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Diffstat (limited to 'src/timezone/data/northamerica')
| -rw-r--r-- | src/timezone/data/northamerica | 1968 |
1 files changed, 1968 insertions, 0 deletions
diff --git a/src/timezone/data/northamerica b/src/timezone/data/northamerica new file mode 100644 index 0000000000..fd6aa734ba --- /dev/null +++ b/src/timezone/data/northamerica @@ -0,0 +1,1968 @@ +# @(#)northamerica 7.67 +# 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 (2001-03-06): +# Daylight Saving Time was first suggested as a joke by Benjamin Franklin +# in his whimsical essay ``An Economical Project for Diminishing the Cost +# of Light'' published in the Journal de Paris (1784-04-26). +# 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 +# +# 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". + +# 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. + +# 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 +# to switch to London for Attlee's address, but the American people +# 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 +# London which were to precede Mr. Attlee's speech. + +# 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. + +# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S +Rule US 1918 1919 - Mar lastSun 2:00 1:00 D +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 - Aug 14 23:00u 1:00 P # Peace +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. +# +# 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". + + +# US eastern time, represented by New York + +# Connecticut, Delaware, District of Columbia, most of Florida, +# 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 + +# 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 + +# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, +# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and +# Washington counties), Illinois, western Indiana +# (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 + +# 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 +# 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 + +# US mountain time, represented by Denver +# +# Colorado, far western Kansas, Montana, western +# 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 +# +# 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 +# +# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, +# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), +# most of Nevada, most of Oregon, and Washington +# +# 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 (2001-05-30): +# 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, 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. +# +# Zone NAME GMTOFF RULES FORMAT [UNTIL] +Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 + -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 14:41:05 - LMT 1867 Oct 18 + -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 14:00:24 - LMT 1867 Oct 18 + -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 12:58:21 - LMT 1867 Oct 18 + -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 12:13:21 - LMT 1867 Oct 18 + -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. + +# 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. + +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 Apr 1 00:01 + -7:00 US M%sT 1944 Oct 1 00:01 + -7:00 - MST 1967 + -7:00 US M%sT 1968 Mar 21 + -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 1987-12-28 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 (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, +# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, +# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, +# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, +# Teton, Twin Falls, Valley, Washington counties) 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. + +# 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. + +# 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. +# This also includes a part of Indiana immediately adjacent to Louisville. +# 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 +Link America/Louisville America/Kentucky/Louisville +# +# 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. +# +# 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 +# (-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). +# +# 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> +# +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 +# +# 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. + +# 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. +# +# 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. +# +# 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 +# administered by the US Fish and Wildlife Service +# 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 1917/1996-09 +# 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 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. +# +# Other sources occasionally used include: +# +# Edward W. Whitman, World Time Differences, +# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), +# which I found in the UCLA library. +# +# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> +# William Willett, The Waste of Daylight, 19th edition +# </a> (1914-03) +# +# 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. + +# Unless otherwise specified, the data for Canada are all from Shanks. + +# 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. + +# 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 W # War +Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace +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 (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. + +# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S +Rule StJohns 1917 only - Apr 8 2:00 1:00 D +Rule StJohns 1917 only - Sep 17 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 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks. +Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D +Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S +# Whitman gives the following transitions: +# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 +# but go with Shanks and assume they used Canadian rules. +# 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 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 +# 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 1918 + -3:30:52 Canada N%sT 1919 + -3:30:52 StJohns N%sT 1935 Mar 30 + -3:30 StJohns N%sT 1942 May 11 + -3:30 Canada N%sT 1946 + -3:30 StJohns N%sT + +# most of 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 - NST 1918 + -3:30:52 Canada N%sT 1919 + -3:30:52 - NST 1935 Mar 30 + -3:30 - NST 1936 + -3:30 StJohns N%sT 1942 May 11 + -3:30 Canada N%sT 1946 + -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. + +# 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. + + +# 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 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 1932 only - May 1 0:00 1:00 D +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 1946 1949 - Sep lastSun 2:00 0 S +Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D +Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S +Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D +Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S +Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D +Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D +Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S +# Zone NAME GMTOFF RULES FORMAT [UNTIL] +Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 + -4:00 Halifax A%sT 1918 + -4:00 Canada A%sT 1919 + -4:00 Halifax A%sT 1942 Feb 9 2:00s + -4:00 Canada A%sT 1946 + -4:00 Halifax A%sT 1974 + -4:00 Canada 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 1974 + -4:00 Canada A%sT + + +# Ontario, Quebec + +# From Paul Eggert (1996-06-12): +# Shanks writes that since 1970 most of Ontario has been like Toronto, +# and most of Quebec 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 Mark Brader (2003-07-26): +# [According to the Toronto Star] Orillia, Ontario, adopted DST +# effective Saturday, 1912-06-22, 22:00; the article mentions that +# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw +# have already done so. In Orillia DST was to run until Saturday, +# 1912-08-31 (no time mentioned), but it was met with considerable +# hostility from certain segments of the public, and was revoked after +# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but +# presumably that should be -07-06. (1912-06-19, -07-12; also letters +# earlier in June). +# +# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). + +# From Paul Eggert (1997-10-17): +# Mark Brader 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. + +# 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. + +# 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 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 1922 - Oct Sun>=1 2:30 0 S +Rule Mont 1921 only - May 1 2:00 1:00 D +Rule Mont 1922 only - Apr 30 2:00 1:00 D +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 +# The 1927-to-1937 rules can be expressed more simply as +# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D +# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S +# The rules below avoid use of 24:00 +# (which pre-1998 versions of zic cannot handle). +Rule Mont 1927 only - May 1 0:00 1:00 D +Rule Mont 1927 1932 - Sep lastSun 0:00 0 S +Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D +Rule Mont 1932 only - May 1 0:00 1:00 D +Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D +Rule Mont 1933 only - Oct 1 0:00 0 S +Rule Mont 1934 1939 - Sep lastSun 0:00 0 S +Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D +Rule Mont 1945 1948 - Sep lastSun 2:00 0 S +Rule Mont 1949 1950 - Oct lastSun 2:00 0 S +Rule Mont 1951 1956 - Sep lastSun 2:00 0 S +Rule Mont 1957 1973 - Oct lastSun 2:00 0 S + +Rule Toronto 1919 only - Mar 30 23:30 1:00 D +Rule Toronto 1919 only - Oct 26 0:00 0 S +Rule Toronto 1920 only - May 2 2:00 1:00 D +Rule Toronto 1920 only - Sep 26 0:00 0 S +Rule Toronto 1921 only - May 15 2:00 1:00 D +Rule Toronto 1921 only - Sep 15 2:00 0 S +Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D +# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant. +Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S +Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D +Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S +Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D +Rule Toronto 1932 only - May 1 2:00 1:00 D +Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D +Rule Toronto 1933 only - Oct 1 2:00 0 S +Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S +Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S +Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D +Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D +Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S +Rule Toronto 1949 only - Nov lastSun 0:00 0 S +Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D +Rule Toronto 1950 only - Nov lastSun 2:00 0 S +Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S +# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24, +# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue +# of the Toronto Star, and it said that DST ended 1971-10-31 as usual. +Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S + +# From Paul Eggert (2003-07-27): +# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and +# Port Arthur, Ontario, the principle of the Bill has been in +# operation for the past three years, and in the City of Moose Jaw, +# Saskatchewan, for one year." + +# From David Bryan via Tory Tronrud, Director/Curator, +# Thunder Bay Museum (2003-11-12): +# There is some suggestion, however, that, by-law or not, daylight +# savings time was being practiced in Fort William and Port Arthur +# before 1909.... [I]n 1910, the line between the Eastern and Central +# Time Zones was permanently moved about two hundred miles west to +# include the Thunder Bay area.... When Canada adopted daylight +# savings time in 1916, Fort William and Port Arthur, having done so +# already, did not change their clocks.... During the Second World +# War,... [t]he cities agreed to implement DST during the summer +# months for the remainder of the war years. + +# Zone NAME GMTOFF RULES FORMAT [UNTIL] +Zone America/Montreal -4:54:16 - LMT 1884 + -5:00 Mont E%sT 1918 + -5:00 Canada E%sT 1919 + -5:00 Mont E%sT 1942 Feb 9 2:00s + -5:00 Canada E%sT 1946 + -5:00 Mont E%sT 1974 + -5:00 Canada E%sT +Zone America/Toronto -5:17:32 - LMT 1895 + -5:00 Canada E%sT 1919 + -5:00 Toronto E%sT 1942 Feb 9 2:00s + -5:00 Canada E%sT 1946 + -5:00 Toronto E%sT 1974 + -5:00 Canada E%sT +Zone America/Thunder_Bay -5:57:00 - LMT 1895 + -6:00 - CST 1910 + -5:00 - EST 1942 + -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 1940 Sep 29 + -5:00 1:00 EDT 1942 Feb 9 2:00s + -5:00 Canada E%sT +Zone America/Rainy_River -6:17:56 - LMT 1895 + -6:00 Canada C%sT 1940 Sep 29 + -6:00 1:00 CDT 1942 Feb 9 2:00s + -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 W # War +Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace +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 1986 - Oct lastSun 2:00 0 S +Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D +# 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 +# Zone NAME GMTOFF RULES FORMAT [UNTIL] +Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 + -6:00 Winn C%sT + + +# Saskatchewan + +# From Mark Brader (2003-07-26): +# The first actual adoption of DST in Canada was at the municipal +# level. As the [Toronto] Star put it (1912-06-07), "While people +# elsewhere have long been talking of legislation to save daylight, +# the city of Moose Jaw [Saskatchewan] has acted on its own hook." +# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: +# presumably late evening, as below), and would run until "the end of +# the summer". The discrepancy between municipal time and railroad +# time was noted. + +# From Paul Eggert (2003-07-27): +# Willett (1914-03) notes that DST "has been in operation ... in the +# City of Moose Jaw, Saskatchewan, for one year." + +# From Paul Eggert (2000-10-02): +# 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. +# Matthews and Vincent (1998) write that Denare Beach and Creighton +# are like Winnipeg, in violation of Saskatchewan law. + +# 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 W # War +Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace +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 1957 - Apr lastSun 2:00 1:00 D +Rule Regina 1947 1957 - Sep lastSun 2:00 0 S +Rule Regina 1959 only - Apr lastSun 2:00 1:00 D +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 W # War +Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace +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 (2000-10-02): +# Shanks writes that since 1970 most of this region has been like Vancouver. +# Dawson Creek uses MST. Much of east BC is like Edmonton. +# Matthews and Vincent (1998) write that Creston is like Dawson Creek. + +# 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 W # War +Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace +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. + +# From Paul Eggert (2000-10-02): +# Matthews and Vincent (1998) say the following, but we lack histories +# for these potential new Zones. +# +# 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. + +# 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. +# +# From Rives McDow (2001-01-20), quoting the Nunavut government: +# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. + +# From Paul Eggert (2000-12-04): +# Let's just keep track of the official times for now. + +# 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).] + +# 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 W # War +Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace +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 2000 Oct 29 2:00 + -5:00 Canada E%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 2000 Oct 29 2:00 + -5:00 Canada E%sT +Zone America/Rankin_Inlet -6:08:40 - LMT 1884 + -6:00 NT_YK C%sT 2000 Oct 29 2:00 + -5:00 - EST 2001 Apr 1 3:00 + -6:00 Canada 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 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 +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 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. + +# 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. + +# 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 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. + +# 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 W # War +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 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 +# Zone NAME GMTOFF RULES FORMAT [UNTIL] +# Quintana Roo +Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 + -6:00 - CST 1981 Dec 23 + -5:00 Mexico E%sT 1998 Aug 2 2:00 + -6:00 Mexico C%sT +# Campeche, Yucatan +Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 + -6:00 - CST 1981 Dec 23 + -5:00 - EST 1982 Dec 2 + -6:00 Mexico C%sT +# Coahuila, Durango, Nuevo Leon, Tamaulipas +Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 + -6:00 - CST 1988 + -6:00 US C%sT 1989 + -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 Apr 1 + -6:00 Mexico C%sT 2001 Sep 30 02:00 + -6:00 - CST 2002 Feb 20 + -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 Apr 1 + -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 Apr 1 + -6:00 - CST 1942 Apr 24 + -7:00 - MST 1949 Jan 14 + -8:00 - PST 1970 + -7:00 Mexico M%sT 1999 + -7:00 - MST +# Baja California Sur, 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 Apr 1 + -6:00 - CST 1942 Apr 24 + -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 + -7:00 - MST 1924 + -8:00 - PST 1927 Jun 10 23:00 + -7:00 - MST 1930 Nov 15 + -8:00 - PST 1931 Apr 1 + -8:00 1:00 PDT 1931 Sep 30 + -8:00 - PST 1942 Apr 24 + -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 + -8:00 US P%sT 1996 + -8:00 Mexico P%sT 2001 + -8:00 US P%sT 2002 Feb 20 + -8:00 Mexico P%sT +# 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. +# +# 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 + +# 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. + + +# 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 2000 Oct 29 02:00 + -5:00 US E%sT 2000 Dec 3 01:00 + -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 use America/El_Salvador +# instead of America/San_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 + -4:04:20 - 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 + -5:45:12 - 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 + -5:19:36 - CMT 1908 Apr 22 # Colon 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 + -4:04:00 - 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 - PMST 1987 # Pierre & Miquelon Time + -3:00 Canada PM%sT + +# 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 |