western Kentucky, Louisiana,
224 # Minnesota, Mississippi, Missouri, eastern Nebraska, eastern North
225 # Dakota, Oklahoma, eastern South Dakota, western Tennessee, most of
228 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
229 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
230 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
231 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
232 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
233 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
234 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
235 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
236 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
238 -6:00 Chicago C%sT 1936 Mar 1 2:00
239 -5:00 - EST 1936 Nov 15 2:00
240 -6:00 Chicago C%sT 1942
242 -6:00 Chicago C%sT 1967
245 # US Mountain time, represented by Denver
247 # Colorado, southern Idaho, far western Kansas, Montana, western
248 # Nebraska, New Mexico, southwestern North Dakota, far eastern Oregon,
249 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
250 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
252 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
253 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
254 Rule Denver 1920 only - Oct lastSun 2:00 0 S
255 Rule Denver 1921 only - May 22 2:00 0 S
256 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
257 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
258 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
259 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
261 -7:00 Denver M%sT 1942
263 -7:00 Denver M%sT 1967
266 # US Pacific time, represented by Los Angeles
268 # California, northern Idaho, Nevada, most of Oregon, and Washington
270 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
271 Rule CA 1948 only - Mar 14 2:00 1:00 D
272 Rule CA 1949 only - Jan 1 2:00 0 S
273 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
274 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
275 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
276 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
277 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
283 # AK%sT is the modern abbreviation for -9:00 per USNO.
285 # From Paul Eggert (2001-04-01):
286 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
287 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
288 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
289 # also a Friday. Include only the time zone part of this transition,
290 # ignoring the switch from Julian to Gregorian, since we can't represent
291 # the Julian calendar.
293 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
294 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
295 -8:57:41 - LMT 1900 Aug 20 12:00
299 -8:00 US P%sT 1983 Oct 30 2:00
301 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
302 -9:18:55 - LMT 1900 Aug 20 12:00
306 -9:00 US Y%sT 1983 Oct 30 2:00
308 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
309 -9:59:36 - LMT 1900 Aug 20 12:00
311 -10:00 US CAT/CAWT 1946
312 -10:00 - CAT 1967 Apr
314 -10:00 US AH%sT 1983 Oct 30 2:00
316 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
317 -11:01:38 - LMT 1900 Aug 20 12:00
320 -11:00 - NST 1967 Apr
322 -11:00 US B%sT 1983 Oct 30 2:00
324 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
325 -11:46:38 - LMT 1900 Aug 20 12:00
328 -11:00 - NST 1967 Apr
330 -11:00 US B%sT 1983 Oct 30 2:00
332 # Shanks writes that part of southwest Alaska (e.g. Aniak)
333 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
334 # and another part (e.g. Akiak) made the same switch five weeks later.
335 # These switches don't quite make our 1970 cutoff.
339 # From Arthur David Olson:
340 # And then there's Hawaii.
341 # DST was observed for one day in 1933;
342 # standard time was changed by half an hour in 1947;
343 # it's always standard as of 1986.
346 # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
348 Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
349 -10:30 - HST 1933 Apr 30 2:00
350 -10:30 1:00 HDT 1933 May 21 2:00
351 -10:30 US H%sT 1947 Jun 8 2:00
354 # Now we turn to US areas that have diverged from the consensus since 1970.
356 # Arizona mostly uses MST.
357 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
358 -7:00 US M%sT 1944 Jan 1 00:01
359 -7:00 - MST 1944 Mar 17 00:01
360 -7:00 US M%sT 1944 Oct 1 00:01
364 # From Arthur David Olson (1988-02-13):
365 # A writer from the Inter Tribal Council of Arizona, Inc.,
366 # notes in private correspondence dated 12/28/87 that "Presently, only the
367 # Navajo Nation participates in the Daylight Saving Time policy, due to its
368 # large size and location in three states." (The "only" means that other
369 # tribal nations don't use DST.)
371 Link America/Denver America/Shiprock
373 # Southern Idaho and eastern Oregon switched four weeks late in 1974.
374 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
375 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
376 -8:00 US P%sT 1923 May 13 2:00
378 -7:00 - MST 1974 Feb 3 2:00
383 # For a map of Indiana's time zone regions, see:
384 # <a href="http://www.mccsc.edu/time.html">
385 # What time is it in Indiana?
388 # From Paul Eggert (1995-12-19):
389 # Indiana generally observes either EST all year, or CST/CDT,
390 # but areas near Cincinnati and Louisville use those cities' timekeeping
391 # and in 1969 and 1970 the whole state observed daylight time;
392 # and there are other exceptions as noted below.
393 # Shanks partitions Indiana into 345 regions, each with its own time history,
394 # and writes ``Even newspaper reports present contradictory information.''
395 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
397 # Since 1970, EST-only Indiana has been like America/Indianapolis,
398 # with exceptions noted below for Crawford, Starke, and Switzerland counties.
399 # The parts of Indiana not listed below have been like America/Chicago,
400 # America/Louisville, or America/New_York.
402 # Other than Indianapolis, the Indiana place names are so nondescript
403 # that they would be ambiguous if we left them at the `America' level.
404 # So we reluctantly put them all in a subdirectory `America/Indiana'.
406 # Most of EST-only Indiana last observed DST in 1970.
408 # From Paul Eggert (2001-03-06), following a tip by Markus Kuhn:
409 # Pam Belluck reported in the New York Times (2001-01-31) that the
410 # Indiana Legislature is considering a bill to adopt DST statewide.
411 # Her article mentioned Vevay, whose post office observes a different
412 # time zone than Danner's Hardware across the street.
414 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
415 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
416 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
417 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
418 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
419 Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
421 -6:00 Indianapolis C%sT 1942
423 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
424 -5:00 - EST 1957 Sep 29 2:00
425 -6:00 - CST 1958 Apr 27 2:00
429 Link America/Indianapolis America/Indiana/Indianapolis
431 # Part of Crawford County, Indiana, last observed DST in 1975,
432 # and left its clocks alone in 1974.
433 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
434 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
435 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
436 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
437 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
438 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
439 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
441 -6:00 Marengo C%sT 1961 Apr 30 2:00
443 -5:00 US E%sT 1974 Jan 6 2:00
444 -6:00 1:00 CDT 1974 Oct 27 2:00
448 # Starke County, Indiana
449 # From Arthur David Olson (1991-10-28):
450 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
451 # notes that Starke County switched from Central time to Eastern time as of
453 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
454 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
455 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
456 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
457 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
458 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
459 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
460 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
462 -6:00 Starke C%sT 1962 Apr 29 2:00
463 -5:00 - EST 1963 Oct 27 2:00
464 -6:00 US C%sT 1991 Oct 27 2:00
467 # Switzerland County, Indiana, last observed DST in 1972.
468 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
469 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
470 -6:00 US C%sT 1954 Apr 25 2:00
475 # Part of Kentucky left its clocks alone in 1974.
476 # This also includes a part of Indiana immediately adjacent to Louisville.
477 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
478 Rule Louisville 1921 only - May 1 2:00 1:00 D
479 Rule Louisville 1921 only - Sep 1 2:00 0 S
480 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
481 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
482 Rule Louisville 1946 only - Jun 2 2:00 0 S
483 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
484 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
485 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
486 Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
488 -6:00 Louisville C%sT 1942
490 -6:00 Louisville C%sT 1961 Jul 23 2:00
492 -5:00 US E%sT 1974 Jan 6 2:00
493 -6:00 1:00 CDT 1974 Oct 27 2:00
495 Link America/Louisville America/Kentucky/Louisville
497 # Wayne, Clinton, and Russell Counties, Kentucky
500 # <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
501 # Lake Cumberland LIFE
502 # </a> (1999-01-29) via WKYM-101.7:
503 # Clinton County has joined Wayne County in asking the DoT to change from
504 # the Central to the Eastern time zone.... The Wayne County government made
505 # the same request in December. And while Russell County officials have not
506 # taken action, the majority of respondents to a poll conducted there in
507 # August indicated they would like to change to "fast time" also.
508 # The three Lake Cumberland counties are the farthest east of any U.S.
509 # location in the Central time zone.
511 # From Rich Wales (2000-08-29):
512 # After prolonged debate, and despite continuing deep differences of opinion,
513 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
514 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
515 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
516 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00
519 -6:00 US C%sT 2000 Oct 29 2:00
523 # From Rives McDow (2000-08-30):
524 # Here ... are all the changes in the US since 1985.
525 # Kearny County, KS (put all of county on central;
526 # previously split between MST and CST) ... 1990-10
527 # Starke County, IN (from CST to EST) ... 1991-10
528 # Oliver County, ND (from MST to CST) ... 1992-10
529 # West Wendover, NV (from PST TO MST) ... 1999-10
530 # Wayne County, KY (from CST to EST) ... 2000-10
531 # There is another change in the offing; Mercer County, ND is looking
532 # to change from MT to CT. It is possible that two other ND counties
533 # (Sioux and Morton) will look to change also. If made, the earliest
534 # a change would be effective is October 2001.
536 # From Paul Eggert (2000-10-02):
537 # FIXME: I haven't yet had time to incorporate all the above changes.
541 # From Bob Devine (1988-01-28):
542 # Michigan didn't observe DST from 1968 to 1973.
544 # From Paul Eggert (1999-03-31):
545 # Shanks writes that Michigan started using standard time on 1885-09-18,
546 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
549 # local time until 1900 when the City Council decreed that clocks should
550 # be put back twenty-eight minutes to Central Standard Time. Half the
551 # city obeyed, half refused. After considerable debate, the decision
552 # was rescinded and the city reverted to Sun time. A derisive offer to
553 # erect a sundial in front of the city hall was referred to the
554 # Committee on Sewers. Then, in 1905, Central time was adopted
557 # This story is too entertaining to be false, so go with Howse over Shanks.
559 # From Paul Eggert (2001-03-06):
560 # Garland (1927) writes ``Cleveland and Detroit advanced their clocks
561 # one hour in 1914.'' This change is not in Shanks. We have no more
562 # info, so omit this for now.
564 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
565 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
566 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
567 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
568 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
569 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
570 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
571 Zone America/Detroit -5:32:11 - LMT 1905
572 -6:00 - CST 1915 May 15 2:00
575 -5:00 Detroit E%sT 1973
577 -5:00 - EST 1975 Apr 27 2:00
580 # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
581 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
582 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
583 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
584 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
585 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
586 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
587 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
589 -6:00 Menominee C%sT 1969 Apr 27 2:00
590 -5:00 - EST 1973 Apr 29 2:00
594 # claimed by US under the provisions of the 1856 Guano Islands Act
595 # also claimed by Haiti
596 # occupied 1857/1900 by the Navassa Phosphate Co
597 # US lighthouse 1917/1997-01
598 # currently uninhabited
599 # see Mark Fineman, ``An Isle Rich in Guano and Discord'',
600 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
601 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
603 # Old names, for S5 users
605 # Link LINK-FROM LINK-TO
606 Link America/New_York EST5EDT
607 Link America/Chicago CST6CDT
608 Link America/Denver MST7MDT
609 Link America/Los_Angeles PST8PDT
610 Link America/Indianapolis EST
611 Link America/Phoenix MST
612 Link Pacific/Honolulu HST
614 ################################################################################
617 # From Paul Eggert <eggert@twinsun.com> (1999-10-29):
618 # A good source for time zone historical data outside the US is
619 # Thomas G. Shanks, The International Atlas (5th edition),
620 # San Diego: ACS Publications, Inc. (1999).
622 # Gwillim Law <Gwil_Law@bridge-point.com> writes that a good source
623 # for recent time zone data is the International Air Transport
624 # Association's Standard Schedules Information Manual (IATA SSIM),
625 # published semiannually. Law sent in several helpful summaries
626 # of the IATA's data after 1990.
628 # Except where otherwise noted, Shanks is the source for entries through 1990,
629 # and IATA SSIM is the source for entries after 1990.
631 # Another source occasionally used is Edward W. Whitman, World Time Differences,
632 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
633 # I found in the UCLA library.
635 # See the `europe' file for Greenland.
639 # From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
640 # I post here the time zone abbreviations standardized in Canada
641 # for both English and French in the CAN/CSA-Z234.4-89 standard....
643 # UTC Standard time Daylight savings time
644 # offset French English French English
655 # HN: Heure Normale ST: Standard Time
656 # HA: Heure Avanc<e'>e DT: Daylight saving Time
658 # A: de l'Atlantique Atlantic
659 # C: du Centre Central
660 # E: de l'Est Eastern
663 # P: du Pacifique Pacific
668 # From Paul Eggert <eggert@twinsun.com> (1994-11-22):
669 # Alas, this sort of thing must be handled by localization software.
671 # Unless otherwise specified, the data for Canada are all from Shanks.
673 # From Paul Eggert (2000-10-02):
674 # H. David Matthews and Mary Vincent's map
675 # <a href="http://www.canadiangeographic.ca/SO98/geomap.htm">
676 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
677 # </a> contains detailed boundaries for regions observing nonstandard
678 # time and daylight saving time arrangements in Canada circa 1998.
680 # INMS, the Institute for National Measurement Standards in Ottawa, has
681 # <a href="http://www.nrc.ca/inms/time/tze.html">
682 # information about standard and daylight saving time zones in Canada.
683 # </a> (updated periodically).
684 # Its unofficial information is often taken from Matthews and Vincent.
686 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
687 Rule Canada 1918 only - Apr 14 2:00 1:00 D
688 Rule Canada 1918 only - Oct 31 2:00 0 S
689 Rule Canada 1942 only - Feb 9 2:00 1:00 W
690 Rule Canada 1945 only - Sep 30 2:00 0 S
691 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
692 Rule Canada 1974 max - Oct lastSun 2:00 0 S
693 Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
696 # Newfoundland (and far southeast Labrador)
698 # From Paul Eggert (2000-10-02):
699 # Matthews and Vincent (1998) write that Labrador should use NST/NDT,
700 # but the only part of Labrador that follows the rules is the
701 # southeast corner, including Port Hope Simpson and Mary's Harbour,
702 # but excluding, say, Black Tickle.
704 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
705 Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
706 Rule StJohns 1917 only - Sep 17 2:00 0 S
707 Rule StJohns 1918 only - Oct 31 2:00 0 S
708 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
709 Rule StJohns 1919 only - May 5 23:00 1:00 D
710 Rule StJohns 1919 only - Aug 12 23:00 0 S
711 # For 1931-1935 Whitman gives Apr same date; go with Shanks.
712 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
713 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
714 # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
715 Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
716 Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
717 # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
718 Rule StJohns 1942 only - Mar 1 0:00 1:00 W
719 Rule StJohns 1942 only - Dec 31 0:00 0 S
720 Rule StJohns 1943 only - May 30 0:00 1:00 W
721 Rule StJohns 1943 only - Sep 5 0:00 0 S
722 Rule StJohns 1944 only - Jul 10 0:00 1:00 W
723 Rule StJohns 1944 only - Sep 2 0:00 0 S
724 Rule StJohns 1945 only - Jan 1 0:00 1:00 W
725 Rule StJohns 1945 only - Oct 7 2:00 0 S
726 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
727 # Apr 30 - Sep 24; go with Shanks.
728 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
729 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
730 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
731 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
732 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
733 # From Paul Eggert (2000-10-02):
734 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
735 # at 00:01 local time. For now, assume it started in 1987.
736 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
737 Rule StJohns 1987 max - Oct lastSun 0:01 0 S
738 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
739 Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D
740 # St John's has an apostrophe, but Posix file names can't have apostrophes.
741 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
742 Zone America/St_Johns -3:30:52 - LMT 1884
743 -3:30:52 StJohns N%sT 1935 Mar 30
747 # most of east Labrador
749 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
750 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
751 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
752 -3:30:52 StJohns NST 1919
753 -3:30:52 - NST 1935 Mar 30
755 -3:30 StJohns N%sT 1966 Mar 15 2:00
759 # west Labrador, New Brunswick, Nova Scotia, Prince Edward I
761 # From Paul Eggert (1996-06-12):
762 # Shanks writes that since 1970 most of this region has been like Halifax.
763 # Many locales did not observe peacetime DST until 1972;
764 # Glace Bay, NS is the largest that we know of.
765 # Shanks also writes that Liverpool, NS was the only town in Canada to observe
766 # DST in 1971 but not 1970; for now we'll assume this is a typo.
768 # From Paul Eggert (2000-10-02):
769 # INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches
770 # at 00:01 local time. FIXME: verify and create a new Zone for this.
773 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
774 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
775 Rule Halifax 1916 only - Oct 1 0:00 0 S
776 Rule Halifax 1918 only - Apr 14 2:00 1:00 D
777 Rule Halifax 1918 only - Oct 31 2:00 0 S
778 Rule Halifax 1920 only - May 9 0:00 1:00 D
779 Rule Halifax 1920 only - Aug 29 0:00 0 S
780 Rule Halifax 1921 only - May 6 0:00 1:00 D
781 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
782 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
783 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
784 Rule Halifax 1923 only - Sep 4 0:00 0 S
785 Rule Halifax 1924 only - Sep 15 0:00 0 S
786 Rule Halifax 1925 only - Sep 28 0:00 0 S
787 Rule Halifax 1926 only - May 16 0:00 1:00 D
788 Rule Halifax 1926 only - Sep 13 0:00 0 S
789 Rule Halifax 1927 only - May 1 0:00 1:00 D
790 Rule Halifax 1927 only - Sep 26 0:00 0 S
791 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
792 Rule Halifax 1928 only - Sep 9 0:00 0 S
793 Rule Halifax 1929 only - Sep 3 0:00 0 S
794 Rule Halifax 1930 only - Sep 15 0:00 0 S
795 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
796 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
797 Rule Halifax 1933 only - Oct 2 0:00 0 S
798 Rule Halifax 1934 only - May 20 0:00 1:00 D
799 Rule Halifax 1934 only - Sep 16 0:00 0 S
800 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
801 Rule Halifax 1935 only - Sep 30 0:00 0 S
802 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
803 Rule Halifax 1936 only - Sep 14 0:00 0 S
804 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
805 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
806 Rule Halifax 1939 only - May 28 0:00 1:00 D
807 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
808 Rule Halifax 1942 only - Feb 9 2:00 1:00 W
809 Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
810 Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
811 Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
812 Rule Halifax 1962 max - Oct lastSun 2:00 0 S
813 Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
814 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
815 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
817 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
818 -4:00 Canada A%sT 1953
819 -4:00 Halifax A%sT 1954
826 # From Paul Eggert (1996-06-12):
827 # Shanks writes that since 1970 most of this region has been like Montreal.
828 # Thunder Bay skipped DST in 1973.
829 # Many smaller locales did not observe peacetime DST until 1974;
830 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
831 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
833 # From Paul Eggert (1997-10-17):
834 # msb@sq.com writes that an article in the 1997-10-14 Toronto Star
835 # says that Atikokan, Ontario currently does not observe DST,
836 # but will vote on 11-10 whether to use EST/EDT.
837 # He also writes that the
838 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
839 # Ontario Time Act (1990, Chapter T.9)
841 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
842 # Officially Atikokan is therefore on CST/CDT, and most likely this report
843 # concerns a non-official time observed as a matter of local practice.
844 # For what it's worth, Shanks says that Atikokan has agreed with
845 # Rainy River ever since standard time was introduced.
847 # From Paul Eggert (2000-10-02):
848 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
849 # New Osnaburgh observe CST all year, that Big Trout Lake observes
850 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
851 # violation of the official Ontario rules.
852 # They also write that Quebec east of the -63 meridian is supposed to
853 # observe AST, but residents as far east as Natashquan use EST/EDT,
854 # and residents east of Natashquan use AST.
855 # We probably need Zones for far east Quebec and for Atikokan,
856 # but we don't know when their practices started.
858 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
859 Rule Mont 1917 only - Mar 25 2:00 1:00 D
860 Rule Mont 1917 only - Apr 24 0:00 0 S
861 Rule Mont 1918 only - Apr 14 2:00 1:00 D
862 Rule Mont 1918 only - Oct 31 2:00 0 S
863 Rule Mont 1919 only - Mar 31 2:30 1:00 D
864 Rule Mont 1919 only - Oct 25 2:30 0 S
865 Rule Mont 1920 only - May 2 2:30 1:00 D
866 Rule Mont 1920 only - Oct 3 2:30 0 S
867 Rule Mont 1921 only - May 1 2:00 1:00 D
868 Rule Mont 1921 only - Oct 2 2:30 0 S
869 Rule Mont 1922 only - Apr 30 2:00 1:00 D
870 Rule Mont 1922 only - Oct 1 2:30 0 S
871 Rule Mont 1924 only - May 17 2:00 1:00 D
872 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
873 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
874 Rule Mont 1927 only - May 1 0:00 1:00 D
875 Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
876 Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
877 Rule Mont 1932 only - May 1 0:00 1:00 D
878 Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
879 Rule Mont 1933 only - Oct 1 0:00 0 S
880 Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
881 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
882 Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
883 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
884 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
885 Rule Mont 1957 max - Oct lastSun 2:00 0 S
886 Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
887 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
888 Zone America/Montreal -4:54:16 - LMT 1884
890 Zone America/Thunder_Bay -5:57:00 - LMT 1895
891 -5:00 Canada E%sT 1970
895 Zone America/Nipigon -5:53:04 - LMT 1895
897 Zone America/Rainy_River -6:17:56 - LMT 1895
903 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
904 Rule Winn 1916 only - Apr 23 0:00 1:00 D
905 Rule Winn 1916 only - Sep 17 0:00 0 S
906 Rule Winn 1918 only - Apr 14 2:00 1:00 D
907 Rule Winn 1918 only - Oct 31 2:00 0 S
908 Rule Winn 1937 only - May 16 2:00 1:00 D
909 Rule Winn 1937 only - Sep 26 2:00 0 S
910 Rule Winn 1942 only - Feb 9 2:00 1:00 W
911 Rule Winn 1945 only - Sep lastSun 2:00 0 S
912 Rule Winn 1946 only - May 12 2:00 1:00 D
913 Rule Winn 1946 only - Oct 13 2:00 0 S
914 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
915 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
916 Rule Winn 1950 only - May 1 2:00 1:00 D
917 Rule Winn 1950 only - Sep 30 2:00 0 S
918 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
919 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
920 Rule Winn 1959 only - Oct lastSun 2:00 0 S
921 Rule Winn 1960 only - Sep lastSun 2:00 0 S
922 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
923 Rule Winn 1963 only - Sep 22 2:00 0 S
924 Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
925 Rule Winn 1966 1986 - Oct lastSun 2:00 0 S
926 Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
927 # From Paul Eggert (2000-10-02):
928 # INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from
929 # DST at 03:00 local time. For now, assume it started in 1987.
930 Rule Winn 1987 max - Oct lastSun 2:00s 0 S
931 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
932 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
938 # From Paul Eggert (2000-10-02):
939 # Shanks writes that since 1970 most of this region has been like Regina.
940 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
941 # Other western towns (e.g. Lloydminster) are like Edmonton.
942 # Matthews and Vincent (1998) write that Denare Beach and Creighton
943 # are like Winnipeg, in violation of Saskatchewan law.
945 # From W. Jones <jones@skdad.usask.ca> (1992-11-06):
946 # The. . .below is based on information I got from our law library, the
947 # provincial archives, and the provincial Community Services department.
948 # A precise history would require digging through newspaper archives, and
949 # since you didn't say what you wanted, I didn't bother.
951 # Saskatchewan is split by a time zone meridian (105W) and over the years
952 # the boundary became pretty ragged as communities near it reevaluated
953 # their affiliations in one direction or the other. In 1965 a provincial
954 # referendum favoured legislating common time practices.
956 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
957 # Saskatchewan 1978) was proclaimed, and established that the eastern
958 # part of Saskatchewan would use CST year round, that districts in
959 # northwest Saskatchewan would by default follow CST but could opt to
960 # follow Mountain Time rules (thus 1 hour difference in the winter and
961 # zero in the summer), and that districts in southwest Saskatchewan would
962 # by default follow MT but could opt to follow CST.
964 # It took a few years for the dust to settle (I know one story of a town
965 # on one time zone having its school in another, such that a mom had to
966 # serve her family lunch in two shifts), but presently it seems that only
967 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
968 # rules any more; all other districts appear to have used CST year round
969 # since sometime in the 1960s.
971 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
972 Rule Regina 1918 only - Apr 14 2:00 1:00 D
973 Rule Regina 1918 only - Oct 31 2:00 0 S
974 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
975 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
976 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
977 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
978 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
979 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
980 Rule Regina 1942 only - Feb 9 2:00 1:00 W
981 Rule Regina 1945 only - Sep lastSun 2:00 0 S
982 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
983 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
984 Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
985 Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
986 Rule Regina 1959 only - Oct lastSun 2:00 0 S
988 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
989 Rule Swift 1957 only - Oct lastSun 2:00 0 S
990 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
991 Rule Swift 1959 only - Oct lastSun 2:00 0 S
992 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
993 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
994 Zone America/Regina -6:58:36 - LMT 1905 Sep
995 -7:00 Regina M%sT 1960 Apr lastSun 2:00
997 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
998 -7:00 Canada M%sT 1946 Apr lastSun 2:00
999 -7:00 Regina M%sT 1950
1000 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1006 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1007 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1008 Rule Edm 1918 only - Oct 31 2:00 0 S
1009 Rule Edm 1919 only - May 27 2:00 0 S
1010 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1011 Rule Edm 1920 only - Oct lastSun 2:00 0 S
1012 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1013 Rule Edm 1942 only - Feb 9 2:00 1:00 W
1014 Rule Edm 1945 only - Sep lastSun 2:00 0 S
1015 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1016 Rule Edm 1947 only - Sep lastSun 2:00 0 S
1017 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1018 Rule Edm 1967 only - Oct lastSun 2:00 0 S
1019 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1020 Rule Edm 1969 only - Oct lastSun 2:00 0 S
1021 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1022 Rule Edm 1972 max - Oct lastSun 2:00 0 S
1023 Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
1024 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1025 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1031 # From Paul Eggert (2000-10-02):
1032 # Shanks writes that since 1970 most of this region has been like Vancouver.
1033 # Dawson Creek uses MST. Much of east BC is like Edmonton.
1034 # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1036 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1037 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1038 Rule Vanc 1918 only - Oct 31 2:00 0 S
1039 Rule Vanc 1942 only - Feb 9 2:00 1:00 W
1040 Rule Vanc 1945 only - Sep 30 2:00 0 S
1041 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1042 Rule Vanc 1946 only - Oct 13 2:00 0 S
1043 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1044 Rule Vanc 1962 max - Oct lastSun 2:00 0 S
1045 Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
1046 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1047 Zone America/Vancouver -8:12:28 - LMT 1884
1049 Zone America/Dawson_Creek -8:00:56 - LMT 1884
1050 -8:00 Canada P%sT 1947
1051 -8:00 Vanc P%sT 1972 Aug 30 2:00
1055 # Northwest Territories, Nunavut, Yukon
1057 # From Paul Eggert (1999-10-29):
1058 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1059 # Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
1060 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1061 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
1062 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1063 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1064 # * O.I.C. 1980/02 established DST.
1065 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1066 # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
1068 # From Rives McDow (1999-09-04):
1069 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
1070 # <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1071 # Nunavut moves to single time zone Oct. 31
1074 # From Antoine Leca (1999-09-06):
1075 # We then need to create a new timezone for the Kitikmeot region of Nunavut
1076 # to differentiate it from the Yellowknife region.
1078 # From Paul Eggert (1999-09-20):
1079 # <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1080 # Basic Facts: The New Territory
1081 # </a> (1999) reports that Pangnirtung operates on Eastern time,
1082 # and that Coral Harbour does not observe DST. We don't know when
1083 # Pangnirtung switched to Eastern time; we'll guess 1995.
1084 # We'll ignore the claim about Coral Harbour for now,
1085 # since we have no further info.
1087 # From Rives McDow (1999-11-08):
1088 # On October 31, when the rest of Nunavut went to Central time,
1089 # Pangnirtung wobbled. Here is the result of their wobble:
1091 # The following businesses and organizations in Pangnirtung use Central Time:
1093 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1094 # Eastern Arctic National Parks, A & D Specialist
1096 # The following businesses and organizations in Pangnirtung use Eastern Time:
1098 # Hamlet office, All other businesses, Both schools, Airport operator
1100 # This has made for an interesting situation there, which warranted the news.
1101 # No one there that I spoke with seems concerned, or has plans to
1102 # change the local methods of keeping time, as it evidently does not
1103 # really interfere with any activities or make things difficult locally.
1104 # They plan to celebrate New Year's turn-over twice, one hour apart,
1105 # so it appears that the situation will last at least that long.
1106 # The Nunavut Intergovernmental Affairs hopes that they will "come to
1107 # their senses", but the locals evidently don't see any problem with
1108 # the current state of affairs.
1110 # From Michaela Rodrigue, writing in the
1111 # <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1112 # Nunatsiaq News (1999-11-19)</a>:
1113 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1114 # central - or Nunavut time - for government offices, and eastern time
1115 # for municipal offices and schools.... Igloolik [was similar but then]
1116 # made the switch to central time on Saturday, Nov. 6.
1118 # From Paul Eggert (2000-10-02):
1119 # Matthews and Vincent (1998) say the following, but we lack histories
1120 # for these potential new Zones.
1122 # The Canadian Forces station at Alert uses Eastern Time while the
1123 # handful of residents at the Eureka weather station [in the Central
1124 # zone] skip daylight savings. Baffin Island, which is crossed by the
1125 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
1126 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1127 # Central Time and Southampton Island [in the Central zone] is not
1128 # required to use daylight savings.
1131 # <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1132 # Nunavut now has two time zones
1133 # </a> (2000-11-10):
1134 # The Nunavut government would allow its employees in Kugluktuk and
1135 # Cambridge Bay to operate on central time year-round, putting them
1136 # one hour behind the rest of Nunavut for six months during the winter.
1137 # At the end of October the two communities had rebelled against
1138 # Nunavut's unified time zone, refusing to shift to eastern time with
1139 # the rest of the territory for the winter. Cambridge Bay remained on
1140 # central time, while Kugluktuk, even farther west, reverted to
1141 # mountain time, which they had used before the advent of Nunavut's
1142 # unified time zone in 1999.
1144 # From Rives McDow (2001-01-20), quoting the Nunavut government:
1145 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1147 # From Paul Eggert (2000-12-04):
1148 # Let's just keep track of the official times for now.
1150 # From Rives McDow (2001-03-07):
1151 # The premier of Nunavut has issued a ministerial statement advising
1152 # that effective 2001-04-01, the territory of Nunavut will revert
1153 # back to three time zones (mountain, central, and eastern). Of the
1154 # cities in Nunavut, Coral Harbor is the only one that I know of that
1155 # has said it will not observe dst, staying on EST year round. I'm
1156 # checking for more info, and will get back to you if I come up with
1158 # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
1160 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1161 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
1162 Rule NT_YK 1918 only - Oct 27 2:00 0 S
1163 Rule NT_YK 1919 only - May 25 2:00 1:00 D
1164 Rule NT_YK 1919 only - Nov 1 0:00 0 S
1165 Rule NT_YK 1942 only - Feb 9 2:00 1:00 W
1166 Rule NT_YK 1945 only - Sep 30 2:00 0 S
1167 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
1168 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
1169 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
1170 Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
1171 Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
1172 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1173 Zone America/Pangnirtung -4:22:56 - LMT 1884
1174 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
1175 -5:00 Canada E%sT 1999 Oct 31 2:00
1176 -6:00 Canada C%sT 2000 Oct 29 2:00
1178 Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987
1179 -5:00 NT_YK E%sT 1999 Oct 31 2:00
1180 -6:00 Canada C%sT 2000 Oct 29 2:00
1182 Zone America/Rankin_Inlet -6:08:40 - LMT 1884
1183 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1184 -5:00 - EST 2001 Apr 1 3:00
1186 Zone America/Cambridge_Bay -7:00:20 - LMT 1884
1187 -7:00 NT_YK M%sT 1999 Oct 31 2:00
1188 -6:00 Canada C%sT 2000 Oct 29 2:00
1189 -5:00 - EST 2000 Nov 5 0:00
1190 -6:00 - CST 2001 Apr 1 3:00
1192 Zone America/Yellowknife -7:37:24 - LMT 1884
1194 Zone America/Inuvik -8:54:00 - LMT 1884
1195 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
1197 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
1198 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
1200 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
1201 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
1205 ###############################################################################
1209 # From Paul Eggert (2001-03-05):
1210 # The Investigation and Analysis Service of the
1211 # Mexican Library of Congress (MLoC) has published a
1212 # <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
1213 # history of Mexican local time (in Spanish)
1216 # Here are the discrepancies between Shanks and the MLoC.
1217 # (In all cases we go with the MLoC.)
1218 # Shanks reports that Baja was at -8:00 in 1922/1923.
1219 # Shanks says the 1930 transition in Baja was 1930-11-16.
1220 # Shanks reports no DST during summer 1931.
1221 # Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01.
1222 # Shanks does not report transitions for Baja in 1945 or 1948.
1223 # Shanks reports southern Mexico transitions on 1981-12-01, not 12-23.
1224 # Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00
1225 # on 1997-10-26 at 02:00.
1227 # From Gwillim Law (2001-02-20):
1228 # There are some other discrepancies between the Decrees page and the
1229 # tz database. I think they can best be explained by supposing that
1230 # the researchers who prepared the Decrees page failed to find some of
1231 # the relevant documents.
1233 # From Paul Eggert (2000-07-26):
1234 # Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981
1235 # and 1988 DST experiments. Go with spin.com.mx.
1237 # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1238 # A guy from our Mexico subsidiary finally found the Presidential Decree
1239 # outlining the timezone changes in Mexico.
1241 # ------------- Begin Forwarded Message -------------
1243 # I finally got my hands on the Official Presidential Decree that sets up the
1244 # rules for the DST changes. The rules are:
1246 # 1. The country is divided in 3 timezones:
1247 # - Baja California Norte (the Mexico/BajaNorte TZ)
1248 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1249 # - The rest of the country (the Mexico/General TZ)
1251 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1252 # at 2:00 AM, the times in each zone are as follows:
1257 # 3. The rest of the year, the times are as follows:
1262 # The Decree was published in Mexico's Official Newspaper on January 4th.
1264 # -------------- End Forwarded Message --------------
1265 # From Paul Eggert (1996-06-12):
1266 # For an English translation of the decree, see
1267 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
1268 # ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1271 # From Rives McDow (1998-10-08):
1272 # The State of Quintana Roo has reverted back to central STD and DST times
1273 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
1275 # From Rives McDow (2000-01-10):
1276 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1277 # zone 5 hours from the International Date Line, and will not observe daylight
1278 # savings time so as to stay on the same time zone as the southern part of
1279 # Arizona year round.
1281 # From Jesper Norgaard, translating
1282 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
1283 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
1284 # Syndicate of Education Workers, refuse to apply daylight saving each
1285 # year, so that the more than 10,000 schools work at normal hour the
1288 # From Gwillim Law (2001-01-19):
1289 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
1291 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
1292 # that Summer Time will be reduced from seven to five months, starting
1294 # <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
1295 # [translated], says "summer time will ... take effect on the first Sunday
1296 # in May, and end on the last Sunday of September.
1298 # From Arthur David Olson (2001-01-25):
1299 # The 2001-01-24 traditional Washington Post contained the page one
1300 # story "Timely Issue Divides Mexicans."...
1301 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
1302 # ... Mexico City Mayor Lopez Obrador "...is threatening to keep
1303 # Mexico City and its 20 million residents on a different time than
1304 # the rest of the country..." In particular, Lopez Obrador would abolish
1305 # observation of Daylight Saving Time.
1307 # <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
1308 # Official statute published by the Energy Department
1309 # </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
1310 # and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
1312 # From Paul Eggert (2001-03-03):
1314 # <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
1315 # James F. Smith writes in today's LA Times
1317 # * Sonora will continue to observe standard time.
1318 # * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
1319 # the Federal District will not adopt DST.
1320 # * 4 of 16 district leaders announced they'll ignore the decree.
1321 # * The decree does not affect federal-controlled facilities including
1322 # the airport, banks, hospitals, and schools.
1324 # For now we'll assume that the Federal District will bow to federal rules.
1326 # From Jesper Norgaard (2001-04-01):
1327 # I found some references to the Mexican application of daylight
1328 # saving, which modifies what I had already sent you, stating earlier
1329 # that a number of northern Mexican states would go on daylight
1330 # saving. The modification reverts this to only cover Baja California
1331 # (Norte), while all other states (except Sonora, who has no daylight
1332 # saving all year) will follow the original decree of president
1333 # Vicente Fox, starting daylight saving May 6, 2001 and ending
1334 # September 30, 2001.
1335 # References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
1336 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
1338 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1339 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1340 Rule Mexico 1939 only - Jun 25 0:00 0 S
1341 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1342 Rule Mexico 1941 only - Apr 1 0:00 0 S
1343 Rule Mexico 1943 only - Dec 16 0:00 1:00 W
1344 Rule Mexico 1944 only - May 1 0:00 0 S
1345 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1346 Rule Mexico 1950 only - Jul 30 0:00 0 S
1347 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
1348 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
1349 Rule Mexico 2001 max - May Sun>=1 2:00 1:00 D
1350 Rule Mexico 2001 max - Sep lastSun 2:00 0 S
1351 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1353 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1354 -6:00 - CST 1981 Dec 23
1355 -5:00 Mexico E%sT 1998 Aug 2 2:00
1358 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
1359 -6:00 - CST 1981 Dec 23
1360 -5:00 - EST 1982 Dec 2
1362 # Coahuila, Durango, Nuevo Leon, Tamaulipas
1363 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
1368 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1369 -7:00 - MST 1927 Jun 10 23:00
1370 -6:00 - CST 1930 Nov 15
1371 -7:00 - MST 1931 May 1 23:00
1372 -6:00 - CST 1931 Oct
1373 -7:00 - MST 1932 Apr 1
1376 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
1377 -7:00 - MST 1927 Jun 10 23:00
1378 -6:00 - CST 1930 Nov 15
1379 -7:00 - MST 1931 May 1 23:00
1380 -6:00 - CST 1931 Oct
1381 -7:00 - MST 1932 Apr 1
1383 -6:00 Mexico C%sT 1998
1384 -6:00 - CST 1998 Apr Sun>=1 3:00
1387 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1388 -7:00 - MST 1927 Jun 10 23:00
1389 -6:00 - CST 1930 Nov 15
1390 -7:00 - MST 1931 May 1 23:00
1391 -6:00 - CST 1931 Oct
1392 -7:00 - MST 1932 Apr 1
1393 -6:00 - CST 1942 Apr 24
1394 -7:00 - MST 1949 Jan 14
1396 -7:00 Mexico M%sT 1999
1398 # Baja California Sur, Nayarit, Sinaloa
1399 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1400 -7:00 - MST 1927 Jun 10 23:00
1401 -6:00 - CST 1930 Nov 15
1402 -7:00 - MST 1931 May 1 23:00
1403 -6:00 - CST 1931 Oct
1404 -7:00 - MST 1932 Apr 1
1405 -6:00 - CST 1942 Apr 24
1406 -7:00 - MST 1949 Jan 14
1410 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1412 -8:00 - PST 1927 Jun 10 23:00
1413 -7:00 - MST 1930 Nov 15
1414 -8:00 - PST 1931 Apr 1
1415 -8:00 1:00 PDT 1931 Sep 30
1416 -8:00 - PST 1942 Apr 24
1417 -8:00 1:00 PWT 1945 Nov 12
1418 -8:00 - PST 1948 Apr 5
1419 -8:00 1:00 PDT 1949 Jan 14
1424 -8:00 Mexico P%sT 2001
1426 # From Paul Eggert (2001-03-05):
1427 # Formerly there was an America/Ensenada zone, which differed from
1428 # America/Tijuana only in that it did not observe DST from 1976
1429 # through 1995. This was as per Shanks. However, Guy Harris reports
1430 # that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
1431 # Tijuana observe DST," which contradicts Shanks but does imply that
1432 # DST-observance was a town-by-town matter back then. This concerns
1433 # data after 1970 so most likely there should be at least one Zone
1434 # other than America/Tijuana for Baja, but it's not clear yet what its
1435 # name or contents should be.
1440 ###############################################################################
1443 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1444 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1447 # Antigua and Barbuda
1448 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1449 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1454 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1455 Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1456 Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1457 Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1458 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1459 Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1463 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1464 Rule Barb 1977 only - Jun 12 2:00 1:00 D
1465 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1466 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1467 Rule Barb 1979 only - Sep 30 2:00 0 S
1468 Rule Barb 1980 only - Sep 25 2:00 0 S
1469 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1470 Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1471 -3:58:28 - BMT 1932 # Bridgetown Mean Time
1475 # Whitman entirely disagrees with Shanks; go with Shanks.
1476 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1477 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1478 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1479 Rule Belize 1973 only - Dec 5 0:00 1:00 D
1480 Rule Belize 1974 only - Feb 9 0:00 0 S
1481 Rule Belize 1982 only - Dec 18 0:00 1:00 D
1482 Rule Belize 1983 only - Feb 12 0:00 0 S
1483 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1484 Zone America/Belize -5:52:48 - LMT 1912 Apr
1488 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1489 Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1490 -4:00 - AST 1974 Apr 28 2:00
1494 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1495 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1496 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1500 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1501 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1502 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1503 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1504 # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1505 Rule CR 1991 only - Jul 1 0:00 0 S
1506 Rule CR 1992 only - Mar 15 0:00 0 S
1507 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1508 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1509 Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1510 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
1513 # no information; probably like America/Costa_Rica
1517 # From Arthur David Olson (1999-03-29):
1518 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
1519 # the Cuban National Team and the Baltimore Orioles was carried live on
1520 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
1521 # During the game, play-by-play announcer Jim Hunter noted that
1522 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
1523 # Time today." (The "two hour" remark referred to losing one hour of
1524 # sleep on 1999-03-28--when the announcers were in Cuba as it switched
1525 # to DST--and one more hour on 1999-04-04--when the announcers will have
1526 # returned to Baltimore, which switches on that date.)
1528 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1529 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1530 Rule Cuba 1928 only - Oct 10 0:00 0 S
1531 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1532 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1533 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1534 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1535 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1536 Rule Cuba 1965 only - Sep 30 0:00 0 S
1537 Rule Cuba 1966 only - May 29 0:00 1:00 D
1538 Rule Cuba 1966 only - Oct 2 0:00 0 S
1539 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1540 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1541 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1542 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1543 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1544 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1545 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1546 Rule Cuba 1978 only - May 7 0:00 1:00 D
1547 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1548 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1549 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1550 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1551 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
1552 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1553 Rule Cuba 1996 only - Oct 6 0:00s 0 S
1554 Rule Cuba 1997 only - Oct 12 0:00s 0 S
1555 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
1556 Rule Cuba 1998 max - Oct lastSun 0:00s 0 S
1557 Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D
1559 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1560 Zone America/Havana -5:29:28 - LMT 1890
1561 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
1565 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1566 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1569 # Dominican Republic
1571 # From Steffen Thorsen (2000-10-30):
1572 # Enrique Morales reported to me that the Dominican Republic has changed the
1573 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
1574 # http://www.listin.com.do/antes/261000/republica/princi.html
1576 # From Paul Eggert (2000-12-04):
1577 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
1579 # From Rives McDow (2000-12-01):
1580 # Dominican Republic changed its mind and presidential decree on Tuesday,
1581 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
1582 # Dominican Republic will be reverting to 8 hours from the International Date
1583 # Line, and will not be using DST in the foreseeable future. The reason they
1584 # decided to use DST was to be in synch with Puerto Rico, who was also going
1585 # to implement DST. When Puerto Rico didn't implement DST, the president
1586 # decided to revert.
1589 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1590 Rule DR 1966 only - Oct 30 0:00 1:00 D
1591 Rule DR 1967 only - Feb 28 0:00 0 S
1592 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1593 Rule DR 1970 only - Feb 21 0:00 0 S
1594 Rule DR 1971 only - Jan 20 0:00 0 S
1595 Rule DR 1972 1974 - Jan 21 0:00 0 S
1596 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1597 Zone America/Santo_Domingo -4:39:36 - LMT 1890
1598 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1599 -5:00 DR E%sT 1974 Oct 27
1600 -4:00 - AST 2000 Oct 29 02:00
1601 -5:00 US E%sT 2000 Dec 3 01:00
1605 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1606 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1607 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1608 # There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1609 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1610 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1614 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1615 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1619 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1620 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1624 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1625 Rule Guat 1973 only - Nov 25 0:00 1:00 D
1626 Rule Guat 1974 only - Feb 24 0:00 0 S
1627 Rule Guat 1983 only - May 21 0:00 1:00 D
1628 Rule Guat 1983 only - Sep 22 0:00 0 S
1629 Rule Guat 1991 only - Mar 23 0:00 1:00 D
1630 Rule Guat 1991 only - Sep 7 0:00 0 S
1631 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1632 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1636 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1637 Rule Haiti 1983 only - May 8 0:00 1:00 D
1638 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1639 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1640 # Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA.
1641 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
1642 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
1643 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1644 Zone America/Port-au-Prince -4:49:20 - LMT 1890
1645 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1649 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1650 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1651 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1654 # Great Swan I ceded by US to Honduras in 1972
1658 # From Bob Devine (1988-01-28):
1661 # From U. S. Naval Observatory (1989-01-19):
1662 # JAMAICA 5 H BEHIND UTC
1665 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1666 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1667 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1668 -5:00 - EST 1974 Apr 28 2:00
1673 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1674 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1675 -4:04 - FFMT 1911 May # Fort-de-France MT
1676 -4:00 - AST 1980 Apr 6
1677 -4:00 1:00 ADT 1980 Sep 28
1681 # From Paul Eggert (1997-08-31):
1682 # Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
1683 # Luckily, Olveston, the current de facto capital, has the same longitude.
1684 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1685 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
1690 # From Steffen Thorsen (1998-12-29):
1691 # Nicaragua seems to be back at -6:00 but I have not been able to find when
1692 # they changed from -5:00.
1694 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1695 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1696 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1697 Rule Nic 1992 only - Jan 1 4:00 1:00 D
1698 Rule Nic 1992 only - Sep 24 0:00 0 S
1699 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1700 Zone America/Managua -5:45:08 - LMT 1890
1701 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
1702 -6:00 - CST 1973 May
1703 -5:00 - EST 1975 Feb 16
1704 -6:00 Nic C%sT 1993 Jan 1 4:00
1705 -5:00 - EST 1998 Dec
1709 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1710 Zone America/Panama -5:18:08 - LMT 1890
1711 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
1715 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1716 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1717 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1718 -4:00 - AST 1942 May 3
1719 -4:00 1:00 AWT 1945 Sep 30 2:00
1723 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1724 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1728 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1729 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1730 -4:04 - CMT 1912 # Castries Mean Time
1733 # St Pierre and Miquelon
1734 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1735 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1736 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1737 -4:00 - AST 1980 May
1738 -3:00 Mont PM%sT # Pierre & Miquelon Time
1740 # St Vincent and the Grenadines
1741 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1742 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1743 -4:04:56 - KMT 1912 # Kingstown Mean Time
1747 # From Paul Eggert (1998-08-06):
1748 # Shanks says they use US DST rules, but IATA SSIM (1991/1998)
1749 # says they switch at midnight. Go with IATA SSIM.
1750 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1751 Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1752 Rule TC 1979 max - Oct lastSun 0:00 0 S
1753 Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1754 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1755 Zone America/Grand_Turk -4:44:32 - LMT 1890
1756 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1760 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1761 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1765 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1766 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
projects / apple / system_cmds.git / blob