2440ca2003-03-30Mirar (Pontus Hagland) # @(#)northamerica 7.62
c0dbee2000-08-01Mirar (Pontus Hagland) # 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.
2440ca2003-03-30Mirar (Pontus Hagland) # From Paul Eggert (2001-03-06):
c0dbee2000-08-01Mirar (Pontus Hagland) # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
2440ca2003-03-30Mirar (Pontus Hagland) # in his whimsical essay ``An Economical Project for Diminishing the Cost # of Light'' published in the Journal de Paris (1784-04-26).
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland) # # For more about the first ten years of DST in the United States, see # Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> # Ten years of daylight saving from the Pittsburgh standpoint # (Carnegie Library of Pittsburgh, 1927)</a>. # # Shanks says that DST was called "War Time" in the US in 1918 and 1919. # However, DST was imposed by the Standard Time Act of 1918, which # was the first nationwide legal time standard, and apparently # time was just called "Standard Time" or "Daylight Saving Time".
c0dbee2000-08-01Mirar (Pontus Hagland)  # 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.
059cb82000-11-15Mirar (Pontus Hagland) # From Arthur David Olson (2000-09-25): # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. # In the introduction, Oboler spoke of "Eastern Peace Time." # An AltaVista search turned up # <a href="http://rowayton.org/rhs/hstaug45.html">: # "When the time is announced over the radio now, it is 'Eastern Peace # Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." # </a> (August 1945) by way of confirmation. # From Joseph Gallant <notquite@hotmail.com>, citing # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
2440ca2003-03-30Mirar (Pontus Hagland) # to switch to London for Attlee's address, but the American people
059cb82000-11-15Mirar (Pontus Hagland) # never got to hear his speech live. According to one press account, # CBS' Bob Trout was first to announce the word of Japan's surrender, # but a few seconds later, NBC, ABC and Mutual also flashed the word # of surrender, all of whom interrupting the bells of Big Ben in
2440ca2003-03-30Mirar (Pontus Hagland) # London which were to precede Mr. Attlee's speech.
059cb82000-11-15Mirar (Pontus Hagland) 
2440ca2003-03-30Mirar (Pontus Hagland) # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: # # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. # Any announcement from Asia would reach St. John's New York newsroom on a # wire service teletype machine, which had prescribed signals for major news. # Associated Press, for example, would ring five bells before spewing out # typed copy of an important story, and 10 bells for news "of transcendental # importance." # # On Aug. 14, stalling while talking steadily into the NBC networks' open # microphone, St. John heard five bells and waited only to hear a sixth bell, # before announcing confidently: "Ladies and gentlemen, World War II is over. # The Japanese have agreed to our surrender terms." # # He had scored a 20-second scoop on other broadcasters.
059cb82000-11-15Mirar (Pontus Hagland) 
c0dbee2000-08-01Mirar (Pontus Hagland) # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2440ca2003-03-30Mirar (Pontus Hagland) Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
c0dbee2000-08-01Mirar (Pontus Hagland) Rule US 1918 1919 - Oct lastSun 2:00 0 S Rule US 1942 only - Feb 9 2:00 1:00 W # War
059cb82000-11-15Mirar (Pontus Hagland) Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
c0dbee2000-08-01Mirar (Pontus Hagland) 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.
2440ca2003-03-30Mirar (Pontus Hagland) # # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: # Public law 106-564 (2000-12-23) introduced the abbreviation # "Chamorro Standard Time" for time in Guam and the Northern Marianas. # See the file "australasia".
c0dbee2000-08-01Mirar (Pontus Hagland) 
2440ca2003-03-30Mirar (Pontus Hagland) # US eastern time, represented by New York
059cb82000-11-15Mirar (Pontus Hagland)  # Connecticut, Delaware, District of Columbia, most of Florida,
2440ca2003-03-30Mirar (Pontus Hagland) # Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and # Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts, # New Hampshire, New Jersey, New York, North Carolina, Ohio, # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, # Vermont, Virginia, West Virginia
059cb82000-11-15Mirar (Pontus Hagland) 
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland) # US central time, represented by Chicago
059cb82000-11-15Mirar (Pontus Hagland)  # Alabama, Arkansas, Florida panhandle, Illinois, western Indiana
2440ca2003-03-30Mirar (Pontus Hagland) # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, # western Tennessee, most of Texas, Wisconsin
059cb82000-11-15Mirar (Pontus Hagland) 
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland) # Oliver County, ND switched from mountain to central time on 1992-10-25. Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:00 -7:00 US M%sT 1992 Oct 25 02:00 -6:00 US C%sT
c0dbee2000-08-01Mirar (Pontus Hagland) 
2440ca2003-03-30Mirar (Pontus Hagland) # US mountain time, represented by Denver
059cb82000-11-15Mirar (Pontus Hagland) # # Colorado, southern Idaho, far western Kansas, Montana, western
2440ca2003-03-30Mirar (Pontus Hagland) # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), # New Mexico, southwestern North Dakota, far eastern Oregon, # western South Dakota, far western Texas (El Paso County, Hudspeth County, # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
059cb82000-11-15Mirar (Pontus Hagland) #
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
059cb82000-11-15Mirar (Pontus Hagland) #
2440ca2003-03-30Mirar (Pontus Hagland) # California, northern Idaho, most of Nevada, most of Oregon, and Washington
059cb82000-11-15Mirar (Pontus Hagland) #
c0dbee2000-08-01Mirar (Pontus Hagland) # 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. #
2440ca2003-03-30Mirar (Pontus Hagland) # From Paul Eggert (2001-05-30):
c0dbee2000-08-01Mirar (Pontus Hagland) # 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.
2440ca2003-03-30Mirar (Pontus Hagland) # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, # also a Friday. Include only the time zone part of this transition, # ignoring the switch from Julian to Gregorian, since we can't represent # the Julian calendar. # # As far as we know, none of the exact locations mentioned below were # permanently inhabited in 1867 by anyone using either calendar. # (Yakutat was colonized by the Russians in 1799, but the settlement # was destroyed in 1805 by a Yakutat-kon war party.) However, there # were nearby inhabitants in some cases and for our purposes perhaps # it's best to simply use the official transition.
c0dbee2000-08-01Mirar (Pontus Hagland) # # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2440ca2003-03-30Mirar (Pontus Hagland) Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 -8:57:41 - LMT 1900 Aug 20 12:00
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland) Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 -9:18:55 - LMT 1900 Aug 20 12:00
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland) Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 -9:59:36 - LMT 1900 Aug 20 12:00
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland) Zone America/Nome 12:58:21 - LMT 1867 Oct 18 -11:01:38 - LMT 1900 Aug 20 12:00
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland) Zone America/Adak 12:13:21 - LMT 1867 Oct 18 -11:46:38 - LMT 1900 Aug 20 12:00
c0dbee2000-08-01Mirar (Pontus Hagland)  -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.
2440ca2003-03-30Mirar (Pontus Hagland)  # From Paul Eggert (2002-10-20): # # The information in the rest of this paragraph is derived from the # <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> # Daylight Saving Time web page (2002-01-23)</a> maintained by the # Arizona State Library, Archives and Public Records. # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard # time, but by federal law railroads, airlines, bus lines, military # personnel, and some engaged in interstate commerce continued to # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix # Gazette says that was the date the law changed, and that 04-01 was # the date the state's clocks would change. In 1945 the State of # Arizona used standard time all year, again with exceptions only as # mandated by federal law. Arizona observed DST in 1967, but Arizona # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. # # Shanks says the 1944 experiment came to an end on 1944-03-17. # Go with the Arizona State Library instead.
c0dbee2000-08-01Mirar (Pontus Hagland) Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 -7:00 US M%sT 1944 Jan 1 00:01
2440ca2003-03-30Mirar (Pontus Hagland)  -7:00 - MST 1944 Apr 1 00:01
c0dbee2000-08-01Mirar (Pontus Hagland)  -7:00 US M%sT 1944 Oct 1 00:01 -7:00 - MST 1967
2440ca2003-03-30Mirar (Pontus Hagland)  -7:00 US M%sT 1968 Mar 21
c0dbee2000-08-01Mirar (Pontus Hagland)  -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.
2440ca2003-03-30Mirar (Pontus Hagland)  # From Paul Eggert (2001-03-06), following a tip by Markus Kuhn: # Pam Belluck reported in the New York Times (2001-01-31) that the # Indiana Legislature is considering a bill to adopt DST statewide. # Her article mentioned Vevay, whose post office observes a different # time zone from Danner's Hardware across the street.
c0dbee2000-08-01Mirar (Pontus Hagland) # 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.
059cb82000-11-15Mirar (Pontus Hagland) # This also includes a part of Indiana immediately adjacent to Louisville.
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
059cb82000-11-15Mirar (Pontus Hagland) Link America/Louisville America/Kentucky/Louisville #
c0dbee2000-08-01Mirar (Pontus Hagland) # Wayne, Clinton, and Russell Counties, Kentucky # # 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.
059cb82000-11-15Mirar (Pontus Hagland) # # From Rich Wales (2000-08-29): # After prolonged debate, and despite continuing deep differences of opinion, # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
01c4092001-01-09Mirar (Pontus Hagland) # (-0500) time. They won't "fall back" this year. See Sara Shipley, # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
2440ca2003-03-30Mirar (Pontus Hagland) # # From Paul Eggert (2001-07-16): # The final rule was published in the # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> # Federal Register 65, 160 (2000-08-17), page 50154-50158. # </a> #
059cb82000-11-15Mirar (Pontus Hagland) Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00 -6:00 US C%sT 1946 -6:00 - CST 1968 -6:00 US C%sT 2000 Oct 29 2:00 -5:00 US E%sT # From Rives McDow (2000-08-30): # Here ... are all the changes in the US since 1985. # Kearny County, KS (put all of county on central; # previously split between MST and CST) ... 1990-10 # Starke County, IN (from CST to EST) ... 1991-10 # Oliver County, ND (from MST to CST) ... 1992-10 # West Wendover, NV (from PST TO MST) ... 1999-10 # Wayne County, KY (from CST to EST) ... 2000-10 #
2440ca2003-03-30Mirar (Pontus Hagland) # From Paul Eggert (2001-07-17): # We don't know where the line used to be within Kearny County, KS, # so omit that change for now. # See America/Indiana/Knox for the Starke County, IN change. # See America/North_Dakota/Center for the Oliver County, ND change. # West Wendover, NV officially switched from Pacific to mountain time on # 1999-10-31. See the # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> # Federal Register 64, 203 (1999-10-21), page 56705-56707. # </a> # However, the Federal Register says that West Wendover already operated # on mountain time, and the rule merely made this official; # hence a separate tz entry is not needed.
c0dbee2000-08-01Mirar (Pontus Hagland)  # 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. #
2440ca2003-03-30Mirar (Pontus Hagland) # From Paul Eggert (2001-03-06): # Garland (1927) writes ``Cleveland and Detroit advanced their clocks # one hour in 1914.'' This change is not in Shanks. We have no more # info, so omit this for now. #
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland) # administered by the US Fish and Wildlife Service
c0dbee2000-08-01Mirar (Pontus Hagland) # claimed by US under the provisions of the 1856 Guano Islands Act # also claimed by Haiti # occupied 1857/1900 by the Navassa Phosphate Co
2440ca2003-03-30Mirar (Pontus Hagland) # US lighthouse 1917/1996-09
c0dbee2000-08-01Mirar (Pontus Hagland) # 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). #
2440ca2003-03-30Mirar (Pontus Hagland) # Gwillim Law writes that a good source
c0dbee2000-08-01Mirar (Pontus Hagland) # 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.
059cb82000-11-15Mirar (Pontus Hagland) # Unless otherwise specified, the data for Canada are all from Shanks.
c0dbee2000-08-01Mirar (Pontus Hagland) 
059cb82000-11-15Mirar (Pontus Hagland) # From Paul Eggert (2000-10-02): # H. David Matthews and Mary Vincent's map # <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> # "It's about TIME", _Canadian Geographic_ (September-October 1998) # </a> contains detailed boundaries for regions observing nonstandard # time and daylight saving time arrangements in Canada circa 1998. # # INMS, the Institute for National Measurement Standards in Ottawa, has # <a href="http://www.nrc.ca/inms/time/tze.html"> # information about standard and daylight saving time zones in Canada. # </a> (updated periodically). # Its unofficial information is often taken from Matthews and Vincent.
c0dbee2000-08-01Mirar (Pontus Hagland)  # 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule Canada 1942 only - Feb 9 2:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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
059cb82000-11-15Mirar (Pontus Hagland) # Newfoundland (and far southeast Labrador) # From Paul Eggert (2000-10-02): # Matthews and Vincent (1998) write that Labrador should use NST/NDT, # but the only part of Labrador that follows the rules is the # southeast corner, including Port Hope Simpson and Mary's Harbour, # but excluding, say, Black Tickle.
c0dbee2000-08-01Mirar (Pontus Hagland)  # 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.
2440ca2003-03-30Mirar (Pontus Hagland) Rule StJohns 1942 only - Mar 1 0:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) Rule StJohns 1942 only - Dec 31 0:00 0 S
2440ca2003-03-30Mirar (Pontus Hagland) Rule StJohns 1943 only - May 30 0:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) Rule StJohns 1943 only - Sep 5 0:00 0 S
2440ca2003-03-30Mirar (Pontus Hagland) Rule StJohns 1944 only - Jul 10 0:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) Rule StJohns 1944 only - Sep 2 0:00 0 S
2440ca2003-03-30Mirar (Pontus Hagland) Rule StJohns 1945 only - Jan 1 0:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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
059cb82000-11-15Mirar (Pontus Hagland) Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S # From Paul Eggert (2000-10-02): # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches # at 00:01 local time. For now, assume it started in 1987. Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D Rule StJohns 1987 max - Oct lastSun 0:01 0 S Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
059cb82000-11-15Mirar (Pontus Hagland) # most of east Labrador
c0dbee2000-08-01Mirar (Pontus Hagland)  # 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.
059cb82000-11-15Mirar (Pontus Hagland) # From Paul Eggert (2000-10-02): # INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches # at 00:01 local time. FIXME: verify and create a new Zone for this.
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule Halifax 1942 only - Feb 9 2:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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.
059cb82000-11-15Mirar (Pontus Hagland) # From Paul Eggert (2000-10-02): # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and # New Osnaburgh observe CST all year, that Big Trout Lake observes # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in # violation of the official Ontario rules. # They also write that Quebec east of the -63 meridian is supposed to # observe AST, but residents as far east as Natashquan use EST/EDT, # and residents east of Natashquan use AST. # We probably need Zones for far east Quebec and for Atikokan, # but we don't know when their practices started.
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule Winn 1942 only - Feb 9 2:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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
059cb82000-11-15Mirar (Pontus Hagland) Rule Winn 1966 1986 - Oct lastSun 2:00 0 S
c0dbee2000-08-01Mirar (Pontus Hagland) Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
059cb82000-11-15Mirar (Pontus Hagland) # From Paul Eggert (2000-10-02): # INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from # DST at 03:00 local time. For now, assume it started in 1987. Rule Winn 1987 max - Oct lastSun 2:00s 0 S
c0dbee2000-08-01Mirar (Pontus Hagland) # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 -6:00 Winn C%sT # Saskatchewan
059cb82000-11-15Mirar (Pontus Hagland) # From Paul Eggert (2000-10-02):
c0dbee2000-08-01Mirar (Pontus Hagland) # 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.
059cb82000-11-15Mirar (Pontus Hagland) # Matthews and Vincent (1998) write that Denare Beach and Creighton # are like Winnipeg, in violation of Saskatchewan law.
c0dbee2000-08-01Mirar (Pontus Hagland)  # 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule Regina 1942 only - Feb 9 2:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule Edm 1942 only - Feb 9 2:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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
059cb82000-11-15Mirar (Pontus Hagland) # From Paul Eggert (2000-10-02):
c0dbee2000-08-01Mirar (Pontus Hagland) # Shanks writes that since 1970 most of this region has been like Vancouver. # Dawson Creek uses MST. Much of east BC is like Edmonton.
059cb82000-11-15Mirar (Pontus Hagland) # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
c0dbee2000-08-01Mirar (Pontus Hagland)  # 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule Vanc 1942 only - Feb 9 2:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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
2440ca2003-03-30Mirar (Pontus Hagland) # </a> (1999) reports that Pangnirtung operates on eastern time,
c0dbee2000-08-01Mirar (Pontus Hagland) # and that Coral Harbour does not observe DST. We don't know when
2440ca2003-03-30Mirar (Pontus Hagland) # Pangnirtung switched to eastern time; we'll guess 1995.
c0dbee2000-08-01Mirar (Pontus Hagland) # 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.
059cb82000-11-15Mirar (Pontus Hagland) # From Paul Eggert (2000-10-02): # Matthews and Vincent (1998) say the following, but we lack histories # for these potential new Zones.
2440ca2003-03-30Mirar (Pontus Hagland) #
059cb82000-11-15Mirar (Pontus Hagland) # The Canadian Forces station at Alert uses Eastern Time while the # handful of residents at the Eureka weather station [in the Central # zone] skip daylight savings. Baffin Island, which is crossed by the # Central, Eastern and Atlantic Time zones only uses Eastern Time. # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of # Central Time and Southampton Island [in the Central zone] is not # required to use daylight savings.
01c4092001-01-09Mirar (Pontus Hagland) # From # <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> # Nunavut now has two time zones # </a> (2000-11-10): # The Nunavut government would allow its employees in Kugluktuk and # Cambridge Bay to operate on central time year-round, putting them # one hour behind the rest of Nunavut for six months during the winter. # At the end of October the two communities had rebelled against # Nunavut's unified time zone, refusing to shift to eastern time with # the rest of the territory for the winter. Cambridge Bay remained on # central time, while Kugluktuk, even farther west, reverted to # mountain time, which they had used before the advent of Nunavut's # unified time zone in 1999.
2440ca2003-03-30Mirar (Pontus Hagland) # # From Rives McDow (2001-01-20), quoting the Nunavut government: # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
01c4092001-01-09Mirar (Pontus Hagland)  # From Paul Eggert (2000-12-04): # Let's just keep track of the official times for now.
2440ca2003-03-30Mirar (Pontus Hagland) # From Rives McDow (2001-03-07): # The premier of Nunavut has issued a ministerial statement advising # that effective 2001-04-01, the territory of Nunavut will revert # back to three time zones (mountain, central, and eastern). Of the # cities in Nunavut, Coral Harbor is the only one that I know of that # has said it will not observe dst, staying on EST year round. I'm # checking for more info, and will get back to you if I come up with # more. # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule NT_YK 1942 only - Feb 9 2:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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
01c4092001-01-09Mirar (Pontus Hagland)  -6:00 Canada C%sT 2000 Oct 29 2:00
2440ca2003-03-30Mirar (Pontus Hagland)  -5:00 Canada E%sT
c0dbee2000-08-01Mirar (Pontus Hagland) Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 -5:00 NT_YK E%sT 1999 Oct 31 2:00
01c4092001-01-09Mirar (Pontus Hagland)  -6:00 Canada C%sT 2000 Oct 29 2:00
2440ca2003-03-30Mirar (Pontus Hagland)  -5:00 Canada E%sT
c0dbee2000-08-01Mirar (Pontus Hagland) Zone America/Rankin_Inlet -6:08:40 - LMT 1884
01c4092001-01-09Mirar (Pontus Hagland)  -6:00 NT_YK C%sT 2000 Oct 29 2:00
2440ca2003-03-30Mirar (Pontus Hagland)  -5:00 - EST 2001 Apr 1 3:00 -6:00 Canada C%sT
c0dbee2000-08-01Mirar (Pontus Hagland) Zone America/Cambridge_Bay -7:00:20 - LMT 1884 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2440ca2003-03-30Mirar (Pontus Hagland)  -6:00 Canada C%sT 2000 Oct 29 2:00 -5:00 - EST 2000 Nov 5 0:00 -6:00 - CST 2001 Apr 1 3:00 -7:00 Canada M%sT
c0dbee2000-08-01Mirar (Pontus Hagland) 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
2440ca2003-03-30Mirar (Pontus Hagland) # From Paul Eggert (2001-03-05): # The Investigation and Analysis Service of the # Mexican Library of Congress (MLoC) has published a # <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> # history of Mexican local time (in Spanish) # </a>. # # Here are the discrepancies between Shanks and the MLoC. # (In all cases we go with the MLoC.) # Shanks reports that Baja was at -8:00 in 1922/1923. # Shanks says the 1930 transition in Baja was 1930-11-16. # Shanks reports no DST during summer 1931. # Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01. # Shanks does not report transitions for Baja in 1945 or 1948. # Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. # Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 # on 1997-10-26 at 02:00. # From Gwillim Law (2001-02-20): # There are some other discrepancies between the Decrees page and the # tz database. I think they can best be explained by supposing that # the researchers who prepared the Decrees page failed to find some of # the relevant documents.
c0dbee2000-08-01Mirar (Pontus Hagland) 
de860a2000-08-12Mirar (Pontus Hagland) # From Paul Eggert (2000-07-26): # Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 # and 1988 DST experiments. Go with spin.com.mx.
c0dbee2000-08-01Mirar (Pontus Hagland)  # 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.
2440ca2003-03-30Mirar (Pontus Hagland) # From Jesper Norgaard, translating # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): # In Oaxaca, the 55.000 teachers from the Section 22 of the National # Syndicate of Education Workers, refuse to apply daylight saving each # year, so that the more than 10,000 schools work at normal hour the # whole year. # From Gwillim Law (2001-01-19): # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says # (translated):... # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced # that Summer Time will be reduced from seven to five months, starting # this year.... # <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> # [translated], says "summer time will ... take effect on the first Sunday # in May, and end on the last Sunday of September. # From Arthur David Olson (2001-01-25): # The 2001-01-24 traditional Washington Post contained the page one # story "Timely Issue Divides Mexicans."... # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html # ... Mexico City Mayor Lopez Obrador "...is threatening to keep # Mexico City and its 20 million residents on a different time than # the rest of the country..." In particular, Lopez Obrador would abolish # observation of Daylight Saving Time. # <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> # Official statute published by the Energy Department # </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, # and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). # From Paul Eggert (2001-03-03): # # <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> # James F. Smith writes in today's LA Times # </a> # * Sonora will continue to observe standard time. # * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that # the Federal District will not adopt DST. # * 4 of 16 district leaders announced they'll ignore the decree. # * The decree does not affect federal-controlled facilities including # the airport, banks, hospitals, and schools. # # For now we'll assume that the Federal District will bow to federal rules. # From Jesper Norgaard (2001-04-01): # I found some references to the Mexican application of daylight # saving, which modifies what I had already sent you, stating earlier # that a number of northern Mexican states would go on daylight # saving. The modification reverts this to only cover Baja California # (Norte), while all other states (except Sonora, who has no daylight # saving all year) will follow the original decree of president # Vicente Fox, starting daylight saving May 6, 2001 and ending # September 30, 2001. # References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) # From Reuters (2001-09-04): # Mexico's Supreme Court on Tuesday declared that daylight savings was # unconstitutional in Mexico City, creating the possibility the # capital will be in a different time zone from the rest of the nation # next year.... The Supreme Court's ruling takes effect at 2:00 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to # standard time. "This is so residents of the Federal District are not # subject to unexpected time changes," a statement from the court said. # From Jesper Norgaard Welen (2002-03-12): # ... consulting my local grocery store(!) and my coworkers, they all insisted # that a new decision had been made to reinstate US style DST in Mexico.... # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) # confirms this. Sonora as usual is the only state where DST is not applied.
01c4092001-01-09Mirar (Pontus Hagland) 
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule Mexico 1943 only - Dec 16 0:00 1:00 W
c0dbee2000-08-01Mirar (Pontus Hagland) 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
2440ca2003-03-30Mirar (Pontus Hagland) Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D Rule Mexico 2001 only - Sep lastSun 2:00 0 S Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D Rule Mexico 2002 max - Oct lastSun 2:00 0 S
c0dbee2000-08-01Mirar (Pontus Hagland) # Zone NAME GMTOFF RULES FORMAT [UNTIL] # Quintana Roo Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2440ca2003-03-30Mirar (Pontus Hagland)  -6:00 - CST 1981 Dec 23
c0dbee2000-08-01Mirar (Pontus Hagland)  -5:00 Mexico E%sT 1998 Aug 2 2:00 -6:00 Mexico C%sT
de860a2000-08-12Mirar (Pontus Hagland) # Campeche, Yucatan Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2440ca2003-03-30Mirar (Pontus Hagland)  -6:00 - CST 1981 Dec 23
de860a2000-08-12Mirar (Pontus Hagland)  -5:00 - EST 1982 Dec 2 -6:00 Mexico C%sT # Coahuila, Durango, Nuevo Leon, Tamaulipas
2440ca2003-03-30Mirar (Pontus Hagland) Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
de860a2000-08-12Mirar (Pontus Hagland)  -6:00 - CST 1988 -6:00 US C%sT 1989 -6:00 Mexico C%sT
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
2440ca2003-03-30Mirar (Pontus Hagland)  -7:00 - MST 1932 Apr 1 -6:00 Mexico C%sT 2001 Sep 30 02:00 -6:00 - CST 2002 Feb 20
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland)  -7:00 - MST 1932 Apr 1
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland)  -7:00 - MST 1932 Apr 1
de860a2000-08-12Mirar (Pontus Hagland)  -6:00 - CST 1942 Apr 24
c0dbee2000-08-01Mirar (Pontus Hagland)  -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 -7:00 Mexico M%sT 1999 -7:00 - MST
de860a2000-08-12Mirar (Pontus Hagland) # Baja California Sur, Nayarit, Sinaloa
c0dbee2000-08-01Mirar (Pontus Hagland) 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
2440ca2003-03-30Mirar (Pontus Hagland)  -7:00 - MST 1932 Apr 1
de860a2000-08-12Mirar (Pontus Hagland)  -6:00 - CST 1942 Apr 24
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland)  -7:00 - MST 1924
c0dbee2000-08-01Mirar (Pontus Hagland)  -8:00 - PST 1927 Jun 10 23:00
2440ca2003-03-30Mirar (Pontus Hagland)  -7:00 - MST 1930 Nov 15 -8:00 - PST 1931 Apr 1 -8:00 1:00 PDT 1931 Sep 30
de860a2000-08-12Mirar (Pontus Hagland)  -8:00 - PST 1942 Apr 24
2440ca2003-03-30Mirar (Pontus Hagland)  -8:00 1:00 PWT 1945 Nov 12 -8:00 - PST 1948 Apr 5 -8:00 1:00 PDT 1949 Jan 14 -8:00 - PST 1954 -8:00 CA P%sT 1961 -8:00 - PST 1976
c0dbee2000-08-01Mirar (Pontus Hagland)  -8:00 US P%sT 1996
2440ca2003-03-30Mirar (Pontus Hagland)  -8:00 Mexico P%sT 2001 -8:00 US P%sT 2002 Feb 20
c0dbee2000-08-01Mirar (Pontus Hagland)  -8:00 Mexico P%sT
2440ca2003-03-30Mirar (Pontus Hagland) # From Paul Eggert (2001-03-05): # Formerly there was an America/Ensenada zone, which differed from # America/Tijuana only in that it did not observe DST from 1976 # through 1995. This was as per Shanks. However, Guy Harris reports # that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and # Tijuana observe DST," which contradicts Shanks but does imply that # DST-observance was a town-by-town matter back then. This concerns # data after 1970 so most likely there should be at least one Zone # other than America/Tijuana for Baja, but it's not clear yet what its # name or contents should be.
c0dbee2000-08-01Mirar (Pontus Hagland) # # 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
01c4092001-01-09Mirar (Pontus Hagland)  # From Steffen Thorsen (2000-10-30): # Enrique Morales reported to me that the Dominican Republic has changed the # time zone to Eastern Standard Time as of Sunday 29 at 2 am.... # http://www.listin.com.do/antes/261000/republica/princi.html # From Paul Eggert (2000-12-04): # That URL (2000-10-26, in Spanish) says they planned to use US-style DST. # From Rives McDow (2000-12-01): # Dominican Republic changed its mind and presidential decree on Tuesday, # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the # Dominican Republic will be reverting to 8 hours from the International Date # Line, and will not be using DST in the foreseeable future. The reason they # decided to use DST was to be in synch with Puerto Rico, who was also going # to implement DST. When Puerto Rico didn't implement DST, the president # decided to revert.
c0dbee2000-08-01Mirar (Pontus Hagland) # 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
01c4092001-01-09Mirar (Pontus Hagland)  -4:00 - AST 2000 Oct 29 02:00 -5:00 US E%sT 2000 Dec 3 01:00
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland)  -4:04:20 - FFMT 1911 May # Fort-de-France MT
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland)  -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland)  -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
c0dbee2000-08-01Mirar (Pontus Hagland)  -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
2440ca2003-03-30Mirar (Pontus Hagland)  -4:04:00 - CMT 1912 # Castries Mean Time
c0dbee2000-08-01Mirar (Pontus Hagland)  -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