pike.git / lib / modules / Calendar.pmod / tzdata / northamerica

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pike.git/lib/modules/Calendar.pmod/tzdata/northamerica:1: + # @(#)northamerica 7.51 + # also includes Central America and the Caribbean    -  + # This data is by no means authoritative; if you think you know better, + # go ahead and edit the file (and please send any changes to + # tz@elsie.nci.nih.gov for general use in the future). +  + # From Paul Eggert <eggert@twinsun.com> (1999-03-22): + # A reliable and entertaining source about time zones is + # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). +  + ############################################################################### +  + # United States +  + # From Paul Eggert (1999-03-31): + # Howse writes (pp 121-125) that time zones were invented by + # Professor Charles Ferdinand Dowd (1825-1904), + # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). + # His pamphlet ``A System of National Time for Railroads'' (1870) + # was the result of his proposals at the Convention of Railroad Trunk Lines + # in New York City (1869-10). His 1870 proposal was based on Washington, DC, + # but in 1872-05 he moved the proposed origin to Greenwich. + # His proposal was adopted by the railroads on 1883-11-18 at 12:00, + # and the most of the country soon followed suit. +  + # From Paul Eggert <eggert@twinsun.com> (1995-12-19): + # A good source for time zone historical data in the US is + # Thomas G. Shanks, The American Atlas (5th edition), + # San Diego: ACS Publications, Inc. (1991). + # Make sure you have the errata sheet; the book is somewhat useless without it. + # It is the source for the US and Puerto Rico entries below. +  + # From Paul Eggert (1996-06-12): + # Daylight Saving Time was first suggested as a joke by Benjamin Franklin + # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784). + # Not everyone is happy with the results: + # + # I don't really care how time is reckoned so long as there is some + # agreement about it, but I object to being told that I am saving + # daylight when my reason tells me that I am doing nothing of the kind. + # I even object to the implication that I am wasting something + # valuable if I stay in bed after the sun has risen. As an admirer + # of moonlight I resent the bossy insistence of those who want to + # reduce my time for enjoying it. At the back of the Daylight Saving + # scheme I detect the bony, blue-fingered hand of Puritanism, eager + # to push people into bed earlier, and get them up earlier, to make + # them healthy, wealthy and wise in spite of themselves. + # + # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday +  + # From Arthur David Olson: + # US Daylight Saving Time ended on the last Sunday of *October* in 1974. + # See, for example, the front page of the Saturday, 1974-10-26 + # and Sunday, 1974-10-27 editions of the Washington Post. +  + # From Arthur David Olson: + # Before the Uniform Time Act of 1966 took effect in 1967, observance of + # Daylight Saving Time in the US was by local option, except during wartime. +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War + Rule US 1918 1919 - Oct lastSun 2:00 0 S + Rule US 1942 only - Feb 9 2:00 1:00 W # War + Rule US 1945 only - Sep 30 2:00 0 S + Rule US 1967 max - Oct lastSun 2:00 0 S + Rule US 1967 1973 - Apr lastSun 2:00 1:00 D + Rule US 1974 only - Jan 6 2:00 1:00 D + Rule US 1975 only - Feb 23 2:00 1:00 D + Rule US 1976 1986 - Apr lastSun 2:00 1:00 D + Rule US 1987 max - Apr Sun>=1 2:00 1:00 D + # <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:"> + # H.R.177 + # </a> (introduced 1999-01-06) would change April to March in the above rule. +  + # From Bob Devine (1988-01-28): + # ...Alaska (and Hawaii) had the timezone names changed in 1967. + # old new + # Pacific Standard Time(PST) -same- + # Yukon Standard Time(YST) -same- + # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) + # Nome Standard Time (NT) Bering Standard Time (BST) + # + # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. + # The YST zone now covers nearly all of the state, AHST just part + # of the Aleutian islands. No DST. +  + # From Paul Eggert (1995-12-19): + # The tables below use `NST', not `NT', for Nome Standard Time. + # I invented `CAWT' for Central Alaska War Time. +  + # From U. S. Naval Observatory (1989-01-19): + # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON + # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 + # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON + # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 + # USA MOUNTAIN 7 H BEHIND UTC DENVER + # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 + # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO + # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 + # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) + # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) + # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W + # USA - " - 9 H BEHIND UTC APR 3 - OCT 30 + # USA HAWAII 10 H BEHIND UTC + # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY +  + # From Arthur David Olson (1989-01-21): + # The above dates are for 1988. + # Note the "AKST" and "AKDT" abbreviations, the claim that there's + # no DST in Samoa, and the claim that there is DST in Alaska and the + # Aleutians. +  + # From Arthur David Olson (1988-02-13): + # Legal standard time zone names, from United States Code (1982 Edition and + # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names + # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 + # took effect), as explained in sections 263 and 261: + # (none) + # United States standard eastern time + # United States standard mountain time + # United States standard central time + # United States standard Pacific time + # (none) + # United States standard Alaska time + # (none) + # Next, names from 1967-04-01 until 1983-11-30 (the date for + # public law 98-181): + # Atlantic standard time + # eastern standard time + # central standard time + # mountain standard time + # Pacific standard time + # Yukon standard time + # Alaska-Hawaii standard time + # Bering standard time + # And after 1983-11-30: + # Atlantic standard time + # eastern standard time + # central standard time + # mountain standard time + # Pacific standard time + # Alaska standard time + # Hawaii-Aleutian standard time + # Samoa standard time + # The law doesn't give abbreviations. + # + # From Paul Eggert (1995-12-19): + # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. + # Go with Shanks. +  + # US Eastern time, represented by New York + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule NYC 1920 only - Mar lastSun 2:00 1:00 D + Rule NYC 1920 only - Oct lastSun 2:00 0 S + Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D + Rule NYC 1921 1954 - Sep lastSun 2:00 0 S + Rule NYC 1955 1966 - Oct lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 +  -5:00 US E%sT 1920 +  -5:00 NYC E%sT 1942 +  -5:00 US E%sT 1946 +  -5:00 NYC E%sT 1967 +  -5:00 US E%sT +  + # US Central time, represented by Chicago + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule Chicago 1920 only - Jun 13 2:00 1:00 D + Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S + Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D + Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D + Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S + Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 +  -6:00 US C%sT 1920 +  -6:00 Chicago C%sT 1936 Mar 1 2:00 +  -5:00 - EST 1936 Nov 15 2:00 +  -6:00 Chicago C%sT 1942 +  -6:00 US C%sT 1946 +  -6:00 Chicago C%sT 1967 +  -6:00 US C%sT +  + # US Mountain time, represented by Denver + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D + Rule Denver 1920 only - Oct lastSun 2:00 0 S + Rule Denver 1921 only - May 22 2:00 0 S + Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D + Rule Denver 1965 1966 - Oct lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 +  -7:00 US M%sT 1920 +  -7:00 Denver M%sT 1942 +  -7:00 US M%sT 1946 +  -7:00 Denver M%sT 1967 +  -7:00 US M%sT +  + # US Pacific time, represented by Los Angeles + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule CA 1948 only - Mar 14 2:00 1:00 D + Rule CA 1949 only - Jan 1 2:00 0 S + Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D + Rule CA 1950 1961 - Sep lastSun 2:00 0 S + Rule CA 1962 1966 - Oct lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 +  -8:00 US P%sT 1946 +  -8:00 CA P%sT 1967 +  -8:00 US P%sT +  + # Alaska + # AK%sT is the modern abbreviation for -9:00 per USNO. + # + # From Paul Eggert (1995-12-19): + # Howse writes that Alaska switched from the Julian to the Gregorian calendar, + # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. + # This was on 1867-10-18. We omit this transition, since we can't represent + # changes from Julian to Gregorian. + # + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 +  -8:00 - PST 1942 +  -8:00 US P%sT 1946 +  -8:00 - PST 1969 +  -8:00 US P%sT 1983 Oct 30 2:00 +  -9:00 US AK%sT + Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 +  -9:00 - YST 1942 +  -9:00 US Y%sT 1946 +  -9:00 - YST 1969 +  -9:00 US Y%sT 1983 Oct 30 2:00 +  -9:00 US AK%sT + Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 +  -10:00 - CAT 1942 +  -10:00 US CAT/CAWT 1946 +  -10:00 - CAT 1967 Apr +  -10:00 - AHST 1969 +  -10:00 US AH%sT 1983 Oct 30 2:00 +  -9:00 US AK%sT + Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 +  -11:00 - NST 1942 +  -11:00 US N%sT 1946 +  -11:00 - NST 1967 Apr +  -11:00 - BST 1969 +  -11:00 US B%sT 1983 Oct 30 2:00 +  -9:00 US AK%sT + Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 +  -11:00 - NST 1942 +  -11:00 US N%sT 1946 +  -11:00 - NST 1967 Apr +  -11:00 - BST 1969 +  -11:00 US B%sT 1983 Oct 30 2:00 +  -10:00 US HA%sT + # Shanks writes that part of southwest Alaska (e.g. Aniak) + # switched from -11:00 to -10:00 on 1968-09-22 at 02:00, + # and another part (e.g. Akiak) made the same switch five weeks later. + # These switches don't quite make our 1970 cutoff. +  + # Hawaii + # + # From Arthur David Olson: + # And then there's Hawaii. + # DST was observed for one day in 1933; + # standard time was changed by half an hour in 1947; + # it's always standard as of 1986. + # + # From Paul Eggert: + # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. + # + Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 +  -10:30 - HST 1933 Apr 30 2:00 +  -10:30 1:00 HDT 1933 May 21 2:00 +  -10:30 US H%sT 1947 Jun 8 2:00 +  -10:00 - HST +  + # Now we turn to US areas that have diverged from the consensus since 1970. +  + # Arizona mostly uses MST. + Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 +  -7:00 US M%sT 1944 Jan 1 00:01 +  -7:00 - MST 1944 Mar 17 00:01 +  -7:00 US M%sT 1944 Oct 1 00:01 +  -7:00 - MST 1967 +  -7:00 US M%sT 1968 +  -7:00 - MST + # From Arthur David Olson (1988-02-13): + # A writer from the Inter Tribal Council of Arizona, Inc., + # notes in private correspondence dated 12/28/87 that "Presently, only the + # Navajo Nation participates in the Daylight Saving Time policy, due to its + # large size and location in three states." (The "only" means that other + # tribal nations don't use DST.) +  + Link America/Denver America/Shiprock +  + # Southern Idaho and eastern Oregon switched four weeks late in 1974. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 +  -8:00 US P%sT 1923 May 13 2:00 +  -7:00 US M%sT 1974 +  -7:00 - MST 1974 Feb 3 2:00 +  -7:00 US M%sT +  + # Indiana + # + # For a map of Indiana's time zone regions, see: + # <a href="http://www.mccsc.edu/time.html"> + # What time is it in Indiana? + # </a> (1999-04-06) + # + # From Paul Eggert (1995-12-19): + # Indiana generally observes either EST all year, or CST/CDT, + # but areas near Cincinnati and Louisville use those cities' timekeeping + # and in 1969 and 1970 the whole state observed daylight time; + # and there are other exceptions as noted below. + # Shanks partitions Indiana into 345 regions, each with its own time history, + # and writes ``Even newspaper reports present contradictory information.'' + # Fortunately, most of the complexity occurred before our cutoff date of 1970. + # + # Since 1970, EST-only Indiana has been like America/Indianapolis, + # with exceptions noted below for Crawford, Starke, and Switzerland counties. + # The parts of Indiana not listed below have been like America/Chicago, + # America/Louisville, or America/New_York. + # + # Other than Indianapolis, the Indiana place names are so nondescript + # that they would be ambiguous if we left them at the `America' level. + # So we reluctantly put them all in a subdirectory `America/Indiana'. + # + # Most of EST-only Indiana last observed DST in 1970. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D + Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S + Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 +  -6:00 US C%sT 1920 +  -6:00 Indianapolis C%sT 1942 +  -6:00 US C%sT 1946 +  -6:00 Indianapolis C%sT 1955 Apr 24 2:00 +  -5:00 - EST 1957 Sep 29 2:00 +  -6:00 - CST 1958 Apr 27 2:00 +  -5:00 - EST 1969 +  -5:00 US E%sT 1971 +  -5:00 - EST + Link America/Indianapolis America/Indiana/Indianapolis + # + # Part of Crawford County, Indiana, last observed DST in 1975, + # and left its clocks alone in 1974. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D + Rule Marengo 1951 only - Sep lastSun 2:00 0 S + Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D + Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 +  -6:00 US C%sT 1951 +  -6:00 Marengo C%sT 1961 Apr 30 2:00 +  -5:00 - EST 1969 +  -5:00 US E%sT 1974 Jan 6 2:00 +  -6:00 1:00 CDT 1974 Oct 27 2:00 +  -5:00 US E%sT 1976 +  -5:00 - EST + # + # Starke County, Indiana + # From Arthur David Olson (1991-10-28): + # An article on page A3 of the Sunday, 1991-10-27 Washington Post + # notes that Starke County switched from Central time to Eastern time as of + # 1991-10-27. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D + Rule Starke 1947 1954 - Sep lastSun 2:00 0 S + Rule Starke 1955 1956 - Oct lastSun 2:00 0 S + Rule Starke 1957 1958 - Sep lastSun 2:00 0 S + Rule Starke 1959 1961 - Oct lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 +  -6:00 US C%sT 1947 +  -6:00 Starke C%sT 1962 Apr 29 2:00 +  -5:00 - EST 1963 Oct 27 2:00 +  -6:00 US C%sT 1991 Oct 27 2:00 +  -5:00 - EST + # + # Switzerland County, Indiana, last observed DST in 1972. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 +  -6:00 US C%sT 1954 Apr 25 2:00 +  -5:00 - EST 1969 +  -5:00 US E%sT 1973 +  -5:00 - EST +  + # Part of Kentucky left its clocks alone in 1974. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule Louisville 1921 only - May 1 2:00 1:00 D + Rule Louisville 1921 only - Sep 1 2:00 0 S + Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D + Rule Louisville 1941 only - Sep lastSun 2:00 0 S + Rule Louisville 1946 only - Jun 2 2:00 0 S + Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S + Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 +  -6:00 US C%sT 1921 +  -6:00 Louisville C%sT 1942 +  -6:00 US C%sT 1946 +  -6:00 Louisville C%sT 1961 Jul 23 2:00 +  -5:00 - EST 1968 +  -5:00 US E%sT 1974 Jan 6 2:00 +  -6:00 1:00 CDT 1974 Oct 27 2:00 +  -5:00 US E%sT + # Wayne, Clinton, and Russell Counties, Kentucky + # From + # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=99-26945-filed"> + # Federal Register Doc. 99-26945 + # </a> (1999-10-14 08:45-04) + # In response to a petition by the Wayne County, Kentucky, Fiscal Court, + # the Department of Transportation (DOT) proposed to move Wayne County, + # Kentucky, from the Central Time Zone to the Eastern Time Zone.... Now + # the earliest date that the proposed change might take effect is + # October 29, 2000. + # + # From + # <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> + # Lake Cumberland LIFE + # </a> (1999-01-29) via WKYM-101.7: + # Clinton County has joined Wayne County in asking the DoT to change from + # the Central to the Eastern time zone.... The Wayne County government made + # the same request in December. And while Russell County officials have not + # taken action, the majority of respondents to a poll conducted there in + # August indicated they would like to change to "fast time" also. + # The three Lake Cumberland counties are the farthest east of any U.S. + # location in the Central time zone. +  + # Michigan + # + # From Bob Devine (1988-01-28): + # Michigan didn't observe DST from 1968 to 1973. + # + # From Paul Eggert (1999-03-31): + # Shanks writes that Michigan started using standard time on 1885-09-18, + # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) + # that Detroit kept + # + # local time until 1900 when the City Council decreed that clocks should + # be put back twenty-eight minutes to Central Standard Time. Half the + # city obeyed, half refused. After considerable debate, the decision + # was rescinded and the city reverted to Sun time. A derisive offer to + # erect a sundial in front of the city hall was referred to the + # Committee on Sewers. Then, in 1905, Central time was adopted + # by city vote. + # + # This story is too entertaining to be false, so go with Howse over Shanks. + # + # Most of Michigan observed DST from 1973 on, but was a bit late in 1975. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D + Rule Detroit 1948 only - Sep lastSun 2:00 0 S + Rule Detroit 1967 only - Jun 14 2:00 1:00 D + Rule Detroit 1967 only - Oct lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Detroit -5:32:11 - LMT 1905 +  -6:00 - CST 1915 May 15 2:00 +  -5:00 - EST 1942 +  -5:00 US E%sT 1946 +  -5:00 Detroit E%sT 1973 +  -5:00 US E%sT 1975 +  -5:00 - EST 1975 Apr 27 2:00 +  -5:00 US E%sT + # + # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER + Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D + Rule Menominee 1946 only - Sep lastSun 2:00 0 S + Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D + Rule Menominee 1966 only - Oct lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 +  -6:00 US C%sT 1946 +  -6:00 Menominee C%sT 1969 Apr 27 2:00 +  -5:00 - EST 1973 Apr 29 2:00 +  -6:00 US C%sT +  + # Navassa + # claimed by US under the provisions of the 1856 Guano Islands Act + # also claimed by Haiti + # occupied 1857/1900 by the Navassa Phosphate Co + # US lighthouse 1917/1997-01 + # currently uninhabited + # see Mark Fineman, ``An Isle Rich in Guano and Discord'', + # _Los Angeles Times_ (1998-11-10), A1, A10; it cites + # Jimmy Skaggs, _The Great Guano Rush_ (1994). +  + # Old names, for S5 users +  + # Link LINK-FROM LINK-TO + Link America/New_York EST5EDT + Link America/Chicago CST6CDT + Link America/Denver MST7MDT + Link America/Los_Angeles PST8PDT + Link America/Indianapolis EST + Link America/Phoenix MST + Link Pacific/Honolulu HST +  + ################################################################################ +  +  + # From Paul Eggert <eggert@twinsun.com> (1999-10-29): + # A good source for time zone historical data outside the US is + # Thomas G. Shanks, The International Atlas (5th edition), + # San Diego: ACS Publications, Inc. (1999). + # + # Gwillim Law <Gwil_Law@bridge-point.com> writes that a good source + # for recent time zone data is the International Air Transport + # Association's Standard Schedules Information Manual (IATA SSIM), + # published semiannually. Law sent in several helpful summaries + # of the IATA's data after 1990. + # + # Except where otherwise noted, Shanks is the source for entries through 1990, + # and IATA SSIM is the source for entries after 1990. + # + # Another source occasionally used is Edward W. Whitman, World Time Differences, + # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which + # I found in the UCLA library. + # + # See the `europe' file for Greenland. +  + # Canada +  + # From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): + # I post here the time zone abbreviations standardized in Canada + # for both English and French in the CAN/CSA-Z234.4-89 standard.... + # + # UTC Standard time Daylight savings time + # offset French English French English + # -2:30 - - HAT NDT + # -3 - - HAA ADT + # -3:30 HNT NST - - + # -4 HNA AST HAE EDT + # -5 HNE EST HAC CDT + # -6 HNC CST HAR MDT + # -7 HNR MST HAP PDT + # -8 HNP PST HAY YDT + # -9 HNY YST - - + # + # HN: Heure Normale ST: Standard Time + # HA: Heure Avanc<e'>e DT: Daylight saving Time + # + # A: de l'Atlantique Atlantic + # C: du Centre Central + # E: de l'Est Eastern + # M: Mountain + # N: Newfoundland + # P: du Pacifique Pacific + # R: des Rocheuses + # T: de Terre-Neuve + # Y: du Yukon Yukon + # + # From Paul Eggert <eggert@twinsun.com> (1994-11-22): + # Alas, this sort of thing must be handled by localization software. +  + # The data for Canada are all from Shanks. +  +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Canada 1918 only - Apr 14 2:00 1:00 D + Rule Canada 1918 only - Oct 31 2:00 0 S + Rule Canada 1942 only - Feb 9 2:00 1:00 D + Rule Canada 1945 only - Sep 30 2:00 0 S + Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D + Rule Canada 1974 max - Oct lastSun 2:00 0 S + Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D +  +  + # Newfoundland (except Labrador) +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D + Rule StJohns 1917 only - Sep 17 2:00 0 S + Rule StJohns 1918 only - Oct 31 2:00 0 S + # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. + Rule StJohns 1919 only - May 5 23:00 1:00 D + Rule StJohns 1919 only - Aug 12 23:00 0 S + # For 1931-1935 Whitman gives Apr same date; go with Shanks. + Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D + Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S + # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. + Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D + Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S + # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. + Rule StJohns 1942 only - Mar 1 0:00 1:00 D + Rule StJohns 1942 only - Dec 31 0:00 0 S + Rule StJohns 1943 only - May 30 0:00 1:00 D + Rule StJohns 1943 only - Sep 5 0:00 0 S + Rule StJohns 1944 only - Jul 10 0:00 1:00 D + Rule StJohns 1944 only - Sep 2 0:00 0 S + Rule StJohns 1945 only - Jan 1 0:00 1:00 D + Rule StJohns 1945 only - Oct 7 2:00 0 S + # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives + # Apr 30 - Sep 24; go with Shanks. + Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D + Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S + Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D + Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S + Rule StJohns 1960 max - Oct lastSun 2:00 0 S + Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D + Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD + Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D + # St John's has an apostrophe, but Posix file names can't have apostrophes. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/St_Johns -3:30:52 - LMT 1884 +  -3:30:52 StJohns N%sT 1935 Mar 30 +  -3:30 StJohns N%sT +  +  + # east Labrador +  + # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay +  -3:30:52 StJohns NST 1919 +  -3:30:52 - NST 1935 Mar 30 +  -3:30 - NST 1936 +  -3:30 StJohns N%sT 1966 Mar 15 2:00 +  -4:00 StJohns A%sT +  +  + # west Labrador, New Brunswick, Nova Scotia, Prince Edward I +  + # From Paul Eggert (1996-06-12): + # Shanks writes that since 1970 most of this region has been like Halifax. + # Many locales did not observe peacetime DST until 1972; + # Glace Bay, NS is the largest that we know of. + # Shanks also writes that Liverpool, NS was the only town in Canada to observe + # DST in 1971 but not 1970; for now we'll assume this is a typo. +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Halifax 1916 only - Apr 1 0:00 1:00 D + Rule Halifax 1916 only - Oct 1 0:00 0 S + Rule Halifax 1918 only - Apr 14 2:00 1:00 D + Rule Halifax 1918 only - Oct 31 2:00 0 S + Rule Halifax 1920 only - May 9 0:00 1:00 D + Rule Halifax 1920 only - Aug 29 0:00 0 S + Rule Halifax 1921 only - May 6 0:00 1:00 D + Rule Halifax 1921 1922 - Sep 5 0:00 0 S + Rule Halifax 1922 only - Apr 30 0:00 1:00 D + Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D + Rule Halifax 1923 only - Sep 4 0:00 0 S + Rule Halifax 1924 only - Sep 15 0:00 0 S + Rule Halifax 1925 only - Sep 28 0:00 0 S + Rule Halifax 1926 only - May 16 0:00 1:00 D + Rule Halifax 1926 only - Sep 13 0:00 0 S + Rule Halifax 1927 only - May 1 0:00 1:00 D + Rule Halifax 1927 only - Sep 26 0:00 0 S + Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D + Rule Halifax 1928 only - Sep 9 0:00 0 S + Rule Halifax 1929 only - Sep 3 0:00 0 S + Rule Halifax 1930 only - Sep 15 0:00 0 S + Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S + Rule Halifax 1933 only - Apr 30 0:00 1:00 D + Rule Halifax 1933 only - Oct 2 0:00 0 S + Rule Halifax 1934 only - May 20 0:00 1:00 D + Rule Halifax 1934 only - Sep 16 0:00 0 S + Rule Halifax 1935 only - Jun 2 0:00 1:00 D + Rule Halifax 1935 only - Sep 30 0:00 0 S + Rule Halifax 1936 only - Jun 1 0:00 1:00 D + Rule Halifax 1936 only - Sep 14 0:00 0 S + Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D + Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S + Rule Halifax 1939 only - May 28 0:00 1:00 D + Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D + Rule Halifax 1942 only - Feb 9 2:00 1:00 D + Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S + Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D + Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D + Rule Halifax 1962 max - Oct lastSun 2:00 0 S + Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 +  -4:00 Halifax A%sT + Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 +  -4:00 Canada A%sT 1953 +  -4:00 Halifax A%sT 1954 +  -4:00 - AST 1972 +  -4:00 Halifax A%sT +  +  + # Ontario, Quebec +  + # From Paul Eggert (1996-06-12): + # Shanks writes that since 1970 most of this region has been like Montreal. + # Thunder Bay skipped DST in 1973. + # Many smaller locales did not observe peacetime DST until 1974; + # Nipigon (EST) and Rainy River (CST) are the largest that we know of. + # Far west Ontario is like Winnipeg; far east Quebec is like Halifax. +  + # From Paul Eggert (1997-10-17): + # msb@sq.com writes that an article in the 1997-10-14 Toronto Star + # says that Atikokan, Ontario currently does not observe DST, + # but will vote on 11-10 whether to use EST/EDT. + # He also writes that the + # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> + # Ontario Time Act (1990, Chapter T.9) + # </a> + # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. + # Officially Atikokan is therefore on CST/CDT, and most likely this report + # concerns a non-official time observed as a matter of local practice. + # For what it's worth, Shanks says that Atikokan has agreed with + # Rainy River ever since standard time was introduced. +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Mont 1917 only - Mar 25 2:00 1:00 D + Rule Mont 1917 only - Apr 24 0:00 0 S + Rule Mont 1918 only - Apr 14 2:00 1:00 D + Rule Mont 1918 only - Oct 31 2:00 0 S + Rule Mont 1919 only - Mar 31 2:30 1:00 D + Rule Mont 1919 only - Oct 25 2:30 0 S + Rule Mont 1920 only - May 2 2:30 1:00 D + Rule Mont 1920 only - Oct 3 2:30 0 S + Rule Mont 1921 only - May 1 2:00 1:00 D + Rule Mont 1921 only - Oct 2 2:30 0 S + Rule Mont 1922 only - Apr 30 2:00 1:00 D + Rule Mont 1922 only - Oct 1 2:30 0 S + Rule Mont 1924 only - May 17 2:00 1:00 D + Rule Mont 1924 1926 - Sep lastSun 2:30 0 S + Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D + Rule Mont 1927 only - May 1 0:00 1:00 D + Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S + Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D + Rule Mont 1932 only - May 1 0:00 1:00 D + Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D + Rule Mont 1933 only - Oct 1 0:00 0 S + Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S + Rule Mont 1945 1948 - Sep lastSun 2:00 0 S + Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D + Rule Mont 1949 1950 - Oct lastSun 2:00 0 S + Rule Mont 1951 1956 - Sep lastSun 2:00 0 S + Rule Mont 1957 max - Oct lastSun 2:00 0 S + Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Montreal -4:54:16 - LMT 1884 +  -5:00 Mont E%sT + Zone America/Thunder_Bay -5:57:00 - LMT 1895 +  -5:00 Canada E%sT 1970 +  -5:00 Mont E%sT 1973 +  -5:00 - EST 1974 +  -5:00 Canada E%sT + Zone America/Nipigon -5:53:04 - LMT 1895 +  -5:00 Canada E%sT + Zone America/Rainy_River -6:17:56 - LMT 1895 +  -6:00 Canada C%sT +  +  + # Manitoba +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Winn 1916 only - Apr 23 0:00 1:00 D + Rule Winn 1916 only - Sep 17 0:00 0 S + Rule Winn 1918 only - Apr 14 2:00 1:00 D + Rule Winn 1918 only - Oct 31 2:00 0 S + Rule Winn 1937 only - May 16 2:00 1:00 D + Rule Winn 1937 only - Sep 26 2:00 0 S + Rule Winn 1942 only - Feb 9 2:00 1:00 D + Rule Winn 1945 only - Sep lastSun 2:00 0 S + Rule Winn 1946 only - May 12 2:00 1:00 D + Rule Winn 1946 only - Oct 13 2:00 0 S + Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D + Rule Winn 1947 1949 - Sep lastSun 2:00 0 S + Rule Winn 1950 only - May 1 2:00 1:00 D + Rule Winn 1950 only - Sep 30 2:00 0 S + Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D + Rule Winn 1951 1958 - Sep lastSun 2:00 0 S + Rule Winn 1959 only - Oct lastSun 2:00 0 S + Rule Winn 1960 only - Sep lastSun 2:00 0 S + Rule Winn 1963 only - Apr lastSun 2:00 1:00 D + Rule Winn 1963 only - Sep 22 2:00 0 S + Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D + Rule Winn 1966 max - Oct lastSun 2:00 0 S + Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 +  -6:00 Winn C%sT +  +  + # Saskatchewan +  + # From Paul Eggert (1996-06-12): + # Shanks writes that since 1970 most of this region has been like Regina. + # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. + # Other western towns (e.g. Lloydminster) are like Edmonton. +  + # From W. Jones <jones@skdad.usask.ca> (1992-11-06): + # The. . .below is based on information I got from our law library, the + # provincial archives, and the provincial Community Services department. + # A precise history would require digging through newspaper archives, and + # since you didn't say what you wanted, I didn't bother. + # + # Saskatchewan is split by a time zone meridian (105W) and over the years + # the boundary became pretty ragged as communities near it reevaluated + # their affiliations in one direction or the other. In 1965 a provincial + # referendum favoured legislating common time practices. + # + # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of + # Saskatchewan 1978) was proclaimed, and established that the eastern + # part of Saskatchewan would use CST year round, that districts in + # northwest Saskatchewan would by default follow CST but could opt to + # follow Mountain Time rules (thus 1 hour difference in the winter and + # zero in the summer), and that districts in southwest Saskatchewan would + # by default follow MT but could opt to follow CST. + # + # It took a few years for the dust to settle (I know one story of a town + # on one time zone having its school in another, such that a mom had to + # serve her family lunch in two shifts), but presently it seems that only + # a few towns on the border with Alberta (e.g. Lloydminster) follow MT + # rules any more; all other districts appear to have used CST year round + # since sometime in the 1960s. +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Regina 1918 only - Apr 14 2:00 1:00 D + Rule Regina 1918 only - Oct 31 2:00 0 S + Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D + Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S + Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D + Rule Regina 1937 only - Oct Sun>=8 0:00 0 S + Rule Regina 1938 only - Oct Sun>=1 0:00 0 S + Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S + Rule Regina 1942 only - Feb 9 2:00 1:00 D + Rule Regina 1945 only - Sep lastSun 2:00 0 S + Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D + Rule Regina 1946 only - Oct Sun>=8 2:00 0 S + Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D + Rule Regina 1947 1958 - Sep lastSun 2:00 0 S + Rule Regina 1959 only - Oct lastSun 2:00 0 S + # + Rule Swift 1957 only - Apr lastSun 2:00 1:00 D + Rule Swift 1957 only - Oct lastSun 2:00 0 S + Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D + Rule Swift 1959 only - Oct lastSun 2:00 0 S + Rule Swift 1960 1961 - Sep lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Regina -6:58:36 - LMT 1905 Sep +  -7:00 Regina M%sT 1960 Apr lastSun 2:00 +  -6:00 - CST + Zone America/Swift_Current -7:11:20 - LMT 1905 Sep +  -7:00 Canada M%sT 1946 Apr lastSun 2:00 +  -7:00 Regina M%sT 1950 +  -7:00 Swift M%sT 1972 Apr lastSun 2:00 +  -6:00 - CST +  +  + # Alberta +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D + Rule Edm 1918 only - Oct 31 2:00 0 S + Rule Edm 1919 only - May 27 2:00 0 S + Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D + Rule Edm 1920 only - Oct lastSun 2:00 0 S + Rule Edm 1921 1923 - Sep lastSun 2:00 0 S + Rule Edm 1942 only - Feb 9 2:00 1:00 D + Rule Edm 1945 only - Sep lastSun 2:00 0 S + Rule Edm 1947 only - Apr lastSun 2:00 1:00 D + Rule Edm 1947 only - Sep lastSun 2:00 0 S + Rule Edm 1967 only - Apr lastSun 2:00 1:00 D + Rule Edm 1967 only - Oct lastSun 2:00 0 S + Rule Edm 1969 only - Apr lastSun 2:00 1:00 D + Rule Edm 1969 only - Oct lastSun 2:00 0 S + Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D + Rule Edm 1972 max - Oct lastSun 2:00 0 S + Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Edmonton -7:33:52 - LMT 1906 Sep +  -7:00 Edm M%sT +  +  + # British Columbia +  + # From Paul Eggert (1996-06-12): + # Shanks writes that since 1970 most of this region has been like Vancouver. + # Dawson Creek uses MST. Much of east BC is like Edmonton. +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Vanc 1918 only - Apr 14 2:00 1:00 D + Rule Vanc 1918 only - Oct 31 2:00 0 S + Rule Vanc 1942 only - Feb 9 2:00 1:00 D + Rule Vanc 1945 only - Sep 30 2:00 0 S + Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D + Rule Vanc 1946 only - Oct 13 2:00 0 S + Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S + Rule Vanc 1962 max - Oct lastSun 2:00 0 S + Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Vancouver -8:12:28 - LMT 1884 +  -8:00 Vanc P%sT + Zone America/Dawson_Creek -8:00:56 - LMT 1884 +  -8:00 Canada P%sT 1947 +  -8:00 Vanc P%sT 1972 Aug 30 2:00 +  -7:00 - MST +  +  + # Northwest Territories, Nunavut, Yukon +  + # From Paul Eggert (1999-10-29): + # Dawson switched to PST in 1973. Inuvik switched to MST in 1979. + # Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: + # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, + # c. 7 defines Yukon standard time as UTC-9. This is still valid; + # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). + # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. + # * O.I.C. 1980/02 established DST. + # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. + # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. +  + # From Rives McDow (1999-09-04): + # Nunavut ... moved ... to incorporate the whole territory into one time zone. + # <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> + # Nunavut moves to single time zone Oct. 31 + # </a> + # + # From Antoine Leca (1999-09-06): + # We then need to create a new timezone for the Kitikmeot region of Nunavut + # to differentiate it from the Yellowknife region. +  + # From Paul Eggert (1999-09-20): + # <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> + # Basic Facts: The New Territory + # </a> (1999) reports that Pangnirtung operates on Eastern time, + # and that Coral Harbour does not observe DST. We don't know when + # Pangnirtung switched to Eastern time; we'll guess 1995. + # We'll ignore the claim about Coral Harbour for now, + # since we have no further info. +  + # From Rives McDow (1999-11-08): + # On October 31, when the rest of Nunavut went to Central time, + # Pangnirtung wobbled. Here is the result of their wobble: + # + # The following businesses and organizations in Pangnirtung use Central Time: + # + # First Air, Power Corp, Nunavut Construction, Health Center, RCMP, + # Eastern Arctic National Parks, A & D Specialist + # + # The following businesses and organizations in Pangnirtung use Eastern Time: + # + # Hamlet office, All other businesses, Both schools, Airport operator + # + # This has made for an interesting situation there, which warranted the news. + # No one there that I spoke with seems concerned, or has plans to + # change the local methods of keeping time, as it evidently does not + # really interfere with any activities or make things difficult locally. + # They plan to celebrate New Year's turn-over twice, one hour apart, + # so it appears that the situation will last at least that long. + # The Nunavut Intergovernmental Affairs hopes that they will "come to + # their senses", but the locals evidently don't see any problem with + # the current state of affairs. +  + # From Michaela Rodrigue, writing in the + # <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> + # Nunatsiaq News (1999-11-19)</a>: + # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, + # central - or Nunavut time - for government offices, and eastern time + # for municipal offices and schools.... Igloolik [was similar but then] + # made the switch to central time on Saturday, Nov. 6. +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule NT_YK 1918 only - Apr 14 2:00 1:00 D + Rule NT_YK 1918 only - Oct 27 2:00 0 S + Rule NT_YK 1919 only - May 25 2:00 1:00 D + Rule NT_YK 1919 only - Nov 1 0:00 0 S + Rule NT_YK 1942 only - Feb 9 2:00 1:00 D + Rule NT_YK 1945 only - Sep 30 2:00 0 S + Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD + Rule NT_YK 1965 only - Oct lastSun 2:00 0 S + Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D + Rule NT_YK 1980 max - Oct lastSun 2:00 0 S + Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Pangnirtung -4:22:56 - LMT 1884 +  -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 +  -5:00 Canada E%sT 1999 Oct 31 2:00 +  -6:00 Canada C%sT + Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 +  -5:00 NT_YK E%sT 1999 Oct 31 2:00 +  -6:00 Canada C%sT + Zone America/Rankin_Inlet -6:08:40 - LMT 1884 +  -6:00 NT_YK C%sT + Zone America/Cambridge_Bay -7:00:20 - LMT 1884 +  -7:00 NT_YK M%sT 1999 Oct 31 2:00 +  -6:00 Canada C%sT + Zone America/Yellowknife -7:37:24 - LMT 1884 +  -7:00 NT_YK M%sT + Zone America/Inuvik -8:54:00 - LMT 1884 +  -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 +  -7:00 NT_YK M%sT + Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 +  -9:00 NT_YK Y%sT 1966 Jul 1 2:00 +  -8:00 NT_YK P%sT + Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 +  -9:00 NT_YK Y%sT 1973 Oct 28 0:00 +  -8:00 NT_YK P%sT +  +  + ############################################################################### +  + # Mexico +  + # From Guy Harris: + # Rules are from the Official Airline Guide, Worldwide Edition, for 1987. + # Rules [before] 1987 are unknown. + # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana + # observe DST." This is presumably Baja California Norte, above 28th parallel, + # as listed there; [there is also] "Baja California Sur and N. Pacific + # Coast (States of Sinaloa and Sonora)." +  + # From Bob Devine (1988-01-28): + # The Federal District (where Mexico City is) has observed [DST] several + # times but not recently. + # + # I don't where to draw the line in the North Baja area. 28th latitude + # sounds good -- but it may be higher (how far [d]o radio stations from + # San Diego affect culture?). + # + # The dates of DST probably go back to 1981. The rules are the same as + # US's. This is going to be a headache for US presidential electi[o]n years! +  + # From Arthur David Olson (1988-02-13) + # Since the 1981 starting date is only "probable," we'll keep the 1987 + # starting date below. +  + # From U. S. Naval Observatory (1989-01-19): + # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND + # MEXICO BAJA CAL N N. PACIFIC COAST (STATES + # MEXICO BAJA CAL N OF SINALOA AND SONORA) + # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 + # MEXICO BAJA CAL N - OCT 29 + # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 + # MEXICO BAJA CAL N - 0CT 29 + # MEXICO 6 H BEHIND UTC STATES OF DURANGO, + # MEXICO COAHUILA, NUEVO LEON, + # MEXICO TAMAULIPAS + # MEXICO 5 H BEHIND UTC STATES OF DURANGO, + # MEXICO COAHUILA, NUEVO LEON, + # MEXICO TAMAULIPAS APR 3 - OCT 29 + # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF + # MEXICO CAMPECHE, QUINTANA ROO AND + # MEXICO YUCATAN +  + # From Arthur David Olson (1989-01-21): + # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. + # USNO claims there should be four Mexican zones rather than three: + # a zone that's GMT-8 with DST; a zone that's always GMT-7; + # a zone that's GMT-6 with DST; and a zone that's always GMT-6. +  + # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): + # A guy from our Mexico subsidiary finally found the Presidential Decree + # outlining the timezone changes in Mexico. + # + # ------------- Begin Forwarded Message ------------- + # + # I finally got my hands on the Official Presidential Decree that sets up the + # rules for the DST changes. The rules are: + # + # 1. The country is divided in 3 timezones: + # - Baja California Norte (the Mexico/BajaNorte TZ) + # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) + # - The rest of the country (the Mexico/General TZ) + # + # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October + # at 2:00 AM, the times in each zone are as follows: + # BajaNorte: GMT+7 + # BajaSur: GMT+6 + # General: GMT+5 + # + # 3. The rest of the year, the times are as follows: + # BajaNorte: GMT+8 + # BajaSur: GMT+7 + # General: GMT+6 + # + # The Decree was published in Mexico's Official Newspaper on January 4th. + # + # -------------- End Forwarded Message -------------- + # From Paul Eggert (1996-06-12): + # For an English translation of the decree, see + # <a href="http://mexico-travel.com/extra/timezone_eng.html"> + # ``Diario Oficial: Time Zone Changeover'' (1996-01-04). + # </a> +  + # From Rives McDow (1998-10-08): + # The State of Quintana Roo has reverted back to central STD and DST times + # (i.e. UTC -0600 and -0500 as of 1998-08-02). +  + # From Rives McDow (2000-01-10): + # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time + # zone 5 hours from the International Date Line, and will not observe daylight + # savings time so as to stay on the same time zone as the southern part of + # Arizona year round. +  + # From Shanks: + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Mexico 1939 only - Feb 5 0:00 1:00 D + Rule Mexico 1939 only - Jun 25 0:00 0 S + Rule Mexico 1940 only - Dec 9 0:00 1:00 D + Rule Mexico 1941 only - Apr 1 0:00 0 S + Rule Mexico 1943 only - Dec 16 0:00 1:00 D + Rule Mexico 1944 only - May 1 0:00 0 S + Rule Mexico 1950 only - Feb 12 0:00 1:00 D + Rule Mexico 1950 only - Jul 30 0:00 0 S + Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D + Rule Mexico 1996 max - Oct lastSun 2:00 0 S + # + Rule BajaN 1954 1961 - Apr lastSun 2:00 1:00 D + Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + # Quintana Roo + Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 +  -6:00 - CST 1996 +  -6:00 Mexico C%sT 1997 Oct lastSun 2:00 +  -5:00 Mexico E%sT 1998 Aug 2 2:00 +  -6:00 Mexico C%sT + # Central Mexico + Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 +  -7:00 - MST 1927 Jun 10 23:00 +  -6:00 - CST 1930 Nov 15 +  -7:00 - MST 1931 May 1 23:00 +  -6:00 - CST 1931 Oct +  -7:00 - MST 1932 Mar 30 23:00 +  -6:00 Mexico C%sT + # Chihuahua + Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 +  -7:00 - MST 1927 Jun 10 23:00 +  -6:00 - CST 1930 Nov 15 +  -7:00 - MST 1931 May 1 23:00 +  -6:00 - CST 1931 Oct +  -7:00 - MST 1932 Mar 30 23:00 +  -6:00 - CST 1996 +  -6:00 Mexico C%sT 1998 +  -6:00 - CST 1998 Apr Sun>=1 3:00 +  -7:00 Mexico M%sT + # Sonora + Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 +  -7:00 - MST 1927 Jun 10 23:00 +  -6:00 - CST 1930 Nov 15 +  -7:00 - MST 1931 May 1 23:00 +  -6:00 - CST 1931 Oct +  -7:00 - MST 1932 Mar 30 23:00 +  -6:00 - CST 1942 Apr +  -7:00 - MST 1949 Jan 14 +  -8:00 - PST 1970 +  -7:00 Mexico M%sT 1999 +  -7:00 - MST + # S Baja California, Nayarit, Sinaloa + Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 +  -7:00 - MST 1927 Jun 10 23:00 +  -6:00 - CST 1930 Nov 15 +  -7:00 - MST 1931 May 1 23:00 +  -6:00 - CST 1931 Oct +  -7:00 - MST 1932 Mar 30 23:00 +  -6:00 - CST 1942 Apr +  -7:00 - MST 1949 Jan 14 +  -8:00 - PST 1970 +  -7:00 Mexico M%sT + # Baja California + Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 +  -8:00 - PST 1927 Jun 10 23:00 +  -7:00 - MST 1930 Nov 16 +  -8:00 - PST 1942 Apr +  -7:00 - MST 1949 Jan 14 +  -8:00 BajaN P%sT 1976 +  -8:00 US P%sT 1996 +  -8:00 Mexico P%sT + # + # Revillagigedo Is + # no information +  + ############################################################################### +  + # Anguilla + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 +  -4:00 - AST +  + # Antigua and Barbuda + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 +  -5:00 - EST 1951 +  -4:00 - AST +  + # Bahamas + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Bahamas 1964 max - Oct lastSun 2:00 0 S + Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D + Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 +  -5:00 Bahamas E%sT +  + # Barbados + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Barb 1977 only - Jun 12 2:00 1:00 D + Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S + Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D + Rule Barb 1979 only - Sep 30 2:00 0 S + Rule Barb 1980 only - Sep 25 2:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown +  -3:58:28 - BMT 1932 # Bridgetown Mean Time +  -4:00 Barb A%sT +  + # Belize + # Whitman entirely disagrees with Shanks; go with Shanks. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD + Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S + Rule Belize 1973 only - Dec 5 0:00 1:00 D + Rule Belize 1974 only - Feb 9 0:00 0 S + Rule Belize 1982 only - Dec 18 0:00 1:00 D + Rule Belize 1983 only - Feb 12 0:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Belize -5:52:48 - LMT 1912 Apr +  -6:00 Belize C%sT +  + # Bermuda + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton +  -4:00 - AST 1974 Apr 28 2:00 +  -4:00 Bahamas A%sT +  + # Cayman Is + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown +  -5:07:12 - KMT 1912 Feb # Kingston Mean Time +  -5:00 - EST +  + # Costa Rica + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D + Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S + Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D + # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. + Rule CR 1991 only - Jul 1 0:00 0 S + Rule CR 1992 only - Mar 15 0:00 0 S + # There are too many San Joses elsewhere, so we'll use `Costa Rica'. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose +  -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time +  -6:00 CR C%sT + # Coco + # no information; probably like America/Costa_Rica +  + # Cuba +  + # From Arthur David Olson (1999-03-29): + # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between + # the Cuban National Team and the Baltimore Orioles was carried live on + # the Orioles Radio Network, including affiliate WTOP in Washington, DC. + # During the game, play-by-play announcer Jim Hunter noted that + # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving + # Time today." (The "two hour" remark referred to losing one hour of + # sleep on 1999-03-28--when the announcers were in Cuba as it switched + # to DST--and one more hour on 1999-04-04--when the announcers will have + # returned to Baltimore, which switches on that date.) +  + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Cuba 1928 only - Jun 10 0:00 1:00 D + Rule Cuba 1928 only - Oct 10 0:00 0 S + Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D + Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S + Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D + Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S + Rule Cuba 1965 only - Jun 1 0:00 1:00 D + Rule Cuba 1965 only - Sep 30 0:00 0 S + Rule Cuba 1966 only - May 29 0:00 1:00 D + Rule Cuba 1966 only - Oct 2 0:00 0 S + Rule Cuba 1967 only - Apr 8 0:00 1:00 D + Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S + Rule Cuba 1968 only - Apr 14 0:00 1:00 D + Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D + Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S + Rule Cuba 1972 1974 - Oct 8 0:00 0 S + Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S + Rule Cuba 1978 only - May 7 0:00 1:00 D + Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S + Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D + Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D + Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D + Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D + Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S + Rule Cuba 1996 only - Oct 6 0:00s 0 S + Rule Cuba 1997 only - Oct 12 0:00s 0 S + Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D + Rule Cuba 1998 max - Oct lastSun 0:00s 0 S + Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D +  + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Havana -5:29:28 - LMT 1890 +  -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT +  -5:00 Cuba C%sT +  + # Dominica + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau +  -4:00 - AST +  + # Dominican Republic + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule DR 1966 only - Oct 30 0:00 1:00 D + Rule DR 1967 only - Feb 28 0:00 0 S + Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD + Rule DR 1970 only - Feb 21 0:00 0 S + Rule DR 1971 only - Jan 20 0:00 0 S + Rule DR 1972 1974 - Jan 21 0:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Santo_Domingo -4:39:36 - LMT 1890 +  -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT +  -5:00 DR E%sT 1974 Oct 27 +  -4:00 - AST +  + # El Salvador + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D + Rule Salv 1987 1988 - Sep lastSun 0:00 0 S + # There are too many San Salvadors elsewhere, so we'll use `El Salvador'. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador +  -6:00 Salv C%sT +  + # Grenada + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's +  -4:00 - AST +  + # Guadeloupe + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre +  -4:00 - AST +  + # Guatemala + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Guat 1973 only - Nov 25 0:00 1:00 D + Rule Guat 1974 only - Feb 24 0:00 0 S + Rule Guat 1983 only - May 21 0:00 1:00 D + Rule Guat 1983 only - Sep 22 0:00 0 S + Rule Guat 1991 only - Mar 23 0:00 1:00 D + Rule Guat 1991 only - Sep 7 0:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 +  -6:00 Guat C%sT +  + # Haiti + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Haiti 1983 only - May 8 0:00 1:00 D + Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D + Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S + # Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. + Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D + Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Port-au-Prince -4:49:20 - LMT 1890 +  -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT +  -5:00 Haiti E%sT +  + # Honduras + # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr +  -6:00 Salv C%sT + # + # Great Swan I ceded by US to Honduras in 1972 +  + # Jamaica +  + # From Bob Devine (1988-01-28): + # Follows US rules. +  + # From U. S. Naval Observatory (1989-01-19): + # JAMAICA 5 H BEHIND UTC +  + # From Shanks: + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston +  -5:07:12 - KMT 1912 Feb # Kingston Mean Time +  -5:00 - EST 1974 Apr 28 2:00 +  -5:00 US E%sT 1984 +  -5:00 - EST +  + # Martinique + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France +  -4:04 - FFMT 1911 May # Fort-de-France MT +  -4:00 - AST 1980 Apr 6 +  -4:00 1:00 ADT 1980 Sep 28 +  -4:00 - AST +  + # Montserrat + # From Paul Eggert (1997-08-31): + # Recent volcanic eruptions have forced evacuation of Plymouth, the capital. + # Luckily, Olveston, the current de facto capital, has the same longitude. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston +  -4:00 - AST +  + # Nicaragua + # + # From Steffen Thorsen (1998-12-29): + # Nicaragua seems to be back at -6:00 but I have not been able to find when + # they changed from -5:00. + # + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D + Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S + Rule Nic 1992 only - Jan 1 4:00 1:00 D + Rule Nic 1992 only - Sep 24 0:00 0 S + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Managua -5:45:08 - LMT 1890 +  -5:45 - MMT 1934 Jun 23 # Managua Mean Time +  -6:00 - CST 1973 May +  -5:00 - EST 1975 Feb 16 +  -6:00 Nic C%sT 1993 Jan 1 4:00 +  -5:00 - EST 1998 Dec +  -6:00 - CST +  + # Panama + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Panama -5:18:08 - LMT 1890 +  -5:20 - PMT 1908 Apr 22 # Panama Mean Time +  -5:00 - EST +  + # Puerto Rico + # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan +  -4:00 - AST 1942 May 3 +  -4:00 1:00 AWT 1945 Sep 30 2:00 +  -4:00 - AST +  + # St Kitts-Nevis + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre +  -4:00 - AST +  + # St Lucia + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries +  -4:04 - CMT 1912 # Castries Mean Time +  -4:00 - AST +  + # St Pierre and Miquelon + # There are too many St Pierres elsewhere, so we'll use `Miquelon'. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre +  -4:00 - AST 1980 May +  -3:00 Mont PM%sT # Pierre & Miquelon Time +  + # St Vincent and the Grenadines + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown +  -4:04:56 - KMT 1912 # Kingstown Mean Time +  -4:00 - AST +  + # Turks and Caicos + # From Paul Eggert (1998-08-06): + # Shanks says they use US DST rules, but IATA SSIM (1991/1998) + # says they switch at midnight. Go with IATA SSIM. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S + Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D + Rule TC 1979 max - Oct lastSun 0:00 0 S + Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Grand_Turk -4:44:32 - LMT 1890 +  -5:07:12 - KMT 1912 Feb # Kingston Mean Time +  -5:00 TC E%sT +  + # British Virgin Is + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town +  -4:00 - AST +  + # Virgin Is + # Zone NAME GMTOFF RULES FORMAT [UNTIL] + Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie +  -4:00 - AST   Newline at end of file added.