northamerica revision 149514
1149514Swollman# @(#)northamerica 7.78 22742Swollman# also includes Central America and the Caribbean 32742Swollman 42742Swollman# This data is by no means authoritative; if you think you know better, 52742Swollman# go ahead and edit the file (and please send any changes to 62742Swollman# tz@elsie.nci.nih.gov for general use in the future). 72742Swollman 8149514Swollman# From Paul Eggert (1999-03-22): 92742Swollman# A reliable and entertaining source about time zones is 1058787Sru# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 112742Swollman 122742Swollman############################################################################### 132742Swollman 142742Swollman# United States 152742Swollman 1658787Sru# From Paul Eggert (1999-03-31): 1758787Sru# Howse writes (pp 121-125) that time zones were invented by 1858787Sru# Professor Charles Ferdinand Dowd (1825-1904), 1958787Sru# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 2058787Sru# His pamphlet ``A System of National Time for Railroads'' (1870) 2158787Sru# was the result of his proposals at the Convention of Railroad Trunk Lines 2258787Sru# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 2358787Sru# but in 1872-05 he moved the proposed origin to Greenwich. 2458787Sru# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 2558787Sru# and the most of the country soon followed suit. 2658787Sru 27149514Swollman# From Paul Eggert (2005-04-16): 28149514Swollman# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 29149514Swollman# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 30149514Swollman 31149514Swollman# From Paul Eggert (1995-12-19): 3214343Swollman# A good source for time zone historical data in the US is 3314343Swollman# Thomas G. Shanks, The American Atlas (5th edition), 3414343Swollman# San Diego: ACS Publications, Inc. (1991). 3514343Swollman# Make sure you have the errata sheet; the book is somewhat useless without it. 36149514Swollman# It is the source for most of the pre-1991 US and Puerto Rico entries below. 3714343Swollman 3875267Swollman# From Paul Eggert (2001-03-06): 3917200Swollman# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 4075267Swollman# in his whimsical essay ``An Economical Project for Diminishing the Cost 4175267Swollman# of Light'' published in the Journal de Paris (1784-04-26). 4217200Swollman# Not everyone is happy with the results: 4317200Swollman# 4417200Swollman# I don't really care how time is reckoned so long as there is some 4517200Swollman# agreement about it, but I object to being told that I am saving 4617200Swollman# daylight when my reason tells me that I am doing nothing of the kind. 4717200Swollman# I even object to the implication that I am wasting something 4817200Swollman# valuable if I stay in bed after the sun has risen. As an admirer 4917200Swollman# of moonlight I resent the bossy insistence of those who want to 5017200Swollman# reduce my time for enjoying it. At the back of the Daylight Saving 5117200Swollman# scheme I detect the bony, blue-fingered hand of Puritanism, eager 5217200Swollman# to push people into bed earlier, and get them up earlier, to make 5317200Swollman# them healthy, wealthy and wise in spite of themselves. 5417200Swollman# 55149514Swollman# -- Robertson Davies, The diary of Samuel Marchbanks, 56149514Swollman# Clarke, Irwin (1947), XIX, Sunday 5775267Swollman# 5875267Swollman# For more about the first ten years of DST in the United States, see 5975267Swollman# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 6075267Swollman# Ten years of daylight saving from the Pittsburgh standpoint 6175267Swollman# (Carnegie Library of Pittsburgh, 1927)</a>. 6275267Swollman# 6375267Swollman# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 6475267Swollman# However, DST was imposed by the Standard Time Act of 1918, which 6575267Swollman# was the first nationwide legal time standard, and apparently 6675267Swollman# time was just called "Standard Time" or "Daylight Saving Time". 6717200Swollman 682742Swollman# From Arthur David Olson: 692742Swollman# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 7019878Swollman# See, for example, the front page of the Saturday, 1974-10-26 7119878Swollman# and Sunday, 1974-10-27 editions of the Washington Post. 722742Swollman 732742Swollman# From Arthur David Olson: 742742Swollman# Before the Uniform Time Act of 1966 took effect in 1967, observance of 752742Swollman# Daylight Saving Time in the US was by local option, except during wartime. 762742Swollman 7767578Swollman# From Arthur David Olson (2000-09-25): 7867578Swollman# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 7967578Swollman# In the introduction, Oboler spoke of "Eastern Peace Time." 8067578Swollman# An AltaVista search turned up 8167578Swollman# <a href="http://rowayton.org/rhs/hstaug45.html">: 8267578Swollman# "When the time is announced over the radio now, it is 'Eastern Peace 8367578Swollman# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 8467578Swollman# </a> (August 1945) by way of confirmation. 8567578Swollman 86149514Swollman# From Joseph Gallant citing 8767578Swollman# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 8867578Swollman# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 8986222Swollman# to switch to London for Attlee's address, but the American people 9067578Swollman# never got to hear his speech live. According to one press account, 9167578Swollman# CBS' Bob Trout was first to announce the word of Japan's surrender, 9267578Swollman# but a few seconds later, NBC, ABC and Mutual also flashed the word 9367578Swollman# of surrender, all of whom interrupting the bells of Big Ben in 9486222Swollman# London which were to precede Mr. Attlee's speech. 9567578Swollman 96114173Swollman# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 97114173Swollman# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 98114173Swollman# 99114173Swollman# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 100114173Swollman# Any announcement from Asia would reach St. John's New York newsroom on a 101114173Swollman# wire service teletype machine, which had prescribed signals for major news. 102114173Swollman# Associated Press, for example, would ring five bells before spewing out 103114173Swollman# typed copy of an important story, and 10 bells for news "of transcendental 104114173Swollman# importance." 105114173Swollman# 106114173Swollman# On Aug. 14, stalling while talking steadily into the NBC networks' open 107114173Swollman# microphone, St. John heard five bells and waited only to hear a sixth bell, 108114173Swollman# before announcing confidently: "Ladies and gentlemen, World War II is over. 109114173Swollman# The Japanese have agreed to our surrender terms." 110114173Swollman# 111114173Swollman# He had scored a 20-second scoop on other broadcasters. 112114173Swollman 1132742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11475267SwollmanRule US 1918 1919 - Mar lastSun 2:00 1:00 D 1152742SwollmanRule US 1918 1919 - Oct lastSun 2:00 0 S 1162742SwollmanRule US 1942 only - Feb 9 2:00 1:00 W # War 11767578SwollmanRule US 1945 only - Aug 14 23:00u 1:00 P # Peace 1182742SwollmanRule US 1945 only - Sep 30 2:00 0 S 119149514SwollmanRule US 1967 2006 - Oct lastSun 2:00 0 S 1202742SwollmanRule US 1967 1973 - Apr lastSun 2:00 1:00 D 1212742SwollmanRule US 1974 only - Jan 6 2:00 1:00 D 1222742SwollmanRule US 1975 only - Feb 23 2:00 1:00 D 1232742SwollmanRule US 1976 1986 - Apr lastSun 2:00 1:00 D 124149514SwollmanRule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 125149514SwollmanRule US 2007 max - Mar Sun>=8 2:00 1:00 D 126149514SwollmanRule US 2007 max - Nov Sun>=1 2:00 0 S 1272742Swollman 12819878Swollman# From Bob Devine (1988-01-28): 1292742Swollman# ...Alaska (and Hawaii) had the timezone names changed in 1967. 1302742Swollman# old new 1312742Swollman# Pacific Standard Time(PST) -same- 1322742Swollman# Yukon Standard Time(YST) -same- 1332742Swollman# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 1342742Swollman# Nome Standard Time (NT) Bering Standard Time (BST) 1352742Swollman# 1362742Swollman# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 1372742Swollman# The YST zone now covers nearly all of the state, AHST just part 1382742Swollman# of the Aleutian islands. No DST. 1392742Swollman 14014343Swollman# From Paul Eggert (1995-12-19): 14114343Swollman# The tables below use `NST', not `NT', for Nome Standard Time. 14214343Swollman# I invented `CAWT' for Central Alaska War Time. 14314343Swollman 14419878Swollman# From U. S. Naval Observatory (1989-01-19): 1452742Swollman# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 1462742Swollman# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 1472742Swollman# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 1482742Swollman# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 1492742Swollman# USA MOUNTAIN 7 H BEHIND UTC DENVER 1502742Swollman# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 1512742Swollman# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 1522742Swollman# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 1532742Swollman# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 1542742Swollman# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 1552742Swollman# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 1562742Swollman# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 1572742Swollman# USA HAWAII 10 H BEHIND UTC 1582742Swollman# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 1592742Swollman 16019878Swollman# From Arthur David Olson (1989-01-21): 1612742Swollman# The above dates are for 1988. 1622742Swollman# Note the "AKST" and "AKDT" abbreviations, the claim that there's 1632742Swollman# no DST in Samoa, and the claim that there is DST in Alaska and the 1642742Swollman# Aleutians. 1652742Swollman 16619878Swollman# From Arthur David Olson (1988-02-13): 1672742Swollman# Legal standard time zone names, from United States Code (1982 Edition and 1682742Swollman# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 16919878Swollman# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 1702742Swollman# took effect), as explained in sections 263 and 261: 1712742Swollman# (none) 1722742Swollman# United States standard eastern time 1732742Swollman# United States standard mountain time 1742742Swollman# United States standard central time 1752742Swollman# United States standard Pacific time 1762742Swollman# (none) 1772742Swollman# United States standard Alaska time 1782742Swollman# (none) 17919878Swollman# Next, names from 1967-04-01 until 1983-11-30 (the date for 1802742Swollman# public law 98-181): 1812742Swollman# Atlantic standard time 1822742Swollman# eastern standard time 1832742Swollman# central standard time 1842742Swollman# mountain standard time 1852742Swollman# Pacific standard time 1862742Swollman# Yukon standard time 1872742Swollman# Alaska-Hawaii standard time 1882742Swollman# Bering standard time 18919878Swollman# And after 1983-11-30: 1902742Swollman# Atlantic standard time 1912742Swollman# eastern standard time 1922742Swollman# central standard time 1932742Swollman# mountain standard time 1942742Swollman# Pacific standard time 1952742Swollman# Alaska standard time 1962742Swollman# Hawaii-Aleutian standard time 1972742Swollman# Samoa standard time 1982742Swollman# The law doesn't give abbreviations. 19914343Swollman# 20075267Swollman# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 20175267Swollman# Public law 106-564 (2000-12-23) introduced the abbreviation 20275267Swollman# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 20375267Swollman# See the file "australasia". 204149514Swollman 205149514Swollman# From Arthur David Olson, 2005-08-09 206149514Swollman# The following was signed into law on 2005-08-08. 207149514Swollman# 208149514Swollman# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 209149514Swollman# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15 210149514Swollman# U.S.C. 260a(a)) is amended-- 211149514Swollman# (1) by striking `first Sunday of April' and inserting `second 212149514Swollman# Sunday of March'; and 213149514Swollman# (2) by striking `last Sunday of October' and inserting `first 214149514Swollman# Sunday of November'. 215149514Swollman# (b) Effective Date- Subsection (a) shall take effect 1 year after the 216149514Swollman# date of enactment of this Act or March 1, 2007, whichever is later. 217149514Swollman# (c) Report to Congress- Not later than 9 months after the effective 218149514Swollman# date stated in subsection (b), the Secretary shall report to Congress 219149514Swollman# on the impact of this section on energy consumption in the United 220149514Swollman# States. 221149514Swollman# (d) Right to Revert- Congress retains the right to revert the 222149514Swollman# Daylight Saving Time back to the 2005 time schedules once the 223149514Swollman# Department study is complete. 2242742Swollman 22586222Swollman# US eastern time, represented by New York 22675267Swollman 22767578Swollman# Connecticut, Delaware, District of Columbia, most of Florida, 228114173Swollman# Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and 229114173Swollman# Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts, 230114173Swollman# New Hampshire, New Jersey, New York, North Carolina, Ohio, 231114173Swollman# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 232114173Swollman# Vermont, Virginia, West Virginia 23367578Swollman 234149514Swollman# From Dave Cantor (2004-11-02): 235149514Swollman# Early this summer I had the occasion to visit the Mount Washington 236149514Swollman# Observatory weather station atop (of course!) Mount Washington [, NH].... 237149514Swollman# One of the staff members said that the station was on Eastern Standard Time 238149514Swollman# and didn't change their clocks for Daylight Saving ... so that their 239149514Swollman# reports will always have times which are 5 hours behind UTC. 240149514Swollman 24114343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 24214343SwollmanRule NYC 1920 only - Mar lastSun 2:00 1:00 D 24314343SwollmanRule NYC 1920 only - Oct lastSun 2:00 0 S 24414343SwollmanRule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 24514343SwollmanRule NYC 1921 1954 - Sep lastSun 2:00 0 S 24614343SwollmanRule NYC 1955 1966 - Oct lastSun 2:00 0 S 24714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 248149514SwollmanZone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 24914343Swollman -5:00 US E%sT 1920 25014343Swollman -5:00 NYC E%sT 1942 25114343Swollman -5:00 US E%sT 1946 25214343Swollman -5:00 NYC E%sT 1967 25314343Swollman -5:00 US E%sT 2542742Swollman 25586222Swollman# US central time, represented by Chicago 25667578Swollman 257136638Swollman# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 258136638Swollman# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 259136638Swollman# Washington counties), Illinois, western Indiana 260114173Swollman# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 261114173Swollman# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 262114173Swollman# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 263114173Swollman# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 264114173Swollman# western Tennessee, most of Texas, Wisconsin 26567578Swollman 26614343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 26714343SwollmanRule Chicago 1920 only - Jun 13 2:00 1:00 D 26814343SwollmanRule Chicago 1920 1921 - Oct lastSun 2:00 0 S 26914343SwollmanRule Chicago 1921 only - Mar lastSun 2:00 1:00 D 27014343SwollmanRule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 27114343SwollmanRule Chicago 1922 1954 - Sep lastSun 2:00 0 S 27214343SwollmanRule Chicago 1955 1966 - Oct lastSun 2:00 0 S 27314343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 274149514SwollmanZone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 27514343Swollman -6:00 US C%sT 1920 27614343Swollman -6:00 Chicago C%sT 1936 Mar 1 2:00 27714343Swollman -5:00 - EST 1936 Nov 15 2:00 27814343Swollman -6:00 Chicago C%sT 1942 27914343Swollman -6:00 US C%sT 1946 28014343Swollman -6:00 Chicago C%sT 1967 28114343Swollman -6:00 US C%sT 28286222Swollman# Oliver County, ND switched from mountain to central time on 1992-10-25. 283149514SwollmanZone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 28486222Swollman -7:00 US M%sT 1992 Oct 25 02:00 28586222Swollman -6:00 US C%sT 2862742Swollman 28786222Swollman# US mountain time, represented by Denver 28867578Swollman# 289136638Swollman# Colorado, far western Kansas, Montana, western 29086222Swollman# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 29186222Swollman# New Mexico, southwestern North Dakota, far eastern Oregon, 29275267Swollman# western South Dakota, far western Texas (El Paso County, Hudspeth County, 29375267Swollman# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 29467578Swollman# 29514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 29614343SwollmanRule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 29714343SwollmanRule Denver 1920 only - Oct lastSun 2:00 0 S 29814343SwollmanRule Denver 1921 only - May 22 2:00 0 S 29914343SwollmanRule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 30014343SwollmanRule Denver 1965 1966 - Oct lastSun 2:00 0 S 3012742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 302149514SwollmanZone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 30315309Swollman -7:00 US M%sT 1920 30415309Swollman -7:00 Denver M%sT 1942 30515309Swollman -7:00 US M%sT 1946 30615309Swollman -7:00 Denver M%sT 1967 30715309Swollman -7:00 US M%sT 3082742Swollman 30914343Swollman# US Pacific time, represented by Los Angeles 31067578Swollman# 311136638Swollman# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 312136638Swollman# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), 313136638Swollman# most of Nevada, most of Oregon, and Washington 31467578Swollman# 31514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 31614343SwollmanRule CA 1948 only - Mar 14 2:00 1:00 D 31714343SwollmanRule CA 1949 only - Jan 1 2:00 0 S 31814343SwollmanRule CA 1950 1966 - Apr lastSun 2:00 1:00 D 31914343SwollmanRule CA 1950 1961 - Sep lastSun 2:00 0 S 32014343SwollmanRule CA 1962 1966 - Oct lastSun 2:00 0 S 32114343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 322149514SwollmanZone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 32314343Swollman -8:00 US P%sT 1946 32414343Swollman -8:00 CA P%sT 1967 32514343Swollman -8:00 US P%sT 3268029Swollman 32714343Swollman# Alaska 32814343Swollman# AK%sT is the modern abbreviation for -9:00 per USNO. 32914343Swollman# 33086222Swollman# From Paul Eggert (2001-05-30): 33114343Swollman# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 33219878Swollman# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 33375267Swollman# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 33475267Swollman# also a Friday. Include only the time zone part of this transition, 33575267Swollman# ignoring the switch from Julian to Gregorian, since we can't represent 33675267Swollman# the Julian calendar. 33714343Swollman# 33886222Swollman# As far as we know, none of the exact locations mentioned below were 33986222Swollman# permanently inhabited in 1867 by anyone using either calendar. 34086222Swollman# (Yakutat was colonized by the Russians in 1799, but the settlement 34186222Swollman# was destroyed in 1805 by a Yakutat-kon war party.) However, there 34286222Swollman# were nearby inhabitants in some cases and for our purposes perhaps 34386222Swollman# it's best to simply use the official transition. 34486222Swollman# 34514343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 34675267SwollmanZone America/Juneau 15:02:19 - LMT 1867 Oct 18 34775267Swollman -8:57:41 - LMT 1900 Aug 20 12:00 34814343Swollman -8:00 - PST 1942 34914343Swollman -8:00 US P%sT 1946 35014343Swollman -8:00 - PST 1969 35114343Swollman -8:00 US P%sT 1983 Oct 30 2:00 352136638Swollman -9:00 US Y%sT 1983 Nov 30 35314343Swollman -9:00 US AK%sT 35475267SwollmanZone America/Yakutat 14:41:05 - LMT 1867 Oct 18 35575267Swollman -9:18:55 - LMT 1900 Aug 20 12:00 35614343Swollman -9:00 - YST 1942 35714343Swollman -9:00 US Y%sT 1946 35814343Swollman -9:00 - YST 1969 359136638Swollman -9:00 US Y%sT 1983 Nov 30 36014343Swollman -9:00 US AK%sT 36175267SwollmanZone America/Anchorage 14:00:24 - LMT 1867 Oct 18 36275267Swollman -9:59:36 - LMT 1900 Aug 20 12:00 36314343Swollman -10:00 - CAT 1942 36414343Swollman -10:00 US CAT/CAWT 1946 36514343Swollman -10:00 - CAT 1967 Apr 36614343Swollman -10:00 - AHST 1969 36714343Swollman -10:00 US AH%sT 1983 Oct 30 2:00 368136638Swollman -9:00 US Y%sT 1983 Nov 30 36914343Swollman -9:00 US AK%sT 37075267SwollmanZone America/Nome 12:58:21 - LMT 1867 Oct 18 37175267Swollman -11:01:38 - LMT 1900 Aug 20 12:00 37214343Swollman -11:00 - NST 1942 37314343Swollman -11:00 US N%sT 1946 37414343Swollman -11:00 - NST 1967 Apr 37514343Swollman -11:00 - BST 1969 37614343Swollman -11:00 US B%sT 1983 Oct 30 2:00 377136638Swollman -9:00 US Y%sT 1983 Nov 30 37814343Swollman -9:00 US AK%sT 37975267SwollmanZone America/Adak 12:13:21 - LMT 1867 Oct 18 38075267Swollman -11:46:38 - LMT 1900 Aug 20 12:00 38114343Swollman -11:00 - NST 1942 38214343Swollman -11:00 US N%sT 1946 38314343Swollman -11:00 - NST 1967 Apr 38414343Swollman -11:00 - BST 1969 38514343Swollman -11:00 US B%sT 1983 Oct 30 2:00 386136638Swollman -10:00 US AH%sT 1983 Nov 30 38714343Swollman -10:00 US HA%sT 388149514Swollman# The following switches don't quite make our 1970 cutoff. 389149514Swollman# 39014343Swollman# Shanks writes that part of southwest Alaska (e.g. Aniak) 39114343Swollman# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 39214343Swollman# and another part (e.g. Akiak) made the same switch five weeks later. 393149514Swollman# 394149514Swollman# From David Flater (2004-11-09): 395149514Swollman# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 396149514Swollman# Historic Preservation Commission, provided this information, which 397149514Swollman# suggests that Unalaska deviated from statutory time from early 1967 398149514Swollman# possibly until 1983: 399149514Swollman# 400149514Swollman# Minutes of the Unalaska City Council Meeting, January 10, 1967: 401149514Swollman# "Except for St. Paul and Akutan, Unalaska is the only important 402149514Swollman# location not on Alaska Standard Time. The following resolution was 403149514Swollman# made by William Robinson and seconded by Henry Swanson: Be it 404149514Swollman# resolved that the City of Unalaska hereby goes to Alaska Standard 405149514Swollman# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 406149514Swollman# January 14, Alaska Standard Time.) This resolution was passed with 407149514Swollman# three votes for and one against." 4082742Swollman 40914343Swollman# Hawaii 41014343Swollman# 41114343Swollman# From Arthur David Olson: 41214343Swollman# And then there's Hawaii. 41314343Swollman# DST was observed for one day in 1933; 41414343Swollman# standard time was changed by half an hour in 1947; 41514343Swollman# it's always standard as of 1986. 41614343Swollman# 41714343Swollman# From Paul Eggert: 41814343Swollman# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 41914343Swollman# 42014343SwollmanZone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 42114343Swollman -10:30 - HST 1933 Apr 30 2:00 42214343Swollman -10:30 1:00 HDT 1933 May 21 2:00 42314343Swollman -10:30 US H%sT 1947 Jun 8 2:00 42414343Swollman -10:00 - HST 4252742Swollman 42614343Swollman# Now we turn to US areas that have diverged from the consensus since 1970. 42714343Swollman 42814343Swollman# Arizona mostly uses MST. 429114173Swollman 430114173Swollman# From Paul Eggert (2002-10-20): 431114173Swollman# 432114173Swollman# The information in the rest of this paragraph is derived from the 433114173Swollman# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 434114173Swollman# Daylight Saving Time web page (2002-01-23)</a> maintained by the 435114173Swollman# Arizona State Library, Archives and Public Records. 436114173Swollman# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 437114173Swollman# time, but by federal law railroads, airlines, bus lines, military 438114173Swollman# personnel, and some engaged in interstate commerce continued to 439114173Swollman# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 440114173Swollman# Gazette says that was the date the law changed, and that 04-01 was 441114173Swollman# the date the state's clocks would change. In 1945 the State of 442114173Swollman# Arizona used standard time all year, again with exceptions only as 443114173Swollman# mandated by federal law. Arizona observed DST in 1967, but Arizona 444114173Swollman# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 445114173Swollman# 446114173Swollman# Shanks says the 1944 experiment came to an end on 1944-03-17. 447114173Swollman# Go with the Arizona State Library instead. 448114173Swollman 449149514SwollmanZone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 45014343Swollman -7:00 US M%sT 1944 Jan 1 00:01 451114173Swollman -7:00 - MST 1944 Apr 1 00:01 45214343Swollman -7:00 US M%sT 1944 Oct 1 00:01 45314343Swollman -7:00 - MST 1967 454114173Swollman -7:00 US M%sT 1968 Mar 21 45514343Swollman -7:00 - MST 45619878Swollman# From Arthur David Olson (1988-02-13): 45714343Swollman# A writer from the Inter Tribal Council of Arizona, Inc., 458136638Swollman# notes in private correspondence dated 1987-12-28 that "Presently, only the 4592742Swollman# Navajo Nation participates in the Daylight Saving Time policy, due to its 4602742Swollman# large size and location in three states." (The "only" means that other 4612742Swollman# tribal nations don't use DST.) 4622742Swollman 46314343SwollmanLink America/Denver America/Shiprock 4642742Swollman 465136638Swollman# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 466136638Swollman# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 467136638Swollman# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 468136638Swollman# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 469136638Swollman# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon 470136638Swollman# switched four weeks late in 1974. 471149514Swollman# 47214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 473149514SwollmanZone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 47414343Swollman -8:00 US P%sT 1923 May 13 2:00 47514343Swollman -7:00 US M%sT 1974 47614343Swollman -7:00 - MST 1974 Feb 3 2:00 47714343Swollman -7:00 US M%sT 4782742Swollman 47914343Swollman# Indiana 48014343Swollman# 48158787Sru# For a map of Indiana's time zone regions, see: 48258787Sru# <a href="http://www.mccsc.edu/time.html"> 48358787Sru# What time is it in Indiana? 48458787Sru# </a> (1999-04-06) 48558787Sru# 48614343Swollman# From Paul Eggert (1995-12-19): 48714343Swollman# Indiana generally observes either EST all year, or CST/CDT, 48814343Swollman# but areas near Cincinnati and Louisville use those cities' timekeeping 48914343Swollman# and in 1969 and 1970 the whole state observed daylight time; 49014343Swollman# and there are other exceptions as noted below. 49114343Swollman# Shanks partitions Indiana into 345 regions, each with its own time history, 49214343Swollman# and writes ``Even newspaper reports present contradictory information.'' 49314343Swollman# Fortunately, most of the complexity occurred before our cutoff date of 1970. 49414343Swollman# 49514343Swollman# Since 1970, EST-only Indiana has been like America/Indianapolis, 49614343Swollman# with exceptions noted below for Crawford, Starke, and Switzerland counties. 49714343Swollman# The parts of Indiana not listed below have been like America/Chicago, 49814343Swollman# America/Louisville, or America/New_York. 49914343Swollman# 50014343Swollman# Other than Indianapolis, the Indiana place names are so nondescript 50114343Swollman# that they would be ambiguous if we left them at the `America' level. 50214343Swollman# So we reluctantly put them all in a subdirectory `America/Indiana'. 50314343Swollman# 50414343Swollman# Most of EST-only Indiana last observed DST in 1970. 50575267Swollman 506149514Swollman# From Paul Eggert (2005-08-16): 507149514Swollman# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006, 508149514Swollman# and that many counties may switch either to Central or to Eastern time. 509149514Swollman# The county-by-county decisions have not been made yet, so for now assume 510149514Swollman# that no counties will switch: this assumption is most likely wrong, 511149514Swollman# but it's the best we can do for now. 51275267Swollman 51314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 51414343SwollmanRule Indianapolis 1941 only - Jun 22 2:00 1:00 D 51514343SwollmanRule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 51614343SwollmanRule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 51714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 518149514SwollmanZone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 51914343Swollman -6:00 US C%sT 1920 52014343Swollman -6:00 Indianapolis C%sT 1942 52114343Swollman -6:00 US C%sT 1946 52214343Swollman -6:00 Indianapolis C%sT 1955 Apr 24 2:00 52314343Swollman -5:00 - EST 1957 Sep 29 2:00 52414343Swollman -6:00 - CST 1958 Apr 27 2:00 52514343Swollman -5:00 - EST 1969 52614343Swollman -5:00 US E%sT 1971 527149514Swollman -5:00 - EST 2006 528149514Swollman -5:00 US E%sT 5292742Swollman# 53014343Swollman# Part of Crawford County, Indiana, last observed DST in 1975, 53114343Swollman# and left its clocks alone in 1974. 53214343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 53314343SwollmanRule Marengo 1951 only - Apr lastSun 2:00 1:00 D 53414343SwollmanRule Marengo 1951 only - Sep lastSun 2:00 0 S 53514343SwollmanRule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 53614343SwollmanRule Marengo 1954 1960 - Sep lastSun 2:00 0 S 53714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 538149514SwollmanZone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 53914343Swollman -6:00 US C%sT 1951 54014343Swollman -6:00 Marengo C%sT 1961 Apr 30 2:00 54114343Swollman -5:00 - EST 1969 54214343Swollman -5:00 US E%sT 1974 Jan 6 2:00 54314343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 54414343Swollman -5:00 US E%sT 1976 545149514Swollman -5:00 - EST 2006 546149514Swollman -5:00 US E%sT 54714343Swollman# 54814343Swollman# Starke County, Indiana 54919878Swollman# From Arthur David Olson (1991-10-28): 55019878Swollman# An article on page A3 of the Sunday, 1991-10-27 Washington Post 55114343Swollman# notes that Starke County switched from Central time to Eastern time as of 55219878Swollman# 1991-10-27. 55314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 55414343SwollmanRule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 55514343SwollmanRule Starke 1947 1954 - Sep lastSun 2:00 0 S 55614343SwollmanRule Starke 1955 1956 - Oct lastSun 2:00 0 S 55714343SwollmanRule Starke 1957 1958 - Sep lastSun 2:00 0 S 55814343SwollmanRule Starke 1959 1961 - Oct lastSun 2:00 0 S 55914343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 560149514SwollmanZone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 56114343Swollman -6:00 US C%sT 1947 56214343Swollman -6:00 Starke C%sT 1962 Apr 29 2:00 56314343Swollman -5:00 - EST 1963 Oct 27 2:00 56414343Swollman -6:00 US C%sT 1991 Oct 27 2:00 565149514Swollman -5:00 - EST 2006 566149514Swollman -5:00 US E%sT 56714343Swollman# 56814343Swollman# Switzerland County, Indiana, last observed DST in 1972. 56914343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 570149514SwollmanZone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 57114343Swollman -6:00 US C%sT 1954 Apr 25 2:00 57214343Swollman -5:00 - EST 1969 57314343Swollman -5:00 US E%sT 1973 574149514Swollman -5:00 - EST 2006 575149514Swollman -5:00 US E%sT 5762742Swollman 57714343Swollman# Part of Kentucky left its clocks alone in 1974. 57867578Swollman# This also includes a part of Indiana immediately adjacent to Louisville. 57914343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 58014343SwollmanRule Louisville 1921 only - May 1 2:00 1:00 D 58114343SwollmanRule Louisville 1921 only - Sep 1 2:00 0 S 58214343SwollmanRule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 58314343SwollmanRule Louisville 1941 only - Sep lastSun 2:00 0 S 58414343SwollmanRule Louisville 1946 only - Jun 2 2:00 0 S 58514343SwollmanRule Louisville 1950 1955 - Sep lastSun 2:00 0 S 58614343SwollmanRule Louisville 1956 1960 - Oct lastSun 2:00 0 S 58714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 588149514SwollmanZone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 58914343Swollman -6:00 US C%sT 1921 59014343Swollman -6:00 Louisville C%sT 1942 59114343Swollman -6:00 US C%sT 1946 59214343Swollman -6:00 Louisville C%sT 1961 Jul 23 2:00 59314343Swollman -5:00 - EST 1968 59414343Swollman -5:00 US E%sT 1974 Jan 6 2:00 59514343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 59614343Swollman -5:00 US E%sT 59767578Swollman# 59858787Sru# Wayne, Clinton, and Russell Counties, Kentucky 59958787Sru# 60058787Sru# From 60158787Sru# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 60258787Sru# Lake Cumberland LIFE 60358787Sru# </a> (1999-01-29) via WKYM-101.7: 60458787Sru# Clinton County has joined Wayne County in asking the DoT to change from 60558787Sru# the Central to the Eastern time zone.... The Wayne County government made 60658787Sru# the same request in December. And while Russell County officials have not 60758787Sru# taken action, the majority of respondents to a poll conducted there in 60858787Sru# August indicated they would like to change to "fast time" also. 60958787Sru# The three Lake Cumberland counties are the farthest east of any U.S. 61058787Sru# location in the Central time zone. 61167578Swollman# 61267578Swollman# From Rich Wales (2000-08-29): 61367578Swollman# After prolonged debate, and despite continuing deep differences of opinion, 61467578Swollman# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 61575267Swollman# (-0500) time. They won't "fall back" this year. See Sara Shipley, 61675267Swollman# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 61786222Swollman# 61886222Swollman# From Paul Eggert (2001-07-16): 61986222Swollman# The final rule was published in the 62086222Swollman# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 62186222Swollman# Federal Register 65, 160 (2000-08-17), page 50154-50158. 62286222Swollman# </a> 623114173Swollman# 624149514SwollmanZone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 62567578Swollman -6:00 US C%sT 1946 62667578Swollman -6:00 - CST 1968 62767578Swollman -6:00 US C%sT 2000 Oct 29 2:00 62867578Swollman -5:00 US E%sT 6292742Swollman 63067578Swollman 63167578Swollman# From Rives McDow (2000-08-30): 63267578Swollman# Here ... are all the changes in the US since 1985. 63367578Swollman# Kearny County, KS (put all of county on central; 63467578Swollman# previously split between MST and CST) ... 1990-10 63567578Swollman# Starke County, IN (from CST to EST) ... 1991-10 63667578Swollman# Oliver County, ND (from MST to CST) ... 1992-10 63767578Swollman# West Wendover, NV (from PST TO MST) ... 1999-10 63867578Swollman# Wayne County, KY (from CST to EST) ... 2000-10 63967578Swollman# 64086222Swollman# From Paul Eggert (2001-07-17): 64186222Swollman# We don't know where the line used to be within Kearny County, KS, 64286222Swollman# so omit that change for now. 64386222Swollman# See America/Indiana/Knox for the Starke County, IN change. 64486222Swollman# See America/North_Dakota/Center for the Oliver County, ND change. 64586222Swollman# West Wendover, NV officially switched from Pacific to mountain time on 64686222Swollman# 1999-10-31. See the 64786222Swollman# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 64886222Swollman# Federal Register 64, 203 (1999-10-21), page 56705-56707. 64986222Swollman# </a> 65086222Swollman# However, the Federal Register says that West Wendover already operated 65186222Swollman# on mountain time, and the rule merely made this official; 65286222Swollman# hence a separate tz entry is not needed. 65367578Swollman 65414343Swollman# Michigan 65514343Swollman# 65619878Swollman# From Bob Devine (1988-01-28): 65714343Swollman# Michigan didn't observe DST from 1968 to 1973. 65814343Swollman# 65958787Sru# From Paul Eggert (1999-03-31): 66058787Sru# Shanks writes that Michigan started using standard time on 1885-09-18, 66158787Sru# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 66258787Sru# that Detroit kept 66314343Swollman# 66414343Swollman# local time until 1900 when the City Council decreed that clocks should 66514343Swollman# be put back twenty-eight minutes to Central Standard Time. Half the 66614343Swollman# city obeyed, half refused. After considerable debate, the decision 66714343Swollman# was rescinded and the city reverted to Sun time. A derisive offer to 66814343Swollman# erect a sundial in front of the city hall was referred to the 66914343Swollman# Committee on Sewers. Then, in 1905, Central time was adopted 67014343Swollman# by city vote. 67114343Swollman# 67214343Swollman# This story is too entertaining to be false, so go with Howse over Shanks. 67314343Swollman# 67475267Swollman# From Paul Eggert (2001-03-06): 67575267Swollman# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 67675267Swollman# one hour in 1914.'' This change is not in Shanks. We have no more 67775267Swollman# info, so omit this for now. 67875267Swollman# 67914343Swollman# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 68014343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 68114343SwollmanRule Detroit 1948 only - Apr lastSun 2:00 1:00 D 68214343SwollmanRule Detroit 1948 only - Sep lastSun 2:00 0 S 68314343SwollmanRule Detroit 1967 only - Jun 14 2:00 1:00 D 68414343SwollmanRule Detroit 1967 only - Oct lastSun 2:00 0 S 68514343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 68614343SwollmanZone America/Detroit -5:32:11 - LMT 1905 68714343Swollman -6:00 - CST 1915 May 15 2:00 68814343Swollman -5:00 - EST 1942 68914343Swollman -5:00 US E%sT 1946 69014343Swollman -5:00 Detroit E%sT 1973 69114343Swollman -5:00 US E%sT 1975 69214343Swollman -5:00 - EST 1975 Apr 27 2:00 69314343Swollman -5:00 US E%sT 69414343Swollman# 69514343Swollman# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 69614343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 69714343SwollmanRule Menominee 1946 only - Apr lastSun 2:00 1:00 D 69814343SwollmanRule Menominee 1946 only - Sep lastSun 2:00 0 S 69914343SwollmanRule Menominee 1966 only - Apr lastSun 2:00 1:00 D 70014343SwollmanRule Menominee 1966 only - Oct lastSun 2:00 0 S 70114343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 70214343SwollmanZone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 70314343Swollman -6:00 US C%sT 1946 70414343Swollman -6:00 Menominee C%sT 1969 Apr 27 2:00 70514343Swollman -5:00 - EST 1973 Apr 29 2:00 70614343Swollman -6:00 US C%sT 70714343Swollman 7082742Swollman# Navassa 70986222Swollman# administered by the US Fish and Wildlife Service 71043543Swollman# claimed by US under the provisions of the 1856 Guano Islands Act 71143543Swollman# also claimed by Haiti 71243543Swollman# occupied 1857/1900 by the Navassa Phosphate Co 71386222Swollman# US lighthouse 1917/1996-09 71443543Swollman# currently uninhabited 71543543Swollman# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 71643543Swollman# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 71743543Swollman# Jimmy Skaggs, _The Great Guano Rush_ (1994). 71814343Swollman 71919878Swollman# Old names, for S5 users 72019878Swollman 72119878Swollman# Link LINK-FROM LINK-TO 72219878SwollmanLink America/New_York EST5EDT 72319878SwollmanLink America/Chicago CST6CDT 72419878SwollmanLink America/Denver MST7MDT 72519878SwollmanLink America/Los_Angeles PST8PDT 72619878SwollmanLink America/Indianapolis EST 72719878SwollmanLink America/Phoenix MST 72819878SwollmanLink Pacific/Honolulu HST 72919878Swollman 7302742Swollman################################################################################ 7312742Swollman 7322742Swollman 733149514Swollman# From Paul Eggert (1999-10-29): 73414343Swollman# A good source for time zone historical data outside the US is 73558787Sru# Thomas G. Shanks, The International Atlas (5th edition), 73658787Sru# San Diego: ACS Publications, Inc. (1999). 7372742Swollman# 73886222Swollman# Gwillim Law writes that a good source 73920094Swollman# for recent time zone data is the International Air Transport 74020094Swollman# Association's Standard Schedules Information Manual (IATA SSIM), 74120094Swollman# published semiannually. Law sent in several helpful summaries 74220094Swollman# of the IATA's data after 1990. 74320094Swollman# 74420094Swollman# Except where otherwise noted, Shanks is the source for entries through 1990, 74520094Swollman# and IATA SSIM is the source for entries after 1990. 74620094Swollman# 747121098Swollman# Other sources occasionally used include: 7482742Swollman# 749121098Swollman# Edward W. Whitman, World Time Differences, 750121098Swollman# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 751121098Swollman# which I found in the UCLA library. 752121098Swollman# 753121098Swollman# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 754121098Swollman# William Willett, The Waste of Daylight, 19th edition 755121098Swollman# </a> (1914-03) 756121098Swollman# 7579908Swollman# See the `europe' file for Greenland. 7582742Swollman 7592742Swollman# Canada 7602742Swollman 761149514Swollman# From Alain LaBont<e'> (1994-11-14): 7629908Swollman# I post here the time zone abbreviations standardized in Canada 7639908Swollman# for both English and French in the CAN/CSA-Z234.4-89 standard.... 7649908Swollman# 7659908Swollman# UTC Standard time Daylight savings time 7669908Swollman# offset French English French English 7679908Swollman# -2:30 - - HAT NDT 7689908Swollman# -3 - - HAA ADT 7699908Swollman# -3:30 HNT NST - - 7709908Swollman# -4 HNA AST HAE EDT 7719908Swollman# -5 HNE EST HAC CDT 7729908Swollman# -6 HNC CST HAR MDT 7739908Swollman# -7 HNR MST HAP PDT 7749908Swollman# -8 HNP PST HAY YDT 7759908Swollman# -9 HNY YST - - 7769908Swollman# 7779908Swollman# HN: Heure Normale ST: Standard Time 7789908Swollman# HA: Heure Avanc<e'>e DT: Daylight saving Time 7799908Swollman# 7809908Swollman# A: de l'Atlantique Atlantic 7819908Swollman# C: du Centre Central 7829908Swollman# E: de l'Est Eastern 7839908Swollman# M: Mountain 7849908Swollman# N: Newfoundland 7859908Swollman# P: du Pacifique Pacific 7869908Swollman# R: des Rocheuses 7879908Swollman# T: de Terre-Neuve 7889908Swollman# Y: du Yukon Yukon 7899908Swollman# 790149514Swollman# From Paul Eggert (1994-11-22): 7919908Swollman# Alas, this sort of thing must be handled by localization software. 7922742Swollman 79367578Swollman# Unless otherwise specified, the data for Canada are all from Shanks. 7949908Swollman 79567578Swollman# From Paul Eggert (2000-10-02): 79667578Swollman# H. David Matthews and Mary Vincent's map 79767578Swollman# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> 79867578Swollman# "It's about TIME", _Canadian Geographic_ (September-October 1998) 79967578Swollman# </a> contains detailed boundaries for regions observing nonstandard 80067578Swollman# time and daylight saving time arrangements in Canada circa 1998. 80167578Swollman# 80267578Swollman# INMS, the Institute for National Measurement Standards in Ottawa, has 80367578Swollman# <a href="http://www.nrc.ca/inms/time/tze.html"> 80467578Swollman# information about standard and daylight saving time zones in Canada. 80567578Swollman# </a> (updated periodically). 80667578Swollman# Its unofficial information is often taken from Matthews and Vincent. 8079908Swollman 8082742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 80917200SwollmanRule Canada 1918 only - Apr 14 2:00 1:00 D 81017200SwollmanRule Canada 1918 only - Oct 31 2:00 0 S 811121098SwollmanRule Canada 1942 only - Feb 9 2:00 1:00 W # War 812121098SwollmanRule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 81317200SwollmanRule Canada 1945 only - Sep 30 2:00 0 S 81417200SwollmanRule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 81517200SwollmanRule Canada 1974 max - Oct lastSun 2:00 0 S 81617200SwollmanRule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 81717200Swollman 81817200Swollman 81967578Swollman# Newfoundland (and far southeast Labrador) 82017200Swollman 82167578Swollman# From Paul Eggert (2000-10-02): 82267578Swollman# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 82367578Swollman# but the only part of Labrador that follows the rules is the 82467578Swollman# southeast corner, including Port Hope Simpson and Mary's Harbour, 82567578Swollman# but excluding, say, Black Tickle. 82667578Swollman 82717200Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 828121098SwollmanRule StJohns 1917 only - Apr 8 2:00 1:00 D 8292742SwollmanRule StJohns 1917 only - Sep 17 2:00 0 S 8302742Swollman# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 8312742SwollmanRule StJohns 1919 only - May 5 23:00 1:00 D 8322742SwollmanRule StJohns 1919 only - Aug 12 23:00 0 S 8332742Swollman# For 1931-1935 Whitman gives Apr same date; go with Shanks. 8342742SwollmanRule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 8352742SwollmanRule StJohns 1920 1935 - Oct lastSun 23:00 0 S 836121098Swollman# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks. 837121098SwollmanRule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 838121098SwollmanRule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 839121098Swollman# Whitman gives the following transitions: 840121098Swollman# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 841121098Swollman# but go with Shanks and assume they used Canadian rules. 8422742Swollman# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 8432742Swollman# Apr 30 - Sep 24; go with Shanks. 8442742SwollmanRule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 8452742SwollmanRule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 8462742SwollmanRule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 8472742SwollmanRule StJohns 1951 1959 - Sep lastSun 2:00 0 S 84867578SwollmanRule StJohns 1960 1986 - Oct lastSun 2:00 0 S 84967578Swollman# From Paul Eggert (2000-10-02): 85067578Swollman# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 85167578Swollman# at 00:01 local time. For now, assume it started in 1987. 85267578SwollmanRule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 85367578SwollmanRule StJohns 1987 max - Oct lastSun 0:01 0 S 85467578SwollmanRule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 85567578SwollmanRule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 8562742Swollman# St John's has an apostrophe, but Posix file names can't have apostrophes. 8572742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8582742SwollmanZone America/St_Johns -3:30:52 - LMT 1884 859121098Swollman -3:30:52 StJohns N%sT 1918 860121098Swollman -3:30:52 Canada N%sT 1919 86120094Swollman -3:30:52 StJohns N%sT 1935 Mar 30 862121098Swollman -3:30 StJohns N%sT 1942 May 11 863121098Swollman -3:30 Canada N%sT 1946 8642742Swollman -3:30 StJohns N%sT 8652742Swollman 86667578Swollman# most of east Labrador 86717200Swollman 86820094Swollman# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 86920094Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 87020094SwollmanZone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 871121098Swollman -3:30:52 - NST 1918 872121098Swollman -3:30:52 Canada N%sT 1919 87320094Swollman -3:30:52 - NST 1935 Mar 30 87420094Swollman -3:30 - NST 1936 875121098Swollman -3:30 StJohns N%sT 1942 May 11 876121098Swollman -3:30 Canada N%sT 1946 87720094Swollman -3:30 StJohns N%sT 1966 Mar 15 2:00 87820094Swollman -4:00 StJohns A%sT 87920094Swollman 88020094Swollman 88120094Swollman# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 88220094Swollman 88317200Swollman# From Paul Eggert (1996-06-12): 88417200Swollman# Shanks writes that since 1970 most of this region has been like Halifax. 88517200Swollman# Many locales did not observe peacetime DST until 1972; 88617200Swollman# Glace Bay, NS is the largest that we know of. 88717200Swollman# Shanks also writes that Liverpool, NS was the only town in Canada to observe 88817200Swollman# DST in 1971 but not 1970; for now we'll assume this is a typo. 88917200Swollman 89067578Swollman# From Paul Eggert (2000-10-02): 89167578Swollman# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 89267578Swollman# at 00:01 local time. FIXME: verify and create a new Zone for this. 89367578Swollman 89467578Swollman 8952742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8962742SwollmanRule Halifax 1916 only - Apr 1 0:00 1:00 D 8972742SwollmanRule Halifax 1916 only - Oct 1 0:00 0 S 8982742SwollmanRule Halifax 1920 only - May 9 0:00 1:00 D 8992742SwollmanRule Halifax 1920 only - Aug 29 0:00 0 S 9002742SwollmanRule Halifax 1921 only - May 6 0:00 1:00 D 9012742SwollmanRule Halifax 1921 1922 - Sep 5 0:00 0 S 9022742SwollmanRule Halifax 1922 only - Apr 30 0:00 1:00 D 9032742SwollmanRule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 9042742SwollmanRule Halifax 1923 only - Sep 4 0:00 0 S 9052742SwollmanRule Halifax 1924 only - Sep 15 0:00 0 S 9062742SwollmanRule Halifax 1925 only - Sep 28 0:00 0 S 9072742SwollmanRule Halifax 1926 only - May 16 0:00 1:00 D 9082742SwollmanRule Halifax 1926 only - Sep 13 0:00 0 S 9092742SwollmanRule Halifax 1927 only - May 1 0:00 1:00 D 9102742SwollmanRule Halifax 1927 only - Sep 26 0:00 0 S 9112742SwollmanRule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 9122742SwollmanRule Halifax 1928 only - Sep 9 0:00 0 S 9132742SwollmanRule Halifax 1929 only - Sep 3 0:00 0 S 9142742SwollmanRule Halifax 1930 only - Sep 15 0:00 0 S 9152742SwollmanRule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 916121098SwollmanRule Halifax 1932 only - May 1 0:00 1:00 D 9172742SwollmanRule Halifax 1933 only - Apr 30 0:00 1:00 D 9182742SwollmanRule Halifax 1933 only - Oct 2 0:00 0 S 9192742SwollmanRule Halifax 1934 only - May 20 0:00 1:00 D 9202742SwollmanRule Halifax 1934 only - Sep 16 0:00 0 S 9212742SwollmanRule Halifax 1935 only - Jun 2 0:00 1:00 D 9222742SwollmanRule Halifax 1935 only - Sep 30 0:00 0 S 9232742SwollmanRule Halifax 1936 only - Jun 1 0:00 1:00 D 9242742SwollmanRule Halifax 1936 only - Sep 14 0:00 0 S 9252742SwollmanRule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 9262742SwollmanRule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 9272742SwollmanRule Halifax 1939 only - May 28 0:00 1:00 D 9282742SwollmanRule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 929121098SwollmanRule Halifax 1946 1949 - Sep lastSun 2:00 0 S 930121098SwollmanRule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 931121098SwollmanRule Halifax 1951 1954 - Sep lastSun 2:00 0 S 932121098SwollmanRule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 933121098SwollmanRule Halifax 1956 1959 - Sep lastSun 2:00 0 S 934121098SwollmanRule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 935121098SwollmanRule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 936121098SwollmanRule Halifax 1962 1973 - Oct lastSun 2:00 0 S 9372742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9382742SwollmanZone America/Halifax -4:14:24 - LMT 1902 Jun 15 939121098Swollman -4:00 Halifax A%sT 1918 940121098Swollman -4:00 Canada A%sT 1919 941121098Swollman -4:00 Halifax A%sT 1942 Feb 9 2:00s 942121098Swollman -4:00 Canada A%sT 1946 943121098Swollman -4:00 Halifax A%sT 1974 944121098Swollman -4:00 Canada A%sT 94517200SwollmanZone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 94617200Swollman -4:00 Canada A%sT 1953 94717200Swollman -4:00 Halifax A%sT 1954 94817200Swollman -4:00 - AST 1972 949121098Swollman -4:00 Halifax A%sT 1974 950121098Swollman -4:00 Canada A%sT 9512742Swollman 9528029Swollman 95317200Swollman# Ontario, Quebec 95417200Swollman 95517200Swollman# From Paul Eggert (1996-06-12): 956121098Swollman# Shanks writes that since 1970 most of Ontario has been like Toronto, 957121098Swollman# and most of Quebec has been like Montreal. 95817200Swollman# Thunder Bay skipped DST in 1973. 95917200Swollman# Many smaller locales did not observe peacetime DST until 1974; 96017200Swollman# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 96117200Swollman# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 96217200Swollman 963121098Swollman# From Mark Brader (2003-07-26): 964121098Swollman# [According to the Toronto Star] Orillia, Ontario, adopted DST 965121098Swollman# effective Saturday, 1912-06-22, 22:00; the article mentions that 966121098Swollman# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 967121098Swollman# have already done so. In Orillia DST was to run until Saturday, 968121098Swollman# 1912-08-31 (no time mentioned), but it was met with considerable 969121098Swollman# hostility from certain segments of the public, and was revoked after 970121098Swollman# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 971121098Swollman# presumably that should be -07-06. (1912-06-19, -07-12; also letters 972121098Swollman# earlier in June). 973121098Swollman# 974121098Swollman# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 975121098Swollman 97643014Swollman# From Paul Eggert (1997-10-17): 977121098Swollman# Mark Brader writes that an article in the 1997-10-14 Toronto Star 97843014Swollman# says that Atikokan, Ontario currently does not observe DST, 97943014Swollman# but will vote on 11-10 whether to use EST/EDT. 98043014Swollman# He also writes that the 98143014Swollman# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 98243014Swollman# Ontario Time Act (1990, Chapter T.9) 98343014Swollman# </a> 98443014Swollman# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 98543014Swollman# Officially Atikokan is therefore on CST/CDT, and most likely this report 98643014Swollman# concerns a non-official time observed as a matter of local practice. 98758787Sru# For what it's worth, Shanks says that Atikokan has agreed with 98843014Swollman# Rainy River ever since standard time was introduced. 98943014Swollman 99067578Swollman# From Paul Eggert (2000-10-02): 99167578Swollman# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 99267578Swollman# New Osnaburgh observe CST all year, that Big Trout Lake observes 99367578Swollman# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 99467578Swollman# violation of the official Ontario rules. 99567578Swollman# They also write that Quebec east of the -63 meridian is supposed to 99667578Swollman# observe AST, but residents as far east as Natashquan use EST/EDT, 99767578Swollman# and residents east of Natashquan use AST. 99867578Swollman# We probably need Zones for far east Quebec and for Atikokan, 99967578Swollman# but we don't know when their practices started. 100067578Swollman 10012742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10022742SwollmanRule Mont 1917 only - Mar 25 2:00 1:00 D 10032742SwollmanRule Mont 1917 only - Apr 24 0:00 0 S 10042742SwollmanRule Mont 1919 only - Mar 31 2:30 1:00 D 10052742SwollmanRule Mont 1919 only - Oct 25 2:30 0 S 10062742SwollmanRule Mont 1920 only - May 2 2:30 1:00 D 1007121098SwollmanRule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 10082742SwollmanRule Mont 1921 only - May 1 2:00 1:00 D 10092742SwollmanRule Mont 1922 only - Apr 30 2:00 1:00 D 10102742SwollmanRule Mont 1924 only - May 17 2:00 1:00 D 10112742SwollmanRule Mont 1924 1926 - Sep lastSun 2:30 0 S 10122742SwollmanRule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 1013136638Swollman# The 1927-to-1937 rules can be expressed more simply as 1014136638Swollman# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 1015136638Swollman# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 1016136638Swollman# The rules below avoid use of 24:00 1017136638Swollman# (which pre-1998 versions of zic cannot handle). 1018136638SwollmanRule Mont 1927 only - May 1 0:00 1:00 D 1019136638SwollmanRule Mont 1927 1932 - Sep lastSun 0:00 0 S 1020136638SwollmanRule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 1021136638SwollmanRule Mont 1932 only - May 1 0:00 1:00 D 1022136638SwollmanRule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 1023136638SwollmanRule Mont 1933 only - Oct 1 0:00 0 S 1024136638SwollmanRule Mont 1934 1939 - Sep lastSun 0:00 0 S 1025121098SwollmanRule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 10262742SwollmanRule Mont 1945 1948 - Sep lastSun 2:00 0 S 10272742SwollmanRule Mont 1949 1950 - Oct lastSun 2:00 0 S 10282742SwollmanRule Mont 1951 1956 - Sep lastSun 2:00 0 S 1029121098SwollmanRule Mont 1957 1973 - Oct lastSun 2:00 0 S 1030121098Swollman 1031121098SwollmanRule Toronto 1919 only - Mar 30 23:30 1:00 D 1032121098SwollmanRule Toronto 1919 only - Oct 26 0:00 0 S 1033121098SwollmanRule Toronto 1920 only - May 2 2:00 1:00 D 1034121098SwollmanRule Toronto 1920 only - Sep 26 0:00 0 S 1035121098SwollmanRule Toronto 1921 only - May 15 2:00 1:00 D 1036121098SwollmanRule Toronto 1921 only - Sep 15 2:00 0 S 1037121098SwollmanRule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1038121098Swollman# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant. 1039121098SwollmanRule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1040121098SwollmanRule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1041136638Swollman# The 1927-to-1939 rules can be expressed more simply as 1042136638Swollman# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1043136638Swollman# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1044136638Swollman# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1045136638Swollman# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1046136638Swollman# The rules below avoid use of Sun>=25 1047136638Swollman# (which pre-2004 versions of zic cannot handle). 1048136638SwollmanRule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1049136638SwollmanRule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1050136638SwollmanRule Toronto 1932 only - May 1 2:00 1:00 D 1051136638SwollmanRule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1052136638SwollmanRule Toronto 1933 only - Oct 1 2:00 0 S 1053136638SwollmanRule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1054121098SwollmanRule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1055121098SwollmanRule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1056121098SwollmanRule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1057121098SwollmanRule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1058121098SwollmanRule Toronto 1949 only - Nov lastSun 0:00 0 S 1059121098SwollmanRule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1060121098SwollmanRule Toronto 1950 only - Nov lastSun 2:00 0 S 1061121098SwollmanRule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1062121098Swollman# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24, 1063121098Swollman# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue 1064121098Swollman# of the Toronto Star, and it said that DST ended 1971-10-31 as usual. 1065121098SwollmanRule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1066121098Swollman 1067121098Swollman# From Paul Eggert (2003-07-27): 1068121098Swollman# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1069121098Swollman# Port Arthur, Ontario, the principle of the Bill has been in 1070121098Swollman# operation for the past three years, and in the City of Moose Jaw, 1071136638Swollman# Saskatchewan, for one year." 1072121098Swollman 1073136638Swollman# From David Bryan via Tory Tronrud, Director/Curator, 1074136638Swollman# Thunder Bay Museum (2003-11-12): 1075136638Swollman# There is some suggestion, however, that, by-law or not, daylight 1076136638Swollman# savings time was being practiced in Fort William and Port Arthur 1077136638Swollman# before 1909.... [I]n 1910, the line between the Eastern and Central 1078136638Swollman# Time Zones was permanently moved about two hundred miles west to 1079136638Swollman# include the Thunder Bay area.... When Canada adopted daylight 1080136638Swollman# savings time in 1916, Fort William and Port Arthur, having done so 1081136638Swollman# already, did not change their clocks.... During the Second World 1082136638Swollman# War,... [t]he cities agreed to implement DST during the summer 1083136638Swollman# months for the remainder of the war years. 1084136638Swollman 10852742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10862742SwollmanZone America/Montreal -4:54:16 - LMT 1884 1087121098Swollman -5:00 Mont E%sT 1918 1088121098Swollman -5:00 Canada E%sT 1919 1089121098Swollman -5:00 Mont E%sT 1942 Feb 9 2:00s 1090121098Swollman -5:00 Canada E%sT 1946 1091121098Swollman -5:00 Mont E%sT 1974 1092121098Swollman -5:00 Canada E%sT 1093121098SwollmanZone America/Toronto -5:17:32 - LMT 1895 1094121098Swollman -5:00 Canada E%sT 1919 1095121098Swollman -5:00 Toronto E%sT 1942 Feb 9 2:00s 1096121098Swollman -5:00 Canada E%sT 1946 1097121098Swollman -5:00 Toronto E%sT 1974 1098121098Swollman -5:00 Canada E%sT 109917200SwollmanZone America/Thunder_Bay -5:57:00 - LMT 1895 1100136638Swollman -6:00 - CST 1910 1101136638Swollman -5:00 - EST 1942 110217200Swollman -5:00 Canada E%sT 1970 110317200Swollman -5:00 Mont E%sT 1973 110417200Swollman -5:00 - EST 1974 110517200Swollman -5:00 Canada E%sT 110617200SwollmanZone America/Nipigon -5:53:04 - LMT 1895 1107121098Swollman -5:00 Canada E%sT 1940 Sep 29 1108121098Swollman -5:00 1:00 EDT 1942 Feb 9 2:00s 110917200Swollman -5:00 Canada E%sT 111017200SwollmanZone America/Rainy_River -6:17:56 - LMT 1895 1111121098Swollman -6:00 Canada C%sT 1940 Sep 29 1112121098Swollman -6:00 1:00 CDT 1942 Feb 9 2:00s 111317200Swollman -6:00 Canada C%sT 11142742Swollman 11158029Swollman 111617200Swollman# Manitoba 111719878Swollman 11182742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11192742SwollmanRule Winn 1916 only - Apr 23 0:00 1:00 D 11202742SwollmanRule Winn 1916 only - Sep 17 0:00 0 S 11212742SwollmanRule Winn 1918 only - Apr 14 2:00 1:00 D 11222742SwollmanRule Winn 1918 only - Oct 31 2:00 0 S 11232742SwollmanRule Winn 1937 only - May 16 2:00 1:00 D 112414343SwollmanRule Winn 1937 only - Sep 26 2:00 0 S 1125121098SwollmanRule Winn 1942 only - Feb 9 2:00 1:00 W # War 1126121098SwollmanRule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 11272742SwollmanRule Winn 1945 only - Sep lastSun 2:00 0 S 11282742SwollmanRule Winn 1946 only - May 12 2:00 1:00 D 11292742SwollmanRule Winn 1946 only - Oct 13 2:00 0 S 11302742SwollmanRule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 113114343SwollmanRule Winn 1947 1949 - Sep lastSun 2:00 0 S 113214343SwollmanRule Winn 1950 only - May 1 2:00 1:00 D 113314343SwollmanRule Winn 1950 only - Sep 30 2:00 0 S 113414343SwollmanRule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 113514343SwollmanRule Winn 1951 1958 - Sep lastSun 2:00 0 S 11362742SwollmanRule Winn 1959 only - Oct lastSun 2:00 0 S 11372742SwollmanRule Winn 1960 only - Sep lastSun 2:00 0 S 11382742SwollmanRule Winn 1963 only - Apr lastSun 2:00 1:00 D 113914343SwollmanRule Winn 1963 only - Sep 22 2:00 0 S 11402742SwollmanRule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 114167578SwollmanRule Winn 1966 1986 - Oct lastSun 2:00 0 S 11422742SwollmanRule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 114367578Swollman# From Paul Eggert (2000-10-02): 114467578Swollman# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 114567578Swollman# DST at 03:00 local time. For now, assume it started in 1987. 114667578SwollmanRule Winn 1987 max - Oct lastSun 2:00s 0 S 11472742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11482742SwollmanZone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 11492742Swollman -6:00 Winn C%sT 11502742Swollman 11518029Swollman 115217200Swollman# Saskatchewan 115317200Swollman 1154121098Swollman# From Mark Brader (2003-07-26): 1155121098Swollman# The first actual adoption of DST in Canada was at the municipal 1156121098Swollman# level. As the [Toronto] Star put it (1912-06-07), "While people 1157121098Swollman# elsewhere have long been talking of legislation to save daylight, 1158121098Swollman# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1159121098Swollman# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1160121098Swollman# presumably late evening, as below), and would run until "the end of 1161121098Swollman# the summer". The discrepancy between municipal time and railroad 1162121098Swollman# time was noted. 1163121098Swollman 1164121098Swollman# From Paul Eggert (2003-07-27): 1165121098Swollman# Willett (1914-03) notes that DST "has been in operation ... in the 1166121098Swollman# City of Moose Jaw, Saskatchewan, for one year." 1167121098Swollman 116867578Swollman# From Paul Eggert (2000-10-02): 116917200Swollman# Shanks writes that since 1970 most of this region has been like Regina. 117017200Swollman# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 117117200Swollman# Other western towns (e.g. Lloydminster) are like Edmonton. 117267578Swollman# Matthews and Vincent (1998) write that Denare Beach and Creighton 117367578Swollman# are like Winnipeg, in violation of Saskatchewan law. 117417200Swollman 1175149514Swollman# From W. Jones (1992-11-06): 117617200Swollman# The. . .below is based on information I got from our law library, the 117717200Swollman# provincial archives, and the provincial Community Services department. 117817200Swollman# A precise history would require digging through newspaper archives, and 117917200Swollman# since you didn't say what you wanted, I didn't bother. 118017200Swollman# 118117200Swollman# Saskatchewan is split by a time zone meridian (105W) and over the years 118217200Swollman# the boundary became pretty ragged as communities near it reevaluated 118317200Swollman# their affiliations in one direction or the other. In 1965 a provincial 118417200Swollman# referendum favoured legislating common time practices. 118517200Swollman# 118617200Swollman# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 118717200Swollman# Saskatchewan 1978) was proclaimed, and established that the eastern 118817200Swollman# part of Saskatchewan would use CST year round, that districts in 118917200Swollman# northwest Saskatchewan would by default follow CST but could opt to 119017200Swollman# follow Mountain Time rules (thus 1 hour difference in the winter and 119117200Swollman# zero in the summer), and that districts in southwest Saskatchewan would 119217200Swollman# by default follow MT but could opt to follow CST. 119317200Swollman# 119417200Swollman# It took a few years for the dust to settle (I know one story of a town 119517200Swollman# on one time zone having its school in another, such that a mom had to 119617200Swollman# serve her family lunch in two shifts), but presently it seems that only 119717200Swollman# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 119817200Swollman# rules any more; all other districts appear to have used CST year round 119917200Swollman# since sometime in the 1960s. 120017200Swollman 12012742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12022742SwollmanRule Regina 1918 only - Apr 14 2:00 1:00 D 12032742SwollmanRule Regina 1918 only - Oct 31 2:00 0 S 12042742SwollmanRule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 12052742SwollmanRule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 12062742SwollmanRule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 12072742SwollmanRule Regina 1937 only - Oct Sun>=8 0:00 0 S 12082742SwollmanRule Regina 1938 only - Oct Sun>=1 0:00 0 S 12092742SwollmanRule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1210121098SwollmanRule Regina 1942 only - Feb 9 2:00 1:00 W # War 1211121098SwollmanRule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 12122742SwollmanRule Regina 1945 only - Sep lastSun 2:00 0 S 121317200SwollmanRule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 121417200SwollmanRule Regina 1946 only - Oct Sun>=8 2:00 0 S 1215121098SwollmanRule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1216121098SwollmanRule Regina 1947 1957 - Sep lastSun 2:00 0 S 1217121098SwollmanRule Regina 1959 only - Apr lastSun 2:00 1:00 D 121817200SwollmanRule Regina 1959 only - Oct lastSun 2:00 0 S 121917200Swollman# 122017200SwollmanRule Swift 1957 only - Apr lastSun 2:00 1:00 D 122117200SwollmanRule Swift 1957 only - Oct lastSun 2:00 0 S 122217200SwollmanRule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 122317200SwollmanRule Swift 1959 only - Oct lastSun 2:00 0 S 122417200SwollmanRule Swift 1960 1961 - Sep lastSun 2:00 0 S 12252742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 122617200SwollmanZone America/Regina -6:58:36 - LMT 1905 Sep 122717200Swollman -7:00 Regina M%sT 1960 Apr lastSun 2:00 12282742Swollman -6:00 - CST 122917200SwollmanZone America/Swift_Current -7:11:20 - LMT 1905 Sep 123017200Swollman -7:00 Canada M%sT 1946 Apr lastSun 2:00 123117200Swollman -7:00 Regina M%sT 1950 123217200Swollman -7:00 Swift M%sT 1972 Apr lastSun 2:00 123317200Swollman -6:00 - CST 12342742Swollman 12358029Swollman 123617200Swollman# Alberta 123717200Swollman 12382742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12392742SwollmanRule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 12402742SwollmanRule Edm 1918 only - Oct 31 2:00 0 S 12412742SwollmanRule Edm 1919 only - May 27 2:00 0 S 12422742SwollmanRule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 12432742SwollmanRule Edm 1920 only - Oct lastSun 2:00 0 S 12442742SwollmanRule Edm 1921 1923 - Sep lastSun 2:00 0 S 1245121098SwollmanRule Edm 1942 only - Feb 9 2:00 1:00 W # War 1246121098SwollmanRule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 12472742SwollmanRule Edm 1945 only - Sep lastSun 2:00 0 S 12482742SwollmanRule Edm 1947 only - Apr lastSun 2:00 1:00 D 12492742SwollmanRule Edm 1947 only - Sep lastSun 2:00 0 S 12502742SwollmanRule Edm 1967 only - Apr lastSun 2:00 1:00 D 12512742SwollmanRule Edm 1967 only - Oct lastSun 2:00 0 S 12522742SwollmanRule Edm 1969 only - Apr lastSun 2:00 1:00 D 12532742SwollmanRule Edm 1969 only - Oct lastSun 2:00 0 S 12542742SwollmanRule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 12552742SwollmanRule Edm 1972 max - Oct lastSun 2:00 0 S 12562742SwollmanRule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 12572742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12582742SwollmanZone America/Edmonton -7:33:52 - LMT 1906 Sep 12592742Swollman -7:00 Edm M%sT 12602742Swollman 12618029Swollman 126217200Swollman# British Columbia 126317200Swollman 126467578Swollman# From Paul Eggert (2000-10-02): 126517200Swollman# Shanks writes that since 1970 most of this region has been like Vancouver. 126658787Sru# Dawson Creek uses MST. Much of east BC is like Edmonton. 126767578Swollman# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 126817200Swollman 12692742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12702742SwollmanRule Vanc 1918 only - Apr 14 2:00 1:00 D 12712742SwollmanRule Vanc 1918 only - Oct 31 2:00 0 S 1272121098SwollmanRule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1273121098SwollmanRule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 12742742SwollmanRule Vanc 1945 only - Sep 30 2:00 0 S 12752742SwollmanRule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 12762742SwollmanRule Vanc 1946 only - Oct 13 2:00 0 S 12772742SwollmanRule Vanc 1947 1961 - Sep lastSun 2:00 0 S 12782742SwollmanRule Vanc 1962 max - Oct lastSun 2:00 0 S 12792742SwollmanRule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 12802742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12812742SwollmanZone America/Vancouver -8:12:28 - LMT 1884 12822742Swollman -8:00 Vanc P%sT 128317200SwollmanZone America/Dawson_Creek -8:00:56 - LMT 1884 128417200Swollman -8:00 Canada P%sT 1947 128517200Swollman -8:00 Vanc P%sT 1972 Aug 30 2:00 128617200Swollman -7:00 - MST 12872742Swollman 12888029Swollman 128958787Sru# Northwest Territories, Nunavut, Yukon 129017200Swollman 129158787Sru# From Paul Eggert (1999-10-29): 129217200Swollman# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1293149514Swollman# Mathew Englander (1996-10-07) gives the following refs: 129420094Swollman# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 129520094Swollman# c. 7 defines Yukon standard time as UTC-9. This is still valid; 129620094Swollman# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 129720094Swollman# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 129820094Swollman# * O.I.C. 1980/02 established DST. 129920094Swollman# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 130020094Swollman# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 130117200Swollman 130258787Sru# From Rives McDow (1999-09-04): 130358787Sru# Nunavut ... moved ... to incorporate the whole territory into one time zone. 130458787Sru# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 130558787Sru# Nunavut moves to single time zone Oct. 31 130658787Sru# </a> 130758787Sru# 130858787Sru# From Antoine Leca (1999-09-06): 130958787Sru# We then need to create a new timezone for the Kitikmeot region of Nunavut 131058787Sru# to differentiate it from the Yellowknife region. 131158787Sru 131258787Sru# From Paul Eggert (1999-09-20): 131358787Sru# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 131458787Sru# Basic Facts: The New Territory 131586222Swollman# </a> (1999) reports that Pangnirtung operates on eastern time, 131658787Sru# and that Coral Harbour does not observe DST. We don't know when 131786222Swollman# Pangnirtung switched to eastern time; we'll guess 1995. 131858787Sru 131958787Sru# From Rives McDow (1999-11-08): 132058787Sru# On October 31, when the rest of Nunavut went to Central time, 132158787Sru# Pangnirtung wobbled. Here is the result of their wobble: 132258787Sru# 132358787Sru# The following businesses and organizations in Pangnirtung use Central Time: 132458787Sru# 132558787Sru# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 132658787Sru# Eastern Arctic National Parks, A & D Specialist 132758787Sru# 132858787Sru# The following businesses and organizations in Pangnirtung use Eastern Time: 132958787Sru# 133058787Sru# Hamlet office, All other businesses, Both schools, Airport operator 133158787Sru# 133258787Sru# This has made for an interesting situation there, which warranted the news. 133358787Sru# No one there that I spoke with seems concerned, or has plans to 133458787Sru# change the local methods of keeping time, as it evidently does not 133558787Sru# really interfere with any activities or make things difficult locally. 133658787Sru# They plan to celebrate New Year's turn-over twice, one hour apart, 133758787Sru# so it appears that the situation will last at least that long. 133858787Sru# The Nunavut Intergovernmental Affairs hopes that they will "come to 133958787Sru# their senses", but the locals evidently don't see any problem with 134058787Sru# the current state of affairs. 134158787Sru 134258787Sru# From Michaela Rodrigue, writing in the 134358787Sru# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 134458787Sru# Nunatsiaq News (1999-11-19)</a>: 134558787Sru# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 134658787Sru# central - or Nunavut time - for government offices, and eastern time 134758787Sru# for municipal offices and schools.... Igloolik [was similar but then] 134858787Sru# made the switch to central time on Saturday, Nov. 6. 134958787Sru 135067578Swollman# From Paul Eggert (2000-10-02): 135167578Swollman# Matthews and Vincent (1998) say the following, but we lack histories 135267578Swollman# for these potential new Zones. 135375267Swollman# 135467578Swollman# The Canadian Forces station at Alert uses Eastern Time while the 135567578Swollman# handful of residents at the Eureka weather station [in the Central 135667578Swollman# zone] skip daylight savings. Baffin Island, which is crossed by the 135767578Swollman# Central, Eastern and Atlantic Time zones only uses Eastern Time. 135867578Swollman# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 135967578Swollman# Central Time and Southampton Island [in the Central zone] is not 136067578Swollman# required to use daylight savings. 136167578Swollman 136275267Swollman# From 136375267Swollman# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 136475267Swollman# Nunavut now has two time zones 136575267Swollman# </a> (2000-11-10): 136675267Swollman# The Nunavut government would allow its employees in Kugluktuk and 136775267Swollman# Cambridge Bay to operate on central time year-round, putting them 136875267Swollman# one hour behind the rest of Nunavut for six months during the winter. 136975267Swollman# At the end of October the two communities had rebelled against 137075267Swollman# Nunavut's unified time zone, refusing to shift to eastern time with 137175267Swollman# the rest of the territory for the winter. Cambridge Bay remained on 137275267Swollman# central time, while Kugluktuk, even farther west, reverted to 137375267Swollman# mountain time, which they had used before the advent of Nunavut's 137475267Swollman# unified time zone in 1999. 137575267Swollman# 137675267Swollman# From Rives McDow (2001-01-20), quoting the Nunavut government: 137775267Swollman# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 137875267Swollman 137975267Swollman# From Paul Eggert (2000-12-04): 138075267Swollman# Let's just keep track of the official times for now. 138175267Swollman 138275267Swollman# From Rives McDow (2001-03-07): 138375267Swollman# The premier of Nunavut has issued a ministerial statement advising 138475267Swollman# that effective 2001-04-01, the territory of Nunavut will revert 138575267Swollman# back to three time zones (mountain, central, and eastern). Of the 138675267Swollman# cities in Nunavut, Coral Harbor is the only one that I know of that 138775267Swollman# has said it will not observe dst, staying on EST year round. I'm 138875267Swollman# checking for more info, and will get back to you if I come up with 138975267Swollman# more. 139075267Swollman# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 139175267Swollman 1392149514Swollman# From Gwillim Law (2005-05-21): 1393149514Swollman# According to maps at 1394149514Swollman# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg 1395149514Swollman# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg 1396149514Swollman# (both dated 2003), and 1397149514Swollman# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 1398149514Swollman# (from a 1998 Canadian Geographic article), the de facto and de jure time 1399149514Swollman# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 1400149514Swollman# round. Using Google, it's easy to find other websites that confirm this. 1401149514Swollman# I wasn't able to find how far back this time regimen goes, but since it 1402149514Swollman# predates the creation of Nunavut, it probably goes back many years.... 1403149514Swollman# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 1404149514Swollman# 1405149514Swollman# From Paul Eggert (2005-07-26): 1406149514Swollman# For lack of better information, assume that Southampton Island observed 1407149514Swollman# daylight saving only during wartime. 1408149514Swollman 14092742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 141017200SwollmanRule NT_YK 1918 only - Apr 14 2:00 1:00 D 141117200SwollmanRule NT_YK 1918 only - Oct 27 2:00 0 S 141217200SwollmanRule NT_YK 1919 only - May 25 2:00 1:00 D 141317200SwollmanRule NT_YK 1919 only - Nov 1 0:00 0 S 1414121098SwollmanRule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 1415121098SwollmanRule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 141617200SwollmanRule NT_YK 1945 only - Sep 30 2:00 0 S 141717200SwollmanRule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 141817200SwollmanRule NT_YK 1965 only - Oct lastSun 2:00 0 S 141917200SwollmanRule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 142017200SwollmanRule NT_YK 1980 max - Oct lastSun 2:00 0 S 142117200SwollmanRule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 14222742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 142317200SwollmanZone America/Pangnirtung -4:22:56 - LMT 1884 142458787Sru -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 142558787Sru -5:00 Canada E%sT 1999 Oct 31 2:00 142675267Swollman -6:00 Canada C%sT 2000 Oct 29 2:00 142775267Swollman -5:00 Canada E%sT 142858787SruZone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 142958787Sru -5:00 NT_YK E%sT 1999 Oct 31 2:00 143075267Swollman -6:00 Canada C%sT 2000 Oct 29 2:00 143175267Swollman -5:00 Canada E%sT 1432149514SwollmanZone America/Coral_Harbour -5:32:40 - LMT 1884 1433149514Swollman -5:00 NT_YK E%sT 1946 1434149514Swollman -5:00 - EST 143575267SwollmanZone America/Rankin_Inlet -6:08:40 - LMT 1884 143675267Swollman -6:00 NT_YK C%sT 2000 Oct 29 2:00 143775267Swollman -5:00 - EST 2001 Apr 1 3:00 143858787Sru -6:00 Canada C%sT 143958787SruZone America/Cambridge_Bay -7:00:20 - LMT 1884 144058787Sru -7:00 NT_YK M%sT 1999 Oct 31 2:00 144175267Swollman -6:00 Canada C%sT 2000 Oct 29 2:00 144275267Swollman -5:00 - EST 2000 Nov 5 0:00 144375267Swollman -6:00 - CST 2001 Apr 1 3:00 144475267Swollman -7:00 Canada M%sT 144517200SwollmanZone America/Yellowknife -7:37:24 - LMT 1884 144617200Swollman -7:00 NT_YK M%sT 144717200SwollmanZone America/Inuvik -8:54:00 - LMT 1884 144817200Swollman -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 144917200Swollman -7:00 NT_YK M%sT 14502742SwollmanZone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 145117200Swollman -9:00 NT_YK Y%sT 1966 Jul 1 2:00 145217200Swollman -8:00 NT_YK P%sT 145317200SwollmanZone America/Dawson -9:17:40 - LMT 1900 Aug 20 145420094Swollman -9:00 NT_YK Y%sT 1973 Oct 28 0:00 145517200Swollman -8:00 NT_YK P%sT 14562742Swollman 14578029Swollman 14582742Swollman############################################################################### 14592742Swollman 14602742Swollman# Mexico 14612742Swollman 146275267Swollman# From Paul Eggert (2001-03-05): 146375267Swollman# The Investigation and Analysis Service of the 146475267Swollman# Mexican Library of Congress (MLoC) has published a 146575267Swollman# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 146675267Swollman# history of Mexican local time (in Spanish) 146775267Swollman# </a>. 14682742Swollman# 146975267Swollman# Here are the discrepancies between Shanks and the MLoC. 147075267Swollman# (In all cases we go with the MLoC.) 147175267Swollman# Shanks reports that Baja was at -8:00 in 1922/1923. 147275267Swollman# Shanks says the 1930 transition in Baja was 1930-11-16. 147375267Swollman# Shanks reports no DST during summer 1931. 1474149514Swollman# Shanks reports a transition at 1932-03-30 23:00, not 1932-04-01. 147575267Swollman# Shanks does not report transitions for Baja in 1945 or 1948. 147675267Swollman# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 147775267Swollman# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 147875267Swollman# on 1997-10-26 at 02:00. 14792742Swollman 148075267Swollman# From Gwillim Law (2001-02-20): 148175267Swollman# There are some other discrepancies between the Decrees page and the 148275267Swollman# tz database. I think they can best be explained by supposing that 148375267Swollman# the researchers who prepared the Decrees page failed to find some of 148475267Swollman# the relevant documents. 148575267Swollman 148664499Swollman# From Paul Eggert (2000-07-26): 148764499Swollman# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 148864499Swollman# and 1988 DST experiments. Go with spin.com.mx. 14892742Swollman 1490149514Swollman# From Alan Perry (1996-02-15): 149117200Swollman# A guy from our Mexico subsidiary finally found the Presidential Decree 149217200Swollman# outlining the timezone changes in Mexico. 149358787Sru# 149417200Swollman# ------------- Begin Forwarded Message ------------- 149558787Sru# 149617200Swollman# I finally got my hands on the Official Presidential Decree that sets up the 149717200Swollman# rules for the DST changes. The rules are: 149858787Sru# 149917200Swollman# 1. The country is divided in 3 timezones: 150017200Swollman# - Baja California Norte (the Mexico/BajaNorte TZ) 150117200Swollman# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 150217200Swollman# - The rest of the country (the Mexico/General TZ) 150358787Sru# 150417200Swollman# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 150517200Swollman# at 2:00 AM, the times in each zone are as follows: 150617200Swollman# BajaNorte: GMT+7 150717200Swollman# BajaSur: GMT+6 150817200Swollman# General: GMT+5 150958787Sru# 151017200Swollman# 3. The rest of the year, the times are as follows: 151117200Swollman# BajaNorte: GMT+8 151217200Swollman# BajaSur: GMT+7 151317200Swollman# General: GMT+6 151458787Sru# 151517200Swollman# The Decree was published in Mexico's Official Newspaper on January 4th. 151658787Sru# 151717200Swollman# -------------- End Forwarded Message -------------- 151817200Swollman# From Paul Eggert (1996-06-12): 151943014Swollman# For an English translation of the decree, see 152043014Swollman# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 152143014Swollman# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 152243014Swollman# </a> 152314343Swollman 152443543Swollman# From Rives McDow (1998-10-08): 152543543Swollman# The State of Quintana Roo has reverted back to central STD and DST times 152643543Swollman# (i.e. UTC -0600 and -0500 as of 1998-08-02). 152743543Swollman 152858787Sru# From Rives McDow (2000-01-10): 152958787Sru# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 153058787Sru# zone 5 hours from the International Date Line, and will not observe daylight 153158787Sru# savings time so as to stay on the same time zone as the southern part of 153258787Sru# Arizona year round. 153358787Sru 153475267Swollman# From Jesper Norgaard, translating 153575267Swollman# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 153675267Swollman# In Oaxaca, the 55.000 teachers from the Section 22 of the National 153775267Swollman# Syndicate of Education Workers, refuse to apply daylight saving each 153875267Swollman# year, so that the more than 10,000 schools work at normal hour the 153975267Swollman# whole year. 154075267Swollman 154175267Swollman# From Gwillim Law (2001-01-19): 154275267Swollman# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 154375267Swollman# (translated):... 154475267Swollman# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 154575267Swollman# that Summer Time will be reduced from seven to five months, starting 154675267Swollman# this year.... 154775267Swollman# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 154875267Swollman# [translated], says "summer time will ... take effect on the first Sunday 154975267Swollman# in May, and end on the last Sunday of September. 155075267Swollman 155175267Swollman# From Arthur David Olson (2001-01-25): 155275267Swollman# The 2001-01-24 traditional Washington Post contained the page one 155375267Swollman# story "Timely Issue Divides Mexicans."... 155475267Swollman# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 155575267Swollman# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 155675267Swollman# Mexico City and its 20 million residents on a different time than 155775267Swollman# the rest of the country..." In particular, Lopez Obrador would abolish 155875267Swollman# observation of Daylight Saving Time. 155975267Swollman 156075267Swollman# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 156175267Swollman# Official statute published by the Energy Department 156275267Swollman# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 156375267Swollman# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 156475267Swollman 156575267Swollman# From Paul Eggert (2001-03-03): 156675267Swollman# 156775267Swollman# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 156875267Swollman# James F. Smith writes in today's LA Times 156975267Swollman# </a> 157075267Swollman# * Sonora will continue to observe standard time. 157175267Swollman# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 157275267Swollman# the Federal District will not adopt DST. 157375267Swollman# * 4 of 16 district leaders announced they'll ignore the decree. 157475267Swollman# * The decree does not affect federal-controlled facilities including 157575267Swollman# the airport, banks, hospitals, and schools. 157675267Swollman# 157775267Swollman# For now we'll assume that the Federal District will bow to federal rules. 157875267Swollman 157975267Swollman# From Jesper Norgaard (2001-04-01): 158075267Swollman# I found some references to the Mexican application of daylight 158175267Swollman# saving, which modifies what I had already sent you, stating earlier 158275267Swollman# that a number of northern Mexican states would go on daylight 158375267Swollman# saving. The modification reverts this to only cover Baja California 158475267Swollman# (Norte), while all other states (except Sonora, who has no daylight 158575267Swollman# saving all year) will follow the original decree of president 158675267Swollman# Vicente Fox, starting daylight saving May 6, 2001 and ending 158775267Swollman# September 30, 2001. 158875267Swollman# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 158975267Swollman# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 159075267Swollman 159186222Swollman# From Reuters (2001-09-04): 159286222Swollman# Mexico's Supreme Court on Tuesday declared that daylight savings was 159386222Swollman# unconstitutional in Mexico City, creating the possibility the 159486222Swollman# capital will be in a different time zone from the rest of the nation 159586222Swollman# next year.... The Supreme Court's ruling takes effect at 2:00 159686222Swollman# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 159786222Swollman# standard time. "This is so residents of the Federal District are not 159886222Swollman# subject to unexpected time changes," a statement from the court said. 159986222Swollman 160093799Swollman# From Jesper Norgaard Welen (2002-03-12): 160193799Swollman# ... consulting my local grocery store(!) and my coworkers, they all insisted 160293799Swollman# that a new decision had been made to reinstate US style DST in Mexico.... 160393799Swollman# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 160493799Swollman# confirms this. Sonora as usual is the only state where DST is not applied. 160593799Swollman 16062742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 16072742SwollmanRule Mexico 1939 only - Feb 5 0:00 1:00 D 16082742SwollmanRule Mexico 1939 only - Jun 25 0:00 0 S 16092742SwollmanRule Mexico 1940 only - Dec 9 0:00 1:00 D 16102742SwollmanRule Mexico 1941 only - Apr 1 0:00 0 S 1611121098SwollmanRule Mexico 1943 only - Dec 16 0:00 1:00 W # War 16122742SwollmanRule Mexico 1944 only - May 1 0:00 0 S 16132742SwollmanRule Mexico 1950 only - Feb 12 0:00 1:00 D 16142742SwollmanRule Mexico 1950 only - Jul 30 0:00 0 S 161575267SwollmanRule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 161675267SwollmanRule Mexico 1996 2000 - Oct lastSun 2:00 0 S 161793799SwollmanRule Mexico 2001 only - May Sun>=1 2:00 1:00 D 161893799SwollmanRule Mexico 2001 only - Sep lastSun 2:00 0 S 161993799SwollmanRule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 162093799SwollmanRule Mexico 2002 max - Oct lastSun 2:00 0 S 16212742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 162243014Swollman# Quintana Roo 162358787SruZone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 162475267Swollman -6:00 - CST 1981 Dec 23 162543543Swollman -5:00 Mexico E%sT 1998 Aug 2 2:00 162643543Swollman -6:00 Mexico C%sT 162764499Swollman# Campeche, Yucatan 162864499SwollmanZone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 162975267Swollman -6:00 - CST 1981 Dec 23 163064499Swollman -5:00 - EST 1982 Dec 2 163164499Swollman -6:00 Mexico C%sT 163264499Swollman# Coahuila, Durango, Nuevo Leon, Tamaulipas 163375267SwollmanZone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 163464499Swollman -6:00 - CST 1988 163564499Swollman -6:00 US C%sT 1989 163664499Swollman -6:00 Mexico C%sT 163743014Swollman# Central Mexico 16382742SwollmanZone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 16392742Swollman -7:00 - MST 1927 Jun 10 23:00 16402742Swollman -6:00 - CST 1930 Nov 15 16412742Swollman -7:00 - MST 1931 May 1 23:00 16422742Swollman -6:00 - CST 1931 Oct 164375267Swollman -7:00 - MST 1932 Apr 1 164486222Swollman -6:00 Mexico C%sT 2001 Sep 30 02:00 164593799Swollman -6:00 - CST 2002 Feb 20 164693799Swollman -6:00 Mexico C%sT 164743014Swollman# Chihuahua 164858787SruZone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 164943014Swollman -7:00 - MST 1927 Jun 10 23:00 165043014Swollman -6:00 - CST 1930 Nov 15 165143014Swollman -7:00 - MST 1931 May 1 23:00 165243014Swollman -6:00 - CST 1931 Oct 165375267Swollman -7:00 - MST 1932 Apr 1 165443014Swollman -6:00 - CST 1996 165543014Swollman -6:00 Mexico C%sT 1998 165643014Swollman -6:00 - CST 1998 Apr Sun>=1 3:00 165743014Swollman -7:00 Mexico M%sT 165858787Sru# Sonora 165958787SruZone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 166058787Sru -7:00 - MST 1927 Jun 10 23:00 166158787Sru -6:00 - CST 1930 Nov 15 166258787Sru -7:00 - MST 1931 May 1 23:00 166358787Sru -6:00 - CST 1931 Oct 166475267Swollman -7:00 - MST 1932 Apr 1 166564499Swollman -6:00 - CST 1942 Apr 24 166658787Sru -7:00 - MST 1949 Jan 14 166758787Sru -8:00 - PST 1970 166858787Sru -7:00 Mexico M%sT 1999 166958787Sru -7:00 - MST 167064499Swollman# Baja California Sur, Nayarit, Sinaloa 16712742SwollmanZone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 16722742Swollman -7:00 - MST 1927 Jun 10 23:00 16732742Swollman -6:00 - CST 1930 Nov 15 16742742Swollman -7:00 - MST 1931 May 1 23:00 16752742Swollman -6:00 - CST 1931 Oct 167675267Swollman -7:00 - MST 1932 Apr 1 167764499Swollman -6:00 - CST 1942 Apr 24 16782742Swollman -7:00 - MST 1949 Jan 14 16792742Swollman -8:00 - PST 1970 168014343Swollman -7:00 Mexico M%sT 168158787Sru# Baja California 16822742SwollmanZone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 168375267Swollman -7:00 - MST 1924 16842742Swollman -8:00 - PST 1927 Jun 10 23:00 168575267Swollman -7:00 - MST 1930 Nov 15 168675267Swollman -8:00 - PST 1931 Apr 1 168775267Swollman -8:00 1:00 PDT 1931 Sep 30 168864499Swollman -8:00 - PST 1942 Apr 24 168975267Swollman -8:00 1:00 PWT 1945 Nov 12 169075267Swollman -8:00 - PST 1948 Apr 5 169175267Swollman -8:00 1:00 PDT 1949 Jan 14 169275267Swollman -8:00 - PST 1954 169375267Swollman -8:00 CA P%sT 1961 169475267Swollman -8:00 - PST 1976 169514343Swollman -8:00 US P%sT 1996 169675267Swollman -8:00 Mexico P%sT 2001 169793799Swollman -8:00 US P%sT 2002 Feb 20 169893799Swollman -8:00 Mexico P%sT 169975267Swollman# From Paul Eggert (2001-03-05): 170075267Swollman# Formerly there was an America/Ensenada zone, which differed from 170175267Swollman# America/Tijuana only in that it did not observe DST from 1976 170275267Swollman# through 1995. This was as per Shanks. However, Guy Harris reports 170375267Swollman# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 170475267Swollman# Tijuana observe DST," which contradicts Shanks but does imply that 170575267Swollman# DST-observance was a town-by-town matter back then. This concerns 170675267Swollman# data after 1970 so most likely there should be at least one Zone 170775267Swollman# other than America/Tijuana for Baja, but it's not clear yet what its 170875267Swollman# name or contents should be. 17092742Swollman# 17102742Swollman# Revillagigedo Is 17112742Swollman# no information 17122742Swollman 17132742Swollman############################################################################### 17142742Swollman 17152742Swollman# Anguilla 17162742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17172742SwollmanZone America/Anguilla -4:12:16 - LMT 1912 Mar 2 17182742Swollman -4:00 - AST 17192742Swollman 17202742Swollman# Antigua and Barbuda 17212742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17222742SwollmanZone America/Antigua -4:07:12 - LMT 1912 Mar 2 17232742Swollman -5:00 - EST 1951 17242742Swollman -4:00 - AST 17252742Swollman 17262742Swollman# Bahamas 17272742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 17282742SwollmanRule Bahamas 1964 max - Oct lastSun 2:00 0 S 17292742SwollmanRule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 17302742SwollmanRule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 17312742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17322742SwollmanZone America/Nassau -5:09:24 - LMT 1912 Mar 2 17332742Swollman -5:00 Bahamas E%sT 17342742Swollman 17352742Swollman# Barbados 17362742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 17372742SwollmanRule Barb 1977 only - Jun 12 2:00 1:00 D 17382742SwollmanRule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 17392742SwollmanRule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 17402742SwollmanRule Barb 1979 only - Sep 30 2:00 0 S 17412742SwollmanRule Barb 1980 only - Sep 25 2:00 0 S 17422742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17432742SwollmanZone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 174443014Swollman -3:58:28 - BMT 1932 # Bridgetown Mean Time 17452742Swollman -4:00 Barb A%sT 17462742Swollman 17472742Swollman# Belize 17482742Swollman# Whitman entirely disagrees with Shanks; go with Shanks. 17492742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 17502742SwollmanRule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 17512742SwollmanRule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 17522742SwollmanRule Belize 1973 only - Dec 5 0:00 1:00 D 17532742SwollmanRule Belize 1974 only - Feb 9 0:00 0 S 17542742SwollmanRule Belize 1982 only - Dec 18 0:00 1:00 D 17552742SwollmanRule Belize 1983 only - Feb 12 0:00 0 S 17562742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17572742SwollmanZone America/Belize -5:52:48 - LMT 1912 Apr 17582742Swollman -6:00 Belize C%sT 17592742Swollman 17602742Swollman# Bermuda 17612742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17622742SwollmanZone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 17632742Swollman -4:00 - AST 1974 Apr 28 2:00 17642742Swollman -4:00 Bahamas A%sT 17652742Swollman 17662742Swollman# Cayman Is 17672742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17682742SwollmanZone America/Cayman -5:25:32 - LMT 1890 # Georgetown 176943014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 17702742Swollman -5:00 - EST 17712742Swollman 17722742Swollman# Costa Rica 17732742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 17742742SwollmanRule CR 1979 1980 - Feb lastSun 0:00 1:00 D 17752742SwollmanRule CR 1979 1980 - Jun Sun>=1 0:00 0 S 177620094SwollmanRule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 177720094Swollman# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 177820094SwollmanRule CR 1991 only - Jul 1 0:00 0 S 177920094SwollmanRule CR 1992 only - Mar 15 0:00 0 S 17802742Swollman# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 17812742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17822742SwollmanZone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 178358787Sru -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 17842742Swollman -6:00 CR C%sT 17852742Swollman# Coco 17862742Swollman# no information; probably like America/Costa_Rica 17872742Swollman 17882742Swollman# Cuba 17892742Swollman 179058787Sru# From Arthur David Olson (1999-03-29): 179158787Sru# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 179258787Sru# the Cuban National Team and the Baltimore Orioles was carried live on 179358787Sru# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 179458787Sru# During the game, play-by-play announcer Jim Hunter noted that 179558787Sru# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 179658787Sru# Time today." (The "two hour" remark referred to losing one hour of 179758787Sru# sleep on 1999-03-28--when the announcers were in Cuba as it switched 179858787Sru# to DST--and one more hour on 1999-04-04--when the announcers will have 179958787Sru# returned to Baltimore, which switches on that date.) 18002742Swollman 1801138323Swollman# From Evert van der Veer via Steffen Thorsen (2004-10-28): 1802138323Swollman# Cuba is not going back to standard time this year. 1803138323Swollman# From Paul Eggert (2004-10-28): 1804138323Swollman# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 1805138323Swollman# says that it's due to a problem at the Antonio Guiteras 1806138323Swollman# thermoelectric plant, and says "This October there will be no return 1807138323Swollman# to normal hours (after daylight saving time)". 1808138323Swollman# For now, let's assume that it's a one-year temporary measure. 1809138323Swollman 18102742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 18112742SwollmanRule Cuba 1928 only - Jun 10 0:00 1:00 D 18122742SwollmanRule Cuba 1928 only - Oct 10 0:00 0 S 18132742SwollmanRule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 18142742SwollmanRule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 18152742SwollmanRule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 18162742SwollmanRule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 18172742SwollmanRule Cuba 1965 only - Jun 1 0:00 1:00 D 18182742SwollmanRule Cuba 1965 only - Sep 30 0:00 0 S 18192742SwollmanRule Cuba 1966 only - May 29 0:00 1:00 D 18202742SwollmanRule Cuba 1966 only - Oct 2 0:00 0 S 18212742SwollmanRule Cuba 1967 only - Apr 8 0:00 1:00 D 18222742SwollmanRule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 18232742SwollmanRule Cuba 1968 only - Apr 14 0:00 1:00 D 18242742SwollmanRule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 18252742SwollmanRule Cuba 1969 1971 - Oct lastSun 0:00 0 S 18262742SwollmanRule Cuba 1972 1974 - Oct 8 0:00 0 S 18272742SwollmanRule Cuba 1975 1977 - Oct lastSun 0:00 0 S 18282742SwollmanRule Cuba 1978 only - May 7 0:00 1:00 D 182930711SwollmanRule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 18302742SwollmanRule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 18312742SwollmanRule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 18322742SwollmanRule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 183343014SwollmanRule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 183420094SwollmanRule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 183543014SwollmanRule Cuba 1996 only - Oct 6 0:00s 0 S 183643014SwollmanRule Cuba 1997 only - Oct 12 0:00s 0 S 183758787SruRule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1838138323SwollmanRule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 183958787SruRule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1840138323SwollmanRule Cuba 2005 max - Oct lastSun 0:00s 0 S 18412742Swollman 18422742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 18432742SwollmanZone America/Havana -5:29:28 - LMT 1890 184458787Sru -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 18452742Swollman -5:00 Cuba C%sT 18462742Swollman 18472742Swollman# Dominica 18482742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 18492742SwollmanZone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 18502742Swollman -4:00 - AST 18512742Swollman 18522742Swollman# Dominican Republic 185375267Swollman 185475267Swollman# From Steffen Thorsen (2000-10-30): 185575267Swollman# Enrique Morales reported to me that the Dominican Republic has changed the 185675267Swollman# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 185775267Swollman# http://www.listin.com.do/antes/261000/republica/princi.html 185875267Swollman 185975267Swollman# From Paul Eggert (2000-12-04): 186075267Swollman# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 186175267Swollman 186275267Swollman# From Rives McDow (2000-12-01): 186375267Swollman# Dominican Republic changed its mind and presidential decree on Tuesday, 186475267Swollman# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 186575267Swollman# Dominican Republic will be reverting to 8 hours from the International Date 186675267Swollman# Line, and will not be using DST in the foreseeable future. The reason they 186775267Swollman# decided to use DST was to be in synch with Puerto Rico, who was also going 186875267Swollman# to implement DST. When Puerto Rico didn't implement DST, the president 186975267Swollman# decided to revert. 187075267Swollman 187175267Swollman 18722742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 18732742SwollmanRule DR 1966 only - Oct 30 0:00 1:00 D 18742742SwollmanRule DR 1967 only - Feb 28 0:00 0 S 18752742SwollmanRule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 18762742SwollmanRule DR 1970 only - Feb 21 0:00 0 S 18772742SwollmanRule DR 1971 only - Jan 20 0:00 0 S 18782742SwollmanRule DR 1972 1974 - Jan 21 0:00 0 S 18792742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 18802742SwollmanZone America/Santo_Domingo -4:39:36 - LMT 1890 18812742Swollman -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 18822742Swollman -5:00 DR E%sT 1974 Oct 27 188375267Swollman -4:00 - AST 2000 Oct 29 02:00 188475267Swollman -5:00 US E%sT 2000 Dec 3 01:00 18852742Swollman -4:00 - AST 18862742Swollman 18872742Swollman# El Salvador 18882742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 18892742SwollmanRule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 18902742SwollmanRule Salv 1987 1988 - Sep lastSun 0:00 0 S 1891121098Swollman# There are too many San Salvadors elsewhere, so use America/El_Salvador 1892121098Swollman# instead of America/San_Salvador. 18932742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 18942742SwollmanZone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 18952742Swollman -6:00 Salv C%sT 18962742Swollman 18972742Swollman# Grenada 18982742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 189919878SwollmanZone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 19002742Swollman -4:00 - AST 19012742Swollman 19022742Swollman# Guadeloupe 19032742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19042742SwollmanZone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 19052742Swollman -4:00 - AST 19062742Swollman 19072742Swollman# Guatemala 19082742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 19092742SwollmanRule Guat 1973 only - Nov 25 0:00 1:00 D 19102742SwollmanRule Guat 1974 only - Feb 24 0:00 0 S 19112742SwollmanRule Guat 1983 only - May 21 0:00 1:00 D 19122742SwollmanRule Guat 1983 only - Sep 22 0:00 0 S 191320094SwollmanRule Guat 1991 only - Mar 23 0:00 1:00 D 191420094SwollmanRule Guat 1991 only - Sep 7 0:00 0 S 19152742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19162742SwollmanZone America/Guatemala -6:02:04 - LMT 1918 Oct 5 19172742Swollman -6:00 Guat C%sT 19182742Swollman 19192742Swollman# Haiti 1920149514Swollman# From Gwillim Law (2005-04-15): 1921149514Swollman# Risto O. Nykanen wrote me that Haiti is now on DST. 1922149514Swollman# I searched for confirmation, and I found a 1923149514Swollman# <a href="http://www.haitianconsulate.org/time.doc"> press release 1924149514Swollman# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 1925149514Swollman# </a>. Translated from French, it says: 1926149514Swollman# 1927149514Swollman# "The Prime Minister's Communication Office notifies the public in general 1928149514Swollman# and the press in particular that, following a decision of the Interior 1929149514Swollman# Ministry and the Territorial Collectivities [I suppose that means the 1930149514Swollman# provinces], Haiti will move to Eastern Daylight Time in the night from next 1931149514Swollman# Saturday the 2nd to Sunday the 3rd. 1932149514Swollman# 1933149514Swollman# "Consequently, the Prime Minister's Communication Office wishes to inform 1934149514Swollman# the population that the country's clocks will be set forward one hour 1935149514Swollman# starting at midnight. This provision will hold until the last Saturday in 1936149514Swollman# October 2005. 1937149514Swollman# 1938149514Swollman# "Port-au-Prince, March 31, 2005" 1939149514Swollman 19402742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 19412742SwollmanRule Haiti 1983 only - May 8 0:00 1:00 D 19422742SwollmanRule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 19432742SwollmanRule Haiti 1983 1987 - Oct lastSun 0:00 0 S 194458787Sru# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 194543014SwollmanRule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 194643014SwollmanRule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 1947149514SwollmanRule Haiti 2005 only - Apr Sun>=1 0:00 1:00 D 1948149514SwollmanRule Haiti 2005 only - Oct lastSun 0:00 0 S 19492742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19502742SwollmanZone America/Port-au-Prince -4:49:20 - LMT 1890 19512742Swollman -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 19522742Swollman -5:00 Haiti E%sT 19532742Swollman 19542742Swollman# Honduras 19552742Swollman# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 19562742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19572742SwollmanZone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 19582742Swollman -6:00 Salv C%sT 195943543Swollman# 196043543Swollman# Great Swan I ceded by US to Honduras in 1972 19612742Swollman 19622742Swollman# Jamaica 19632742Swollman 196419878Swollman# From Bob Devine (1988-01-28): 19652742Swollman# Follows US rules. 19662742Swollman 196719878Swollman# From U. S. Naval Observatory (1989-01-19): 19682742Swollman# JAMAICA 5 H BEHIND UTC 19692742Swollman 197058787Sru# From Shanks: 19712742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19722742SwollmanZone America/Jamaica -5:07:12 - LMT 1890 # Kingston 197343014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 197458787Sru -5:00 - EST 1974 Apr 28 2:00 197520094Swollman -5:00 US E%sT 1984 197620094Swollman -5:00 - EST 19772742Swollman 19782742Swollman# Martinique 19792742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19802742SwollmanZone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 198186222Swollman -4:04:20 - FFMT 1911 May # Fort-de-France MT 19822742Swollman -4:00 - AST 1980 Apr 6 19832742Swollman -4:00 1:00 ADT 1980 Sep 28 19842742Swollman -4:00 - AST 19852742Swollman 19862742Swollman# Montserrat 198730711Swollman# From Paul Eggert (1997-08-31): 198830711Swollman# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 198930711Swollman# Luckily, Olveston, the current de facto capital, has the same longitude. 19902742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 199130711SwollmanZone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 19922742Swollman -4:00 - AST 19932742Swollman 19942742Swollman# Nicaragua 199543543Swollman# 199643543Swollman# From Steffen Thorsen (1998-12-29): 199743543Swollman# Nicaragua seems to be back at -6:00 but I have not been able to find when 199843543Swollman# they changed from -5:00. 199943543Swollman# 2000149514Swollman# From Steffen Thorsen (2005-04-12): 2001149514Swollman# I've got reports from 8 different people that Nicaragua just started 2002149514Swollman# DST on Sunday 2005-04-10, in order to save energy because of 2003149514Swollman# expensive petroleum. The exact end date for DST is not yet 2004149514Swollman# announced, only "September" but some sites also say "mid-September". 2005149514Swollman# Some background information is available on the President's official site: 2006149514Swollman# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 2007149514Swollman# The Decree, no 23-2005 is available here: 2008149514Swollman# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf 2009149514Swollman# 2010149514Swollman# From Paul Eggert (2005-05-01): 2011149514Swollman# The decree doesn't say anything about daylight saving, but for now let's 2012149514Swollman# assume that it is daylight saving and that they'll switch back on the 2013149514Swollman# 3rd Sunday in September. 2014149514Swollman# 2015149514Swollman# From Gwillim Law (2005-04-21): 2016149514Swollman# The Associated Press story on the time change, which can be found at 2017149514Swollman# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 2018149514Swollman# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 2019149514Swollman# time that a change of clocks was applied to save energy was in the year 2000 2020149514Swollman# during the Arnoldo Aleman administration."... 2021149514Swollman# The northamerica file says that Nicaragua has been on UTC-6 continuously 2022149514Swollman# since December 1998. I wasn't able to find any details of Nicaraguan time 2023149514Swollman# changes in 2000. Perhaps a note could be added to the northamerica file, to 2024149514Swollman# the effect that we have indirect evidence that DST was observed in 2000. 2025149514Swollman# 20262742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 20272742SwollmanRule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 20282742SwollmanRule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 202920094SwollmanRule Nic 1992 only - Jan 1 4:00 1:00 D 203020094SwollmanRule Nic 1992 only - Sep 24 0:00 0 S 2031149514SwollmanRule Nic 2005 only - Apr 10 0:00 1:00 D 2032149514SwollmanRule Nic 2005 only - Sep 18 0:00 0 S 20332742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 20342742SwollmanZone America/Managua -5:45:08 - LMT 1890 203586222Swollman -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 20362742Swollman -6:00 - CST 1973 May 20372742Swollman -5:00 - EST 1975 Feb 16 203820094Swollman -6:00 Nic C%sT 1993 Jan 1 4:00 203943543Swollman -5:00 - EST 1998 Dec 2040149514Swollman -6:00 Nic C%sT 20412742Swollman 20422742Swollman# Panama 20432742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 20442742SwollmanZone America/Panama -5:18:08 - LMT 1890 204586222Swollman -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 20462742Swollman -5:00 - EST 20472742Swollman 20482742Swollman# Puerto Rico 20492742Swollman# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 20502742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 205114343SwollmanZone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 20522742Swollman -4:00 - AST 1942 May 3 205314343Swollman -4:00 1:00 AWT 1945 Sep 30 2:00 20542742Swollman -4:00 - AST 20552742Swollman 20562742Swollman# St Kitts-Nevis 20572742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 20582742SwollmanZone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 20592742Swollman -4:00 - AST 20602742Swollman 20612742Swollman# St Lucia 20622742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 20632742SwollmanZone America/St_Lucia -4:04:00 - LMT 1890 # Castries 206486222Swollman -4:04:00 - CMT 1912 # Castries Mean Time 20652742Swollman -4:00 - AST 20662742Swollman 20672742Swollman# St Pierre and Miquelon 20682742Swollman# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 20692742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 20702742SwollmanZone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 20712742Swollman -4:00 - AST 1980 May 2072121098Swollman -3:00 - PMST 1987 # Pierre & Miquelon Time 2073121098Swollman -3:00 Canada PM%sT 20742742Swollman 20752742Swollman# St Vincent and the Grenadines 20762742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 20772742SwollmanZone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 207843014Swollman -4:04:56 - KMT 1912 # Kingstown Mean Time 20792742Swollman -4:00 - AST 20802742Swollman 20812742Swollman# Turks and Caicos 208243014Swollman# From Paul Eggert (1998-08-06): 208343014Swollman# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 208420094Swollman# says they switch at midnight. Go with IATA SSIM. 208520094Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 208620094SwollmanRule TC 1979 1986 - Apr lastSun 0:00 1:00 D 208720094SwollmanRule TC 1979 max - Oct lastSun 0:00 0 S 208820094SwollmanRule TC 1987 max - Apr Sun>=1 0:00 1:00 D 20892742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 20902742SwollmanZone America/Grand_Turk -4:44:32 - LMT 1890 209143014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 209220094Swollman -5:00 TC E%sT 20938029Swollman 209414343Swollman# British Virgin Is 20952742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 209614343SwollmanZone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 20972742Swollman -4:00 - AST 20988029Swollman 209914343Swollman# Virgin Is 210014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 210114343SwollmanZone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 210214343Swollman -4:00 - AST 2103