northamerica revision 64499
164499Swollman# @(#)northamerica 7.52 22742Swollman# also includes Central America and the Caribbean 32742Swollman 464499Swollman# $FreeBSD: head/share/zoneinfo/northamerica 64499 2000-08-10 19:36:46Z wollman $ 564499Swollman 62742Swollman# This data is by no means authoritative; if you think you know better, 72742Swollman# go ahead and edit the file (and please send any changes to 82742Swollman# tz@elsie.nci.nih.gov for general use in the future). 92742Swollman 1058787Sru# From Paul Eggert <eggert@twinsun.com> (1999-03-22): 112742Swollman# A reliable and entertaining source about time zones is 1258787Sru# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 132742Swollman 142742Swollman############################################################################### 152742Swollman 162742Swollman# United States 172742Swollman 1858787Sru# From Paul Eggert (1999-03-31): 1958787Sru# Howse writes (pp 121-125) that time zones were invented by 2058787Sru# Professor Charles Ferdinand Dowd (1825-1904), 2158787Sru# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 2258787Sru# His pamphlet ``A System of National Time for Railroads'' (1870) 2358787Sru# was the result of his proposals at the Convention of Railroad Trunk Lines 2458787Sru# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 2558787Sru# but in 1872-05 he moved the proposed origin to Greenwich. 2658787Sru# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 2758787Sru# and the most of the country soon followed suit. 2858787Sru 2914343Swollman# From Paul Eggert <eggert@twinsun.com> (1995-12-19): 3014343Swollman# A good source for time zone historical data in the US is 3114343Swollman# Thomas G. Shanks, The American Atlas (5th edition), 3214343Swollman# San Diego: ACS Publications, Inc. (1991). 3314343Swollman# Make sure you have the errata sheet; the book is somewhat useless without it. 3414343Swollman# It is the source for the US and Puerto Rico entries below. 3514343Swollman 3617200Swollman# From Paul Eggert (1996-06-12): 3717200Swollman# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 3817200Swollman# in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784). 3917200Swollman# Not everyone is happy with the results: 4017200Swollman# 4117200Swollman# I don't really care how time is reckoned so long as there is some 4217200Swollman# agreement about it, but I object to being told that I am saving 4317200Swollman# daylight when my reason tells me that I am doing nothing of the kind. 4417200Swollman# I even object to the implication that I am wasting something 4517200Swollman# valuable if I stay in bed after the sun has risen. As an admirer 4617200Swollman# of moonlight I resent the bossy insistence of those who want to 4717200Swollman# reduce my time for enjoying it. At the back of the Daylight Saving 4817200Swollman# scheme I detect the bony, blue-fingered hand of Puritanism, eager 4917200Swollman# to push people into bed earlier, and get them up earlier, to make 5017200Swollman# them healthy, wealthy and wise in spite of themselves. 5117200Swollman# 5217200Swollman# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 5317200Swollman 542742Swollman# From Arthur David Olson: 552742Swollman# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 5619878Swollman# See, for example, the front page of the Saturday, 1974-10-26 5719878Swollman# and Sunday, 1974-10-27 editions of the Washington Post. 582742Swollman 592742Swollman# From Arthur David Olson: 602742Swollman# Before the Uniform Time Act of 1966 took effect in 1967, observance of 612742Swollman# Daylight Saving Time in the US was by local option, except during wartime. 622742Swollman 632742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6414343SwollmanRule US 1918 1919 - Mar lastSun 2:00 1:00 W # War 652742SwollmanRule US 1918 1919 - Oct lastSun 2:00 0 S 662742SwollmanRule US 1942 only - Feb 9 2:00 1:00 W # War 672742SwollmanRule US 1945 only - Sep 30 2:00 0 S 682742SwollmanRule US 1967 max - Oct lastSun 2:00 0 S 692742SwollmanRule US 1967 1973 - Apr lastSun 2:00 1:00 D 702742SwollmanRule US 1974 only - Jan 6 2:00 1:00 D 712742SwollmanRule US 1975 only - Feb 23 2:00 1:00 D 722742SwollmanRule US 1976 1986 - Apr lastSun 2:00 1:00 D 732742SwollmanRule US 1987 max - Apr Sun>=1 2:00 1:00 D 7443543Swollman# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:"> 7543543Swollman# H.R.177 7643543Swollman# </a> (introduced 1999-01-06) would change April to March in the above rule. 772742Swollman 7819878Swollman# From Bob Devine (1988-01-28): 792742Swollman# ...Alaska (and Hawaii) had the timezone names changed in 1967. 802742Swollman# old new 812742Swollman# Pacific Standard Time(PST) -same- 822742Swollman# Yukon Standard Time(YST) -same- 832742Swollman# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 842742Swollman# Nome Standard Time (NT) Bering Standard Time (BST) 852742Swollman# 862742Swollman# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 872742Swollman# The YST zone now covers nearly all of the state, AHST just part 882742Swollman# of the Aleutian islands. No DST. 892742Swollman 9014343Swollman# From Paul Eggert (1995-12-19): 9114343Swollman# The tables below use `NST', not `NT', for Nome Standard Time. 9214343Swollman# I invented `CAWT' for Central Alaska War Time. 9314343Swollman 9419878Swollman# From U. S. Naval Observatory (1989-01-19): 952742Swollman# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 962742Swollman# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 972742Swollman# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 982742Swollman# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 992742Swollman# USA MOUNTAIN 7 H BEHIND UTC DENVER 1002742Swollman# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 1012742Swollman# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 1022742Swollman# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 1032742Swollman# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 1042742Swollman# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 1052742Swollman# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 1062742Swollman# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 1072742Swollman# USA HAWAII 10 H BEHIND UTC 1082742Swollman# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 1092742Swollman 11019878Swollman# From Arthur David Olson (1989-01-21): 1112742Swollman# The above dates are for 1988. 1122742Swollman# Note the "AKST" and "AKDT" abbreviations, the claim that there's 1132742Swollman# no DST in Samoa, and the claim that there is DST in Alaska and the 1142742Swollman# Aleutians. 1152742Swollman 11619878Swollman# From Arthur David Olson (1988-02-13): 1172742Swollman# Legal standard time zone names, from United States Code (1982 Edition and 1182742Swollman# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 11919878Swollman# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 1202742Swollman# took effect), as explained in sections 263 and 261: 1212742Swollman# (none) 1222742Swollman# United States standard eastern time 1232742Swollman# United States standard mountain time 1242742Swollman# United States standard central time 1252742Swollman# United States standard Pacific time 1262742Swollman# (none) 1272742Swollman# United States standard Alaska time 1282742Swollman# (none) 12919878Swollman# Next, names from 1967-04-01 until 1983-11-30 (the date for 1302742Swollman# public law 98-181): 1312742Swollman# Atlantic standard time 1322742Swollman# eastern standard time 1332742Swollman# central standard time 1342742Swollman# mountain standard time 1352742Swollman# Pacific standard time 1362742Swollman# Yukon standard time 1372742Swollman# Alaska-Hawaii standard time 1382742Swollman# Bering standard time 13919878Swollman# And after 1983-11-30: 1402742Swollman# Atlantic standard time 1412742Swollman# eastern standard time 1422742Swollman# central standard time 1432742Swollman# mountain standard time 1442742Swollman# Pacific standard time 1452742Swollman# Alaska standard time 1462742Swollman# Hawaii-Aleutian standard time 1472742Swollman# Samoa standard time 1482742Swollman# The law doesn't give abbreviations. 14914343Swollman# 15014343Swollman# From Paul Eggert (1995-12-19): 15114343Swollman# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. 15214343Swollman# Go with Shanks. 1532742Swollman 15414343Swollman# US Eastern time, represented by New York 15514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 15614343SwollmanRule NYC 1920 only - Mar lastSun 2:00 1:00 D 15714343SwollmanRule NYC 1920 only - Oct lastSun 2:00 0 S 15814343SwollmanRule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 15914343SwollmanRule NYC 1921 1954 - Sep lastSun 2:00 0 S 16014343SwollmanRule NYC 1955 1966 - Oct lastSun 2:00 0 S 16114343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 16214343SwollmanZone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 16314343Swollman -5:00 US E%sT 1920 16414343Swollman -5:00 NYC E%sT 1942 16514343Swollman -5:00 US E%sT 1946 16614343Swollman -5:00 NYC E%sT 1967 16714343Swollman -5:00 US E%sT 1682742Swollman 16914343Swollman# US Central time, represented by Chicago 17014343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 17114343SwollmanRule Chicago 1920 only - Jun 13 2:00 1:00 D 17214343SwollmanRule Chicago 1920 1921 - Oct lastSun 2:00 0 S 17314343SwollmanRule Chicago 1921 only - Mar lastSun 2:00 1:00 D 17414343SwollmanRule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 17514343SwollmanRule Chicago 1922 1954 - Sep lastSun 2:00 0 S 17614343SwollmanRule Chicago 1955 1966 - Oct lastSun 2:00 0 S 17714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17814343SwollmanZone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 17914343Swollman -6:00 US C%sT 1920 18014343Swollman -6:00 Chicago C%sT 1936 Mar 1 2:00 18114343Swollman -5:00 - EST 1936 Nov 15 2:00 18214343Swollman -6:00 Chicago C%sT 1942 18314343Swollman -6:00 US C%sT 1946 18414343Swollman -6:00 Chicago C%sT 1967 18514343Swollman -6:00 US C%sT 1862742Swollman 18714343Swollman# US Mountain time, represented by Denver 18814343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 18914343SwollmanRule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 19014343SwollmanRule Denver 1920 only - Oct lastSun 2:00 0 S 19114343SwollmanRule Denver 1921 only - May 22 2:00 0 S 19214343SwollmanRule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 19314343SwollmanRule Denver 1965 1966 - Oct lastSun 2:00 0 S 1942742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19514343SwollmanZone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 19615309Swollman -7:00 US M%sT 1920 19715309Swollman -7:00 Denver M%sT 1942 19815309Swollman -7:00 US M%sT 1946 19915309Swollman -7:00 Denver M%sT 1967 20015309Swollman -7:00 US M%sT 2012742Swollman 20214343Swollman# US Pacific time, represented by Los Angeles 20314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 20414343SwollmanRule CA 1948 only - Mar 14 2:00 1:00 D 20514343SwollmanRule CA 1949 only - Jan 1 2:00 0 S 20614343SwollmanRule CA 1950 1966 - Apr lastSun 2:00 1:00 D 20714343SwollmanRule CA 1950 1961 - Sep lastSun 2:00 0 S 20814343SwollmanRule CA 1962 1966 - Oct lastSun 2:00 0 S 20914343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 21014343SwollmanZone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 21114343Swollman -8:00 US P%sT 1946 21214343Swollman -8:00 CA P%sT 1967 21314343Swollman -8:00 US P%sT 2148029Swollman 21514343Swollman# Alaska 21614343Swollman# AK%sT is the modern abbreviation for -9:00 per USNO. 21714343Swollman# 21814343Swollman# From Paul Eggert (1995-12-19): 21914343Swollman# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 22019878Swollman# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 22119878Swollman# This was on 1867-10-18. We omit this transition, since we can't represent 22219878Swollman# changes from Julian to Gregorian. 22314343Swollman# 22414343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 22514343SwollmanZone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 22614343Swollman -8:00 - PST 1942 22714343Swollman -8:00 US P%sT 1946 22814343Swollman -8:00 - PST 1969 22914343Swollman -8:00 US P%sT 1983 Oct 30 2:00 23014343Swollman -9:00 US AK%sT 23114343SwollmanZone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 23214343Swollman -9:00 - YST 1942 23314343Swollman -9:00 US Y%sT 1946 23414343Swollman -9:00 - YST 1969 23514343Swollman -9:00 US Y%sT 1983 Oct 30 2:00 23614343Swollman -9:00 US AK%sT 23714343SwollmanZone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 23814343Swollman -10:00 - CAT 1942 23914343Swollman -10:00 US CAT/CAWT 1946 24014343Swollman -10:00 - CAT 1967 Apr 24114343Swollman -10:00 - AHST 1969 24214343Swollman -10:00 US AH%sT 1983 Oct 30 2:00 24314343Swollman -9:00 US AK%sT 24414343SwollmanZone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 24514343Swollman -11:00 - NST 1942 24614343Swollman -11:00 US N%sT 1946 24714343Swollman -11:00 - NST 1967 Apr 24814343Swollman -11:00 - BST 1969 24914343Swollman -11:00 US B%sT 1983 Oct 30 2:00 25014343Swollman -9:00 US AK%sT 25114343SwollmanZone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 25214343Swollman -11:00 - NST 1942 25314343Swollman -11:00 US N%sT 1946 25414343Swollman -11:00 - NST 1967 Apr 25514343Swollman -11:00 - BST 1969 25614343Swollman -11:00 US B%sT 1983 Oct 30 2:00 25714343Swollman -10:00 US HA%sT 25814343Swollman# Shanks writes that part of southwest Alaska (e.g. Aniak) 25914343Swollman# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 26014343Swollman# and another part (e.g. Akiak) made the same switch five weeks later. 26114343Swollman# These switches don't quite make our 1970 cutoff. 2622742Swollman 26314343Swollman# Hawaii 26414343Swollman# 26514343Swollman# From Arthur David Olson: 26614343Swollman# And then there's Hawaii. 26714343Swollman# DST was observed for one day in 1933; 26814343Swollman# standard time was changed by half an hour in 1947; 26914343Swollman# it's always standard as of 1986. 27014343Swollman# 27114343Swollman# From Paul Eggert: 27214343Swollman# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 27314343Swollman# 27414343SwollmanZone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 27514343Swollman -10:30 - HST 1933 Apr 30 2:00 27614343Swollman -10:30 1:00 HDT 1933 May 21 2:00 27714343Swollman -10:30 US H%sT 1947 Jun 8 2:00 27814343Swollman -10:00 - HST 2792742Swollman 28014343Swollman# Now we turn to US areas that have diverged from the consensus since 1970. 28114343Swollman 28214343Swollman# Arizona mostly uses MST. 28314343SwollmanZone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 28414343Swollman -7:00 US M%sT 1944 Jan 1 00:01 28514343Swollman -7:00 - MST 1944 Mar 17 00:01 28614343Swollman -7:00 US M%sT 1944 Oct 1 00:01 28714343Swollman -7:00 - MST 1967 28814343Swollman -7:00 US M%sT 1968 28914343Swollman -7:00 - MST 29019878Swollman# From Arthur David Olson (1988-02-13): 29114343Swollman# A writer from the Inter Tribal Council of Arizona, Inc., 2922742Swollman# notes in private correspondence dated 12/28/87 that "Presently, only the 2932742Swollman# Navajo Nation participates in the Daylight Saving Time policy, due to its 2942742Swollman# large size and location in three states." (The "only" means that other 2952742Swollman# tribal nations don't use DST.) 2962742Swollman 29714343SwollmanLink America/Denver America/Shiprock 2982742Swollman 29914343Swollman# Southern Idaho and eastern Oregon switched four weeks late in 1974. 30014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 30114343SwollmanZone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 30214343Swollman -8:00 US P%sT 1923 May 13 2:00 30314343Swollman -7:00 US M%sT 1974 30414343Swollman -7:00 - MST 1974 Feb 3 2:00 30514343Swollman -7:00 US M%sT 3062742Swollman 30714343Swollman# Indiana 30814343Swollman# 30958787Sru# For a map of Indiana's time zone regions, see: 31058787Sru# <a href="http://www.mccsc.edu/time.html"> 31158787Sru# What time is it in Indiana? 31258787Sru# </a> (1999-04-06) 31358787Sru# 31414343Swollman# From Paul Eggert (1995-12-19): 31514343Swollman# Indiana generally observes either EST all year, or CST/CDT, 31614343Swollman# but areas near Cincinnati and Louisville use those cities' timekeeping 31714343Swollman# and in 1969 and 1970 the whole state observed daylight time; 31814343Swollman# and there are other exceptions as noted below. 31914343Swollman# Shanks partitions Indiana into 345 regions, each with its own time history, 32014343Swollman# and writes ``Even newspaper reports present contradictory information.'' 32114343Swollman# Fortunately, most of the complexity occurred before our cutoff date of 1970. 32214343Swollman# 32314343Swollman# Since 1970, EST-only Indiana has been like America/Indianapolis, 32414343Swollman# with exceptions noted below for Crawford, Starke, and Switzerland counties. 32514343Swollman# The parts of Indiana not listed below have been like America/Chicago, 32614343Swollman# America/Louisville, or America/New_York. 32714343Swollman# 32814343Swollman# Other than Indianapolis, the Indiana place names are so nondescript 32914343Swollman# that they would be ambiguous if we left them at the `America' level. 33014343Swollman# So we reluctantly put them all in a subdirectory `America/Indiana'. 33114343Swollman# 33214343Swollman# Most of EST-only Indiana last observed DST in 1970. 33314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 33414343SwollmanRule Indianapolis 1941 only - Jun 22 2:00 1:00 D 33514343SwollmanRule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 33614343SwollmanRule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 33714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 33814343SwollmanZone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 33914343Swollman -6:00 US C%sT 1920 34014343Swollman -6:00 Indianapolis C%sT 1942 34114343Swollman -6:00 US C%sT 1946 34214343Swollman -6:00 Indianapolis C%sT 1955 Apr 24 2:00 34314343Swollman -5:00 - EST 1957 Sep 29 2:00 34414343Swollman -6:00 - CST 1958 Apr 27 2:00 34514343Swollman -5:00 - EST 1969 34614343Swollman -5:00 US E%sT 1971 34714343Swollman -5:00 - EST 34814343SwollmanLink America/Indianapolis America/Indiana/Indianapolis 3492742Swollman# 35014343Swollman# Part of Crawford County, Indiana, last observed DST in 1975, 35114343Swollman# and left its clocks alone in 1974. 35214343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 35314343SwollmanRule Marengo 1951 only - Apr lastSun 2:00 1:00 D 35414343SwollmanRule Marengo 1951 only - Sep lastSun 2:00 0 S 35514343SwollmanRule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 35614343SwollmanRule Marengo 1954 1960 - Sep lastSun 2:00 0 S 35714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 35814343SwollmanZone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 35914343Swollman -6:00 US C%sT 1951 36014343Swollman -6:00 Marengo C%sT 1961 Apr 30 2:00 36114343Swollman -5:00 - EST 1969 36214343Swollman -5:00 US E%sT 1974 Jan 6 2:00 36314343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 36414343Swollman -5:00 US E%sT 1976 36514343Swollman -5:00 - EST 36614343Swollman# 36714343Swollman# Starke County, Indiana 36819878Swollman# From Arthur David Olson (1991-10-28): 36919878Swollman# An article on page A3 of the Sunday, 1991-10-27 Washington Post 37014343Swollman# notes that Starke County switched from Central time to Eastern time as of 37119878Swollman# 1991-10-27. 37214343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 37314343SwollmanRule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 37414343SwollmanRule Starke 1947 1954 - Sep lastSun 2:00 0 S 37514343SwollmanRule Starke 1955 1956 - Oct lastSun 2:00 0 S 37614343SwollmanRule Starke 1957 1958 - Sep lastSun 2:00 0 S 37714343SwollmanRule Starke 1959 1961 - Oct lastSun 2:00 0 S 37814343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 37914343SwollmanZone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 38014343Swollman -6:00 US C%sT 1947 38114343Swollman -6:00 Starke C%sT 1962 Apr 29 2:00 38214343Swollman -5:00 - EST 1963 Oct 27 2:00 38314343Swollman -6:00 US C%sT 1991 Oct 27 2:00 38414343Swollman -5:00 - EST 38514343Swollman# 38614343Swollman# Switzerland County, Indiana, last observed DST in 1972. 38714343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 38814343SwollmanZone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 38914343Swollman -6:00 US C%sT 1954 Apr 25 2:00 39014343Swollman -5:00 - EST 1969 39114343Swollman -5:00 US E%sT 1973 39214343Swollman -5:00 - EST 3932742Swollman 39414343Swollman# Part of Kentucky left its clocks alone in 1974. 39514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 39614343SwollmanRule Louisville 1921 only - May 1 2:00 1:00 D 39714343SwollmanRule Louisville 1921 only - Sep 1 2:00 0 S 39814343SwollmanRule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 39914343SwollmanRule Louisville 1941 only - Sep lastSun 2:00 0 S 40014343SwollmanRule Louisville 1946 only - Jun 2 2:00 0 S 40114343SwollmanRule Louisville 1950 1955 - Sep lastSun 2:00 0 S 40214343SwollmanRule Louisville 1956 1960 - Oct lastSun 2:00 0 S 40314343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 40414343SwollmanZone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 40514343Swollman -6:00 US C%sT 1921 40614343Swollman -6:00 Louisville C%sT 1942 40714343Swollman -6:00 US C%sT 1946 40814343Swollman -6:00 Louisville C%sT 1961 Jul 23 2:00 40914343Swollman -5:00 - EST 1968 41014343Swollman -5:00 US E%sT 1974 Jan 6 2:00 41114343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 41214343Swollman -5:00 US E%sT 41358787Sru# Wayne, Clinton, and Russell Counties, Kentucky 41458787Sru# From 41558787Sru# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=99-26945-filed"> 41658787Sru# Federal Register Doc. 99-26945 41758787Sru# </a> (1999-10-14 08:45-04) 41858787Sru# In response to a petition by the Wayne County, Kentucky, Fiscal Court, 41958787Sru# the Department of Transportation (DOT) proposed to move Wayne County, 42058787Sru# Kentucky, from the Central Time Zone to the Eastern Time Zone.... Now 42158787Sru# the earliest date that the proposed change might take effect is 42258787Sru# October 29, 2000. 42358787Sru# 42458787Sru# From 42558787Sru# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 42658787Sru# Lake Cumberland LIFE 42758787Sru# </a> (1999-01-29) via WKYM-101.7: 42858787Sru# Clinton County has joined Wayne County in asking the DoT to change from 42958787Sru# the Central to the Eastern time zone.... The Wayne County government made 43058787Sru# the same request in December. And while Russell County officials have not 43158787Sru# taken action, the majority of respondents to a poll conducted there in 43258787Sru# August indicated they would like to change to "fast time" also. 43358787Sru# The three Lake Cumberland counties are the farthest east of any U.S. 43458787Sru# location in the Central time zone. 4352742Swollman 43614343Swollman# Michigan 43714343Swollman# 43819878Swollman# From Bob Devine (1988-01-28): 43914343Swollman# Michigan didn't observe DST from 1968 to 1973. 44014343Swollman# 44158787Sru# From Paul Eggert (1999-03-31): 44258787Sru# Shanks writes that Michigan started using standard time on 1885-09-18, 44358787Sru# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 44458787Sru# that Detroit kept 44514343Swollman# 44614343Swollman# local time until 1900 when the City Council decreed that clocks should 44714343Swollman# be put back twenty-eight minutes to Central Standard Time. Half the 44814343Swollman# city obeyed, half refused. After considerable debate, the decision 44914343Swollman# was rescinded and the city reverted to Sun time. A derisive offer to 45014343Swollman# erect a sundial in front of the city hall was referred to the 45114343Swollman# Committee on Sewers. Then, in 1905, Central time was adopted 45214343Swollman# by city vote. 45314343Swollman# 45414343Swollman# This story is too entertaining to be false, so go with Howse over Shanks. 45514343Swollman# 45614343Swollman# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 45714343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 45814343SwollmanRule Detroit 1948 only - Apr lastSun 2:00 1:00 D 45914343SwollmanRule Detroit 1948 only - Sep lastSun 2:00 0 S 46014343SwollmanRule Detroit 1967 only - Jun 14 2:00 1:00 D 46114343SwollmanRule Detroit 1967 only - Oct lastSun 2:00 0 S 46214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 46314343SwollmanZone America/Detroit -5:32:11 - LMT 1905 46414343Swollman -6:00 - CST 1915 May 15 2:00 46514343Swollman -5:00 - EST 1942 46614343Swollman -5:00 US E%sT 1946 46714343Swollman -5:00 Detroit E%sT 1973 46814343Swollman -5:00 US E%sT 1975 46914343Swollman -5:00 - EST 1975 Apr 27 2:00 47014343Swollman -5:00 US E%sT 47114343Swollman# 47214343Swollman# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 47314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 47414343SwollmanRule Menominee 1946 only - Apr lastSun 2:00 1:00 D 47514343SwollmanRule Menominee 1946 only - Sep lastSun 2:00 0 S 47614343SwollmanRule Menominee 1966 only - Apr lastSun 2:00 1:00 D 47714343SwollmanRule Menominee 1966 only - Oct lastSun 2:00 0 S 47814343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 47914343SwollmanZone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 48014343Swollman -6:00 US C%sT 1946 48114343Swollman -6:00 Menominee C%sT 1969 Apr 27 2:00 48214343Swollman -5:00 - EST 1973 Apr 29 2:00 48314343Swollman -6:00 US C%sT 48414343Swollman 4852742Swollman# Navassa 48643543Swollman# claimed by US under the provisions of the 1856 Guano Islands Act 48743543Swollman# also claimed by Haiti 48843543Swollman# occupied 1857/1900 by the Navassa Phosphate Co 48943543Swollman# US lighthouse 1917/1997-01 49043543Swollman# currently uninhabited 49143543Swollman# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 49243543Swollman# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 49343543Swollman# Jimmy Skaggs, _The Great Guano Rush_ (1994). 49414343Swollman 49519878Swollman# Old names, for S5 users 49619878Swollman 49719878Swollman# Link LINK-FROM LINK-TO 49819878SwollmanLink America/New_York EST5EDT 49919878SwollmanLink America/Chicago CST6CDT 50019878SwollmanLink America/Denver MST7MDT 50119878SwollmanLink America/Los_Angeles PST8PDT 50219878SwollmanLink America/Indianapolis EST 50319878SwollmanLink America/Phoenix MST 50419878SwollmanLink Pacific/Honolulu HST 50519878Swollman 5062742Swollman################################################################################ 5072742Swollman 5082742Swollman 50958787Sru# From Paul Eggert <eggert@twinsun.com> (1999-10-29): 51014343Swollman# A good source for time zone historical data outside the US is 51158787Sru# Thomas G. Shanks, The International Atlas (5th edition), 51258787Sru# San Diego: ACS Publications, Inc. (1999). 5132742Swollman# 51458787Sru# Gwillim Law <Gwil_Law@bridge-point.com> writes that a good source 51520094Swollman# for recent time zone data is the International Air Transport 51620094Swollman# Association's Standard Schedules Information Manual (IATA SSIM), 51720094Swollman# published semiannually. Law sent in several helpful summaries 51820094Swollman# of the IATA's data after 1990. 51920094Swollman# 52020094Swollman# Except where otherwise noted, Shanks is the source for entries through 1990, 52120094Swollman# and IATA SSIM is the source for entries after 1990. 52220094Swollman# 5232742Swollman# Another source occasionally used is Edward W. Whitman, World Time Differences, 5242742Swollman# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 5252742Swollman# I found in the UCLA library. 5262742Swollman# 5279908Swollman# See the `europe' file for Greenland. 5282742Swollman 5292742Swollman# Canada 5302742Swollman 5319908Swollman# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 5329908Swollman# I post here the time zone abbreviations standardized in Canada 5339908Swollman# for both English and French in the CAN/CSA-Z234.4-89 standard.... 5349908Swollman# 5359908Swollman# UTC Standard time Daylight savings time 5369908Swollman# offset French English French English 5379908Swollman# -2:30 - - HAT NDT 5389908Swollman# -3 - - HAA ADT 5399908Swollman# -3:30 HNT NST - - 5409908Swollman# -4 HNA AST HAE EDT 5419908Swollman# -5 HNE EST HAC CDT 5429908Swollman# -6 HNC CST HAR MDT 5439908Swollman# -7 HNR MST HAP PDT 5449908Swollman# -8 HNP PST HAY YDT 5459908Swollman# -9 HNY YST - - 5469908Swollman# 5479908Swollman# HN: Heure Normale ST: Standard Time 5489908Swollman# HA: Heure Avanc<e'>e DT: Daylight saving Time 5499908Swollman# 5509908Swollman# A: de l'Atlantique Atlantic 5519908Swollman# C: du Centre Central 5529908Swollman# E: de l'Est Eastern 5539908Swollman# M: Mountain 5549908Swollman# N: Newfoundland 5559908Swollman# P: du Pacifique Pacific 5569908Swollman# R: des Rocheuses 5579908Swollman# T: de Terre-Neuve 5589908Swollman# Y: du Yukon Yukon 5599908Swollman# 5609908Swollman# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 5619908Swollman# Alas, this sort of thing must be handled by localization software. 5622742Swollman 56358787Sru# The data for Canada are all from Shanks. 5649908Swollman 5659908Swollman 5662742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 56717200SwollmanRule Canada 1918 only - Apr 14 2:00 1:00 D 56817200SwollmanRule Canada 1918 only - Oct 31 2:00 0 S 56917200SwollmanRule Canada 1942 only - Feb 9 2:00 1:00 D 57017200SwollmanRule Canada 1945 only - Sep 30 2:00 0 S 57117200SwollmanRule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 57217200SwollmanRule Canada 1974 max - Oct lastSun 2:00 0 S 57317200SwollmanRule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 57417200Swollman 57517200Swollman 57620094Swollman# Newfoundland (except Labrador) 57717200Swollman 57817200Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5792742SwollmanRule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 5802742SwollmanRule StJohns 1917 only - Sep 17 2:00 0 S 5812742SwollmanRule StJohns 1918 only - Oct 31 2:00 0 S 5822742Swollman# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 5832742SwollmanRule StJohns 1919 only - May 5 23:00 1:00 D 5842742SwollmanRule StJohns 1919 only - Aug 12 23:00 0 S 5852742Swollman# For 1931-1935 Whitman gives Apr same date; go with Shanks. 5862742SwollmanRule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 5872742SwollmanRule StJohns 1920 1935 - Oct lastSun 23:00 0 S 5882742Swollman# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 5892742SwollmanRule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 5902742SwollmanRule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 5912742Swollman# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 5922742SwollmanRule StJohns 1942 only - Mar 1 0:00 1:00 D 5932742SwollmanRule StJohns 1942 only - Dec 31 0:00 0 S 5942742SwollmanRule StJohns 1943 only - May 30 0:00 1:00 D 5952742SwollmanRule StJohns 1943 only - Sep 5 0:00 0 S 5962742SwollmanRule StJohns 1944 only - Jul 10 0:00 1:00 D 5972742SwollmanRule StJohns 1944 only - Sep 2 0:00 0 S 5982742SwollmanRule StJohns 1945 only - Jan 1 0:00 1:00 D 5992742SwollmanRule StJohns 1945 only - Oct 7 2:00 0 S 6002742Swollman# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 6012742Swollman# Apr 30 - Sep 24; go with Shanks. 6022742SwollmanRule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 6032742SwollmanRule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 6042742SwollmanRule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 6052742SwollmanRule StJohns 1951 1959 - Sep lastSun 2:00 0 S 6062742SwollmanRule StJohns 1960 max - Oct lastSun 2:00 0 S 6072742SwollmanRule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 60814343SwollmanRule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD 6092742SwollmanRule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 6102742Swollman# St John's has an apostrophe, but Posix file names can't have apostrophes. 6112742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6122742SwollmanZone America/St_Johns -3:30:52 - LMT 1884 61320094Swollman -3:30:52 StJohns N%sT 1935 Mar 30 6142742Swollman -3:30 StJohns N%sT 6152742Swollman 6168029Swollman 61720094Swollman# east Labrador 61817200Swollman 61920094Swollman# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 62020094Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 62120094SwollmanZone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 62220094Swollman -3:30:52 StJohns NST 1919 62320094Swollman -3:30:52 - NST 1935 Mar 30 62420094Swollman -3:30 - NST 1936 62520094Swollman -3:30 StJohns N%sT 1966 Mar 15 2:00 62620094Swollman -4:00 StJohns A%sT 62720094Swollman 62820094Swollman 62920094Swollman# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 63020094Swollman 63117200Swollman# From Paul Eggert (1996-06-12): 63217200Swollman# Shanks writes that since 1970 most of this region has been like Halifax. 63317200Swollman# Many locales did not observe peacetime DST until 1972; 63417200Swollman# Glace Bay, NS is the largest that we know of. 63517200Swollman# Shanks also writes that Liverpool, NS was the only town in Canada to observe 63617200Swollman# DST in 1971 but not 1970; for now we'll assume this is a typo. 63717200Swollman 6382742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6392742SwollmanRule Halifax 1916 only - Apr 1 0:00 1:00 D 6402742SwollmanRule Halifax 1916 only - Oct 1 0:00 0 S 6412742SwollmanRule Halifax 1918 only - Apr 14 2:00 1:00 D 6422742SwollmanRule Halifax 1918 only - Oct 31 2:00 0 S 6432742SwollmanRule Halifax 1920 only - May 9 0:00 1:00 D 6442742SwollmanRule Halifax 1920 only - Aug 29 0:00 0 S 6452742SwollmanRule Halifax 1921 only - May 6 0:00 1:00 D 6462742SwollmanRule Halifax 1921 1922 - Sep 5 0:00 0 S 6472742SwollmanRule Halifax 1922 only - Apr 30 0:00 1:00 D 6482742SwollmanRule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 6492742SwollmanRule Halifax 1923 only - Sep 4 0:00 0 S 6502742SwollmanRule Halifax 1924 only - Sep 15 0:00 0 S 6512742SwollmanRule Halifax 1925 only - Sep 28 0:00 0 S 6522742SwollmanRule Halifax 1926 only - May 16 0:00 1:00 D 6532742SwollmanRule Halifax 1926 only - Sep 13 0:00 0 S 6542742SwollmanRule Halifax 1927 only - May 1 0:00 1:00 D 6552742SwollmanRule Halifax 1927 only - Sep 26 0:00 0 S 6562742SwollmanRule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 6572742SwollmanRule Halifax 1928 only - Sep 9 0:00 0 S 6582742SwollmanRule Halifax 1929 only - Sep 3 0:00 0 S 6592742SwollmanRule Halifax 1930 only - Sep 15 0:00 0 S 6602742SwollmanRule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 6612742SwollmanRule Halifax 1933 only - Apr 30 0:00 1:00 D 6622742SwollmanRule Halifax 1933 only - Oct 2 0:00 0 S 6632742SwollmanRule Halifax 1934 only - May 20 0:00 1:00 D 6642742SwollmanRule Halifax 1934 only - Sep 16 0:00 0 S 6652742SwollmanRule Halifax 1935 only - Jun 2 0:00 1:00 D 6662742SwollmanRule Halifax 1935 only - Sep 30 0:00 0 S 6672742SwollmanRule Halifax 1936 only - Jun 1 0:00 1:00 D 6682742SwollmanRule Halifax 1936 only - Sep 14 0:00 0 S 6692742SwollmanRule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 6702742SwollmanRule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 6712742SwollmanRule Halifax 1939 only - May 28 0:00 1:00 D 6722742SwollmanRule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 6732742SwollmanRule Halifax 1942 only - Feb 9 2:00 1:00 D 6742742SwollmanRule Halifax 1945 1959 - Sep lastSun 2:00 0 S 6752742SwollmanRule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 6762742SwollmanRule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 6772742SwollmanRule Halifax 1962 max - Oct lastSun 2:00 0 S 6782742SwollmanRule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 6792742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6802742SwollmanZone America/Halifax -4:14:24 - LMT 1902 Jun 15 6812742Swollman -4:00 Halifax A%sT 68217200SwollmanZone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 68317200Swollman -4:00 Canada A%sT 1953 68417200Swollman -4:00 Halifax A%sT 1954 68517200Swollman -4:00 - AST 1972 68617200Swollman -4:00 Halifax A%sT 6872742Swollman 6888029Swollman 68917200Swollman# Ontario, Quebec 69017200Swollman 69117200Swollman# From Paul Eggert (1996-06-12): 69217200Swollman# Shanks writes that since 1970 most of this region has been like Montreal. 69317200Swollman# Thunder Bay skipped DST in 1973. 69417200Swollman# Many smaller locales did not observe peacetime DST until 1974; 69517200Swollman# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 69617200Swollman# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 69717200Swollman 69843014Swollman# From Paul Eggert (1997-10-17): 69943014Swollman# msb@sq.com writes that an article in the 1997-10-14 Toronto Star 70043014Swollman# says that Atikokan, Ontario currently does not observe DST, 70143014Swollman# but will vote on 11-10 whether to use EST/EDT. 70243014Swollman# He also writes that the 70343014Swollman# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 70443014Swollman# Ontario Time Act (1990, Chapter T.9) 70543014Swollman# </a> 70643014Swollman# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 70743014Swollman# Officially Atikokan is therefore on CST/CDT, and most likely this report 70843014Swollman# concerns a non-official time observed as a matter of local practice. 70958787Sru# For what it's worth, Shanks says that Atikokan has agreed with 71043014Swollman# Rainy River ever since standard time was introduced. 71143014Swollman 7122742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7132742SwollmanRule Mont 1917 only - Mar 25 2:00 1:00 D 7142742SwollmanRule Mont 1917 only - Apr 24 0:00 0 S 7152742SwollmanRule Mont 1918 only - Apr 14 2:00 1:00 D 7162742SwollmanRule Mont 1918 only - Oct 31 2:00 0 S 7172742SwollmanRule Mont 1919 only - Mar 31 2:30 1:00 D 7182742SwollmanRule Mont 1919 only - Oct 25 2:30 0 S 7192742SwollmanRule Mont 1920 only - May 2 2:30 1:00 D 7202742SwollmanRule Mont 1920 only - Oct 3 2:30 0 S 7212742SwollmanRule Mont 1921 only - May 1 2:00 1:00 D 7222742SwollmanRule Mont 1921 only - Oct 2 2:30 0 S 7232742SwollmanRule Mont 1922 only - Apr 30 2:00 1:00 D 7242742SwollmanRule Mont 1922 only - Oct 1 2:30 0 S 7252742SwollmanRule Mont 1924 only - May 17 2:00 1:00 D 7262742SwollmanRule Mont 1924 1926 - Sep lastSun 2:30 0 S 7272742SwollmanRule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 7282742SwollmanRule Mont 1927 only - May 1 0:00 1:00 D 7292742SwollmanRule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 7302742SwollmanRule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 7312742SwollmanRule Mont 1932 only - May 1 0:00 1:00 D 7322742SwollmanRule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 7332742SwollmanRule Mont 1933 only - Oct 1 0:00 0 S 7342742SwollmanRule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 7352742SwollmanRule Mont 1945 1948 - Sep lastSun 2:00 0 S 7362742SwollmanRule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 7372742SwollmanRule Mont 1949 1950 - Oct lastSun 2:00 0 S 7382742SwollmanRule Mont 1951 1956 - Sep lastSun 2:00 0 S 7392742SwollmanRule Mont 1957 max - Oct lastSun 2:00 0 S 7402742SwollmanRule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 7412742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7422742SwollmanZone America/Montreal -4:54:16 - LMT 1884 7432742Swollman -5:00 Mont E%sT 74417200SwollmanZone America/Thunder_Bay -5:57:00 - LMT 1895 74517200Swollman -5:00 Canada E%sT 1970 74617200Swollman -5:00 Mont E%sT 1973 74717200Swollman -5:00 - EST 1974 74817200Swollman -5:00 Canada E%sT 74917200SwollmanZone America/Nipigon -5:53:04 - LMT 1895 75017200Swollman -5:00 Canada E%sT 75117200SwollmanZone America/Rainy_River -6:17:56 - LMT 1895 75217200Swollman -6:00 Canada C%sT 7532742Swollman 7548029Swollman 75517200Swollman# Manitoba 75619878Swollman 7572742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7582742SwollmanRule Winn 1916 only - Apr 23 0:00 1:00 D 7592742SwollmanRule Winn 1916 only - Sep 17 0:00 0 S 7602742SwollmanRule Winn 1918 only - Apr 14 2:00 1:00 D 7612742SwollmanRule Winn 1918 only - Oct 31 2:00 0 S 7622742SwollmanRule Winn 1937 only - May 16 2:00 1:00 D 76314343SwollmanRule Winn 1937 only - Sep 26 2:00 0 S 7642742SwollmanRule Winn 1942 only - Feb 9 2:00 1:00 D 7652742SwollmanRule Winn 1945 only - Sep lastSun 2:00 0 S 7662742SwollmanRule Winn 1946 only - May 12 2:00 1:00 D 7672742SwollmanRule Winn 1946 only - Oct 13 2:00 0 S 7682742SwollmanRule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 76914343SwollmanRule Winn 1947 1949 - Sep lastSun 2:00 0 S 77014343SwollmanRule Winn 1950 only - May 1 2:00 1:00 D 77114343SwollmanRule Winn 1950 only - Sep 30 2:00 0 S 77214343SwollmanRule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 77314343SwollmanRule Winn 1951 1958 - Sep lastSun 2:00 0 S 7742742SwollmanRule Winn 1959 only - Oct lastSun 2:00 0 S 7752742SwollmanRule Winn 1960 only - Sep lastSun 2:00 0 S 7762742SwollmanRule Winn 1963 only - Apr lastSun 2:00 1:00 D 77714343SwollmanRule Winn 1963 only - Sep 22 2:00 0 S 7782742SwollmanRule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 77914343SwollmanRule Winn 1966 max - Oct lastSun 2:00 0 S 7802742SwollmanRule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 7812742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7822742SwollmanZone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 7832742Swollman -6:00 Winn C%sT 7842742Swollman 7858029Swollman 78617200Swollman# Saskatchewan 78717200Swollman 78817200Swollman# From Paul Eggert (1996-06-12): 78917200Swollman# Shanks writes that since 1970 most of this region has been like Regina. 79017200Swollman# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 79117200Swollman# Other western towns (e.g. Lloydminster) are like Edmonton. 79217200Swollman 79319878Swollman# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 79417200Swollman# The. . .below is based on information I got from our law library, the 79517200Swollman# provincial archives, and the provincial Community Services department. 79617200Swollman# A precise history would require digging through newspaper archives, and 79717200Swollman# since you didn't say what you wanted, I didn't bother. 79817200Swollman# 79917200Swollman# Saskatchewan is split by a time zone meridian (105W) and over the years 80017200Swollman# the boundary became pretty ragged as communities near it reevaluated 80117200Swollman# their affiliations in one direction or the other. In 1965 a provincial 80217200Swollman# referendum favoured legislating common time practices. 80317200Swollman# 80417200Swollman# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 80517200Swollman# Saskatchewan 1978) was proclaimed, and established that the eastern 80617200Swollman# part of Saskatchewan would use CST year round, that districts in 80717200Swollman# northwest Saskatchewan would by default follow CST but could opt to 80817200Swollman# follow Mountain Time rules (thus 1 hour difference in the winter and 80917200Swollman# zero in the summer), and that districts in southwest Saskatchewan would 81017200Swollman# by default follow MT but could opt to follow CST. 81117200Swollman# 81217200Swollman# It took a few years for the dust to settle (I know one story of a town 81317200Swollman# on one time zone having its school in another, such that a mom had to 81417200Swollman# serve her family lunch in two shifts), but presently it seems that only 81517200Swollman# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 81617200Swollman# rules any more; all other districts appear to have used CST year round 81717200Swollman# since sometime in the 1960s. 81817200Swollman 8192742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8202742SwollmanRule Regina 1918 only - Apr 14 2:00 1:00 D 8212742SwollmanRule Regina 1918 only - Oct 31 2:00 0 S 8222742SwollmanRule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 8232742SwollmanRule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 8242742SwollmanRule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 8252742SwollmanRule Regina 1937 only - Oct Sun>=8 0:00 0 S 8262742SwollmanRule Regina 1938 only - Oct Sun>=1 0:00 0 S 8272742SwollmanRule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 8282742SwollmanRule Regina 1942 only - Feb 9 2:00 1:00 D 8292742SwollmanRule Regina 1945 only - Sep lastSun 2:00 0 S 83017200SwollmanRule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 83117200SwollmanRule Regina 1946 only - Oct Sun>=8 2:00 0 S 83217200SwollmanRule Regina 1947 1959 - Apr lastSun 2:00 1:00 D 83317200SwollmanRule Regina 1947 1958 - Sep lastSun 2:00 0 S 83417200SwollmanRule Regina 1959 only - Oct lastSun 2:00 0 S 83517200Swollman# 83617200SwollmanRule Swift 1957 only - Apr lastSun 2:00 1:00 D 83717200SwollmanRule Swift 1957 only - Oct lastSun 2:00 0 S 83817200SwollmanRule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 83917200SwollmanRule Swift 1959 only - Oct lastSun 2:00 0 S 84017200SwollmanRule Swift 1960 1961 - Sep lastSun 2:00 0 S 8412742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 84217200SwollmanZone America/Regina -6:58:36 - LMT 1905 Sep 84317200Swollman -7:00 Regina M%sT 1960 Apr lastSun 2:00 8442742Swollman -6:00 - CST 84517200SwollmanZone America/Swift_Current -7:11:20 - LMT 1905 Sep 84617200Swollman -7:00 Canada M%sT 1946 Apr lastSun 2:00 84717200Swollman -7:00 Regina M%sT 1950 84817200Swollman -7:00 Swift M%sT 1972 Apr lastSun 2:00 84917200Swollman -6:00 - CST 8502742Swollman 8518029Swollman 85217200Swollman# Alberta 85317200Swollman 8542742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8552742SwollmanRule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 8562742SwollmanRule Edm 1918 only - Oct 31 2:00 0 S 8572742SwollmanRule Edm 1919 only - May 27 2:00 0 S 8582742SwollmanRule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 8592742SwollmanRule Edm 1920 only - Oct lastSun 2:00 0 S 8602742SwollmanRule Edm 1921 1923 - Sep lastSun 2:00 0 S 8612742SwollmanRule Edm 1942 only - Feb 9 2:00 1:00 D 8622742SwollmanRule Edm 1945 only - Sep lastSun 2:00 0 S 8632742SwollmanRule Edm 1947 only - Apr lastSun 2:00 1:00 D 8642742SwollmanRule Edm 1947 only - Sep lastSun 2:00 0 S 8652742SwollmanRule Edm 1967 only - Apr lastSun 2:00 1:00 D 8662742SwollmanRule Edm 1967 only - Oct lastSun 2:00 0 S 8672742SwollmanRule Edm 1969 only - Apr lastSun 2:00 1:00 D 8682742SwollmanRule Edm 1969 only - Oct lastSun 2:00 0 S 8692742SwollmanRule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 8702742SwollmanRule Edm 1972 max - Oct lastSun 2:00 0 S 8712742SwollmanRule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 8722742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8732742SwollmanZone America/Edmonton -7:33:52 - LMT 1906 Sep 8742742Swollman -7:00 Edm M%sT 8752742Swollman 8768029Swollman 87717200Swollman# British Columbia 87817200Swollman 87917200Swollman# From Paul Eggert (1996-06-12): 88017200Swollman# Shanks writes that since 1970 most of this region has been like Vancouver. 88158787Sru# Dawson Creek uses MST. Much of east BC is like Edmonton. 88217200Swollman 8832742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8842742SwollmanRule Vanc 1918 only - Apr 14 2:00 1:00 D 8852742SwollmanRule Vanc 1918 only - Oct 31 2:00 0 S 8862742SwollmanRule Vanc 1942 only - Feb 9 2:00 1:00 D 8872742SwollmanRule Vanc 1945 only - Sep 30 2:00 0 S 8882742SwollmanRule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 8892742SwollmanRule Vanc 1946 only - Oct 13 2:00 0 S 8902742SwollmanRule Vanc 1947 1961 - Sep lastSun 2:00 0 S 8912742SwollmanRule Vanc 1962 max - Oct lastSun 2:00 0 S 8922742SwollmanRule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 8932742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8942742SwollmanZone America/Vancouver -8:12:28 - LMT 1884 8952742Swollman -8:00 Vanc P%sT 89617200SwollmanZone America/Dawson_Creek -8:00:56 - LMT 1884 89717200Swollman -8:00 Canada P%sT 1947 89817200Swollman -8:00 Vanc P%sT 1972 Aug 30 2:00 89917200Swollman -7:00 - MST 9002742Swollman 9018029Swollman 90258787Sru# Northwest Territories, Nunavut, Yukon 90317200Swollman 90458787Sru# From Paul Eggert (1999-10-29): 90517200Swollman# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 90620094Swollman# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 90720094Swollman# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 90820094Swollman# c. 7 defines Yukon standard time as UTC-9. This is still valid; 90920094Swollman# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 91020094Swollman# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 91120094Swollman# * O.I.C. 1980/02 established DST. 91220094Swollman# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 91320094Swollman# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 91417200Swollman 91558787Sru# From Rives McDow (1999-09-04): 91658787Sru# Nunavut ... moved ... to incorporate the whole territory into one time zone. 91758787Sru# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 91858787Sru# Nunavut moves to single time zone Oct. 31 91958787Sru# </a> 92058787Sru# 92158787Sru# From Antoine Leca (1999-09-06): 92258787Sru# We then need to create a new timezone for the Kitikmeot region of Nunavut 92358787Sru# to differentiate it from the Yellowknife region. 92458787Sru 92558787Sru# From Paul Eggert (1999-09-20): 92658787Sru# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 92758787Sru# Basic Facts: The New Territory 92858787Sru# </a> (1999) reports that Pangnirtung operates on Eastern time, 92958787Sru# and that Coral Harbour does not observe DST. We don't know when 93058787Sru# Pangnirtung switched to Eastern time; we'll guess 1995. 93158787Sru# We'll ignore the claim about Coral Harbour for now, 93258787Sru# since we have no further info. 93358787Sru 93458787Sru# From Rives McDow (1999-11-08): 93558787Sru# On October 31, when the rest of Nunavut went to Central time, 93658787Sru# Pangnirtung wobbled. Here is the result of their wobble: 93758787Sru# 93858787Sru# The following businesses and organizations in Pangnirtung use Central Time: 93958787Sru# 94058787Sru# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 94158787Sru# Eastern Arctic National Parks, A & D Specialist 94258787Sru# 94358787Sru# The following businesses and organizations in Pangnirtung use Eastern Time: 94458787Sru# 94558787Sru# Hamlet office, All other businesses, Both schools, Airport operator 94658787Sru# 94758787Sru# This has made for an interesting situation there, which warranted the news. 94858787Sru# No one there that I spoke with seems concerned, or has plans to 94958787Sru# change the local methods of keeping time, as it evidently does not 95058787Sru# really interfere with any activities or make things difficult locally. 95158787Sru# They plan to celebrate New Year's turn-over twice, one hour apart, 95258787Sru# so it appears that the situation will last at least that long. 95358787Sru# The Nunavut Intergovernmental Affairs hopes that they will "come to 95458787Sru# their senses", but the locals evidently don't see any problem with 95558787Sru# the current state of affairs. 95658787Sru 95758787Sru# From Michaela Rodrigue, writing in the 95858787Sru# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 95958787Sru# Nunatsiaq News (1999-11-19)</a>: 96058787Sru# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 96158787Sru# central - or Nunavut time - for government offices, and eastern time 96258787Sru# for municipal offices and schools.... Igloolik [was similar but then] 96358787Sru# made the switch to central time on Saturday, Nov. 6. 96458787Sru 9652742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 96617200SwollmanRule NT_YK 1918 only - Apr 14 2:00 1:00 D 96717200SwollmanRule NT_YK 1918 only - Oct 27 2:00 0 S 96817200SwollmanRule NT_YK 1919 only - May 25 2:00 1:00 D 96917200SwollmanRule NT_YK 1919 only - Nov 1 0:00 0 S 97017200SwollmanRule NT_YK 1942 only - Feb 9 2:00 1:00 D 97117200SwollmanRule NT_YK 1945 only - Sep 30 2:00 0 S 97217200SwollmanRule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 97317200SwollmanRule NT_YK 1965 only - Oct lastSun 2:00 0 S 97417200SwollmanRule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 97517200SwollmanRule NT_YK 1980 max - Oct lastSun 2:00 0 S 97617200SwollmanRule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 9772742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 97817200SwollmanZone America/Pangnirtung -4:22:56 - LMT 1884 97958787Sru -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 98058787Sru -5:00 Canada E%sT 1999 Oct 31 2:00 98158787Sru -6:00 Canada C%sT 98258787SruZone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 98358787Sru -5:00 NT_YK E%sT 1999 Oct 31 2:00 98458787Sru -6:00 Canada C%sT 98517200SwollmanZone America/Rankin_Inlet -6:08:40 - LMT 1884 98617200Swollman -6:00 NT_YK C%sT 98758787SruZone America/Cambridge_Bay -7:00:20 - LMT 1884 98858787Sru -7:00 NT_YK M%sT 1999 Oct 31 2:00 98958787Sru -6:00 Canada C%sT 99017200SwollmanZone America/Yellowknife -7:37:24 - LMT 1884 99117200Swollman -7:00 NT_YK M%sT 99217200SwollmanZone America/Inuvik -8:54:00 - LMT 1884 99317200Swollman -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 99417200Swollman -7:00 NT_YK M%sT 9952742SwollmanZone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 99617200Swollman -9:00 NT_YK Y%sT 1966 Jul 1 2:00 99717200Swollman -8:00 NT_YK P%sT 99817200SwollmanZone America/Dawson -9:17:40 - LMT 1900 Aug 20 99920094Swollman -9:00 NT_YK Y%sT 1973 Oct 28 0:00 100017200Swollman -8:00 NT_YK P%sT 10012742Swollman 10028029Swollman 10032742Swollman############################################################################### 10042742Swollman 10052742Swollman# Mexico 10062742Swollman 100764499Swollman# Gwillim Law reports this source for daylight saving time in Mexico: 100864499Swollman# <a href="http://www.spin.com.mx/verano/"> 100964499Swollman# Daylight saving time * SPIN-Internet (in Spanish) 101064499Swollman# </a> 101164499Swollman# Law (2000-03-09) translates it as follows: 10122742Swollman# 101364499Swollman# Standard time effective in Mexico takes its origin in the 101464499Swollman# presidential decree of April 24, 1942. The time of the 120th 101564499Swollman# meridian applies to the state of Baja California; of the 105th 101664499Swollman# meridian to the states of Baja California Sur, Sonora, Sinaloa, and 101764499Swollman# Nayarit; and the time of the 90th meridian to the rest of the 101864499Swollman# country. 10192742Swollman# 102064499Swollman# In the country, there have been several attempts made to adapt 102164499Swollman# standard time with the object of arriving at a better use of 102264499Swollman# daylight for social and economic activities. In December, 1981 a 102364499Swollman# permanent time zone was decreed for the states of Campeche, Yucatan, 102464499Swollman# and Quintana Roo, displacing them from the 90th to the 75th 102564499Swollman# meridian. This disposition was annulled on December 2, 1982. 102664499Swollman# 102764499Swollman# In 1988 a Summer Time was established for the states of Tamaulipas, 102864499Swollman# Nuevo Leon, Coahuila, and Durango, which meant that from the first 102964499Swollman# Sunday in April to the last [Sunday] of October those states 103064499Swollman# displaced their time from the 90th to the 75th meridian. That 103164499Swollman# disposition lasted for one year. 10322742Swollman 103364499Swollman# From Paul Eggert (2000-07-26): 103464499Swollman# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 103564499Swollman# and 1988 DST experiments. Go with spin.com.mx. 10362742Swollman 103717200Swollman# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 103817200Swollman# A guy from our Mexico subsidiary finally found the Presidential Decree 103917200Swollman# outlining the timezone changes in Mexico. 104058787Sru# 104117200Swollman# ------------- Begin Forwarded Message ------------- 104258787Sru# 104317200Swollman# I finally got my hands on the Official Presidential Decree that sets up the 104417200Swollman# rules for the DST changes. The rules are: 104558787Sru# 104617200Swollman# 1. The country is divided in 3 timezones: 104717200Swollman# - Baja California Norte (the Mexico/BajaNorte TZ) 104817200Swollman# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 104917200Swollman# - The rest of the country (the Mexico/General TZ) 105058787Sru# 105117200Swollman# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 105217200Swollman# at 2:00 AM, the times in each zone are as follows: 105317200Swollman# BajaNorte: GMT+7 105417200Swollman# BajaSur: GMT+6 105517200Swollman# General: GMT+5 105658787Sru# 105717200Swollman# 3. The rest of the year, the times are as follows: 105817200Swollman# BajaNorte: GMT+8 105917200Swollman# BajaSur: GMT+7 106017200Swollman# General: GMT+6 106158787Sru# 106217200Swollman# The Decree was published in Mexico's Official Newspaper on January 4th. 106358787Sru# 106417200Swollman# -------------- End Forwarded Message -------------- 106517200Swollman# From Paul Eggert (1996-06-12): 106643014Swollman# For an English translation of the decree, see 106743014Swollman# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 106843014Swollman# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 106943014Swollman# </a> 107014343Swollman 107143543Swollman# From Rives McDow (1998-10-08): 107243543Swollman# The State of Quintana Roo has reverted back to central STD and DST times 107343543Swollman# (i.e. UTC -0600 and -0500 as of 1998-08-02). 107443543Swollman 107558787Sru# From Rives McDow (2000-01-10): 107658787Sru# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 107758787Sru# zone 5 hours from the International Date Line, and will not observe daylight 107858787Sru# savings time so as to stay on the same time zone as the southern part of 107958787Sru# Arizona year round. 108058787Sru 10812742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10822742SwollmanRule Mexico 1939 only - Feb 5 0:00 1:00 D 10832742SwollmanRule Mexico 1939 only - Jun 25 0:00 0 S 10842742SwollmanRule Mexico 1940 only - Dec 9 0:00 1:00 D 10852742SwollmanRule Mexico 1941 only - Apr 1 0:00 0 S 10862742SwollmanRule Mexico 1943 only - Dec 16 0:00 1:00 D 10872742SwollmanRule Mexico 1944 only - May 1 0:00 0 S 10882742SwollmanRule Mexico 1950 only - Feb 12 0:00 1:00 D 10892742SwollmanRule Mexico 1950 only - Jul 30 0:00 0 S 109014343SwollmanRule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D 109114343SwollmanRule Mexico 1996 max - Oct lastSun 2:00 0 S 109214343Swollman# 109358787SruRule BajaN 1954 1961 - Apr lastSun 2:00 1:00 D 109458787SruRule BajaN 1954 1961 - Sep lastSun 2:00 0 S 10952742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 109643014Swollman# Quintana Roo 109758787SruZone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 109864499Swollman -6:00 - CST 1981 Dec 109964499Swollman -5:00 - EST 1982 Dec 2 110043014Swollman -6:00 - CST 1996 110143014Swollman -6:00 Mexico C%sT 1997 Oct lastSun 2:00 110243543Swollman -5:00 Mexico E%sT 1998 Aug 2 2:00 110343543Swollman -6:00 Mexico C%sT 110464499Swollman# Campeche, Yucatan 110564499SwollmanZone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 110664499Swollman -6:00 - CST 1981 Dec 110764499Swollman -5:00 - EST 1982 Dec 2 110864499Swollman -6:00 Mexico C%sT 110964499Swollman# Coahuila, Durango, Nuevo Leon, Tamaulipas 111064499SwollmanZone America/Monterrey -6:41:16 - LMT 1922 Jan 1 0:01:32 111164499Swollman -6:00 - CST 1988 111264499Swollman -6:00 US C%sT 1989 111364499Swollman -6:00 Mexico C%sT 111443014Swollman# Central Mexico 11152742SwollmanZone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 11162742Swollman -7:00 - MST 1927 Jun 10 23:00 11172742Swollman -6:00 - CST 1930 Nov 15 11182742Swollman -7:00 - MST 1931 May 1 23:00 11192742Swollman -6:00 - CST 1931 Oct 11202742Swollman -7:00 - MST 1932 Mar 30 23:00 11212742Swollman -6:00 Mexico C%sT 112243014Swollman# Chihuahua 112358787SruZone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 112443014Swollman -7:00 - MST 1927 Jun 10 23:00 112543014Swollman -6:00 - CST 1930 Nov 15 112643014Swollman -7:00 - MST 1931 May 1 23:00 112743014Swollman -6:00 - CST 1931 Oct 112843014Swollman -7:00 - MST 1932 Mar 30 23:00 112943014Swollman -6:00 - CST 1996 113043014Swollman -6:00 Mexico C%sT 1998 113143014Swollman -6:00 - CST 1998 Apr Sun>=1 3:00 113243014Swollman -7:00 Mexico M%sT 113358787Sru# Sonora 113458787SruZone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 113558787Sru -7:00 - MST 1927 Jun 10 23:00 113658787Sru -6:00 - CST 1930 Nov 15 113758787Sru -7:00 - MST 1931 May 1 23:00 113858787Sru -6:00 - CST 1931 Oct 113958787Sru -7:00 - MST 1932 Mar 30 23:00 114064499Swollman -6:00 - CST 1942 Apr 24 114158787Sru -7:00 - MST 1949 Jan 14 114258787Sru -8:00 - PST 1970 114358787Sru -7:00 Mexico M%sT 1999 114458787Sru -7:00 - MST 114564499Swollman# Baja California Sur, Nayarit, Sinaloa 11462742SwollmanZone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 11472742Swollman -7:00 - MST 1927 Jun 10 23:00 11482742Swollman -6:00 - CST 1930 Nov 15 11492742Swollman -7:00 - MST 1931 May 1 23:00 11502742Swollman -6:00 - CST 1931 Oct 11512742Swollman -7:00 - MST 1932 Mar 30 23:00 115264499Swollman -6:00 - CST 1942 Apr 24 11532742Swollman -7:00 - MST 1949 Jan 14 11542742Swollman -8:00 - PST 1970 115514343Swollman -7:00 Mexico M%sT 115658787Sru# Baja California 11572742SwollmanZone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 11582742Swollman -8:00 - PST 1927 Jun 10 23:00 11592742Swollman -7:00 - MST 1930 Nov 16 116064499Swollman -8:00 - PST 1942 Apr 24 11612742Swollman -7:00 - MST 1949 Jan 14 116258787Sru -8:00 BajaN P%sT 1976 116314343Swollman -8:00 US P%sT 1996 116414343Swollman -8:00 Mexico P%sT 11652742Swollman# 11662742Swollman# Revillagigedo Is 11672742Swollman# no information 11682742Swollman 11692742Swollman############################################################################### 11702742Swollman 11712742Swollman# Anguilla 11722742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11732742SwollmanZone America/Anguilla -4:12:16 - LMT 1912 Mar 2 11742742Swollman -4:00 - AST 11752742Swollman 11762742Swollman# Antigua and Barbuda 11772742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11782742SwollmanZone America/Antigua -4:07:12 - LMT 1912 Mar 2 11792742Swollman -5:00 - EST 1951 11802742Swollman -4:00 - AST 11812742Swollman 11822742Swollman# Bahamas 11832742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11842742SwollmanRule Bahamas 1964 max - Oct lastSun 2:00 0 S 11852742SwollmanRule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 11862742SwollmanRule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 11872742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11882742SwollmanZone America/Nassau -5:09:24 - LMT 1912 Mar 2 11892742Swollman -5:00 Bahamas E%sT 11902742Swollman 11912742Swollman# Barbados 11922742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11932742SwollmanRule Barb 1977 only - Jun 12 2:00 1:00 D 11942742SwollmanRule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 11952742SwollmanRule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 11962742SwollmanRule Barb 1979 only - Sep 30 2:00 0 S 11972742SwollmanRule Barb 1980 only - Sep 25 2:00 0 S 11982742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11992742SwollmanZone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 120043014Swollman -3:58:28 - BMT 1932 # Bridgetown Mean Time 12012742Swollman -4:00 Barb A%sT 12022742Swollman 12032742Swollman# Belize 12042742Swollman# Whitman entirely disagrees with Shanks; go with Shanks. 12052742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12062742SwollmanRule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 12072742SwollmanRule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 12082742SwollmanRule Belize 1973 only - Dec 5 0:00 1:00 D 12092742SwollmanRule Belize 1974 only - Feb 9 0:00 0 S 12102742SwollmanRule Belize 1982 only - Dec 18 0:00 1:00 D 12112742SwollmanRule Belize 1983 only - Feb 12 0:00 0 S 12122742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12132742SwollmanZone America/Belize -5:52:48 - LMT 1912 Apr 12142742Swollman -6:00 Belize C%sT 12152742Swollman 12162742Swollman# Bermuda 12172742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12182742SwollmanZone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 12192742Swollman -4:00 - AST 1974 Apr 28 2:00 12202742Swollman -4:00 Bahamas A%sT 12212742Swollman 12222742Swollman# Cayman Is 12232742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12242742SwollmanZone America/Cayman -5:25:32 - LMT 1890 # Georgetown 122543014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 12262742Swollman -5:00 - EST 12272742Swollman 12282742Swollman# Costa Rica 12292742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12302742SwollmanRule CR 1979 1980 - Feb lastSun 0:00 1:00 D 12312742SwollmanRule CR 1979 1980 - Jun Sun>=1 0:00 0 S 123220094SwollmanRule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 123320094Swollman# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 123420094SwollmanRule CR 1991 only - Jul 1 0:00 0 S 123520094SwollmanRule CR 1992 only - Mar 15 0:00 0 S 12362742Swollman# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 12372742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12382742SwollmanZone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 123958787Sru -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 12402742Swollman -6:00 CR C%sT 12412742Swollman# Coco 12422742Swollman# no information; probably like America/Costa_Rica 12432742Swollman 12442742Swollman# Cuba 12452742Swollman 124658787Sru# From Arthur David Olson (1999-03-29): 124758787Sru# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 124858787Sru# the Cuban National Team and the Baltimore Orioles was carried live on 124958787Sru# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 125058787Sru# During the game, play-by-play announcer Jim Hunter noted that 125158787Sru# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 125258787Sru# Time today." (The "two hour" remark referred to losing one hour of 125358787Sru# sleep on 1999-03-28--when the announcers were in Cuba as it switched 125458787Sru# to DST--and one more hour on 1999-04-04--when the announcers will have 125558787Sru# returned to Baltimore, which switches on that date.) 12562742Swollman 12572742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12582742SwollmanRule Cuba 1928 only - Jun 10 0:00 1:00 D 12592742SwollmanRule Cuba 1928 only - Oct 10 0:00 0 S 12602742SwollmanRule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 12612742SwollmanRule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 12622742SwollmanRule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 12632742SwollmanRule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 12642742SwollmanRule Cuba 1965 only - Jun 1 0:00 1:00 D 12652742SwollmanRule Cuba 1965 only - Sep 30 0:00 0 S 12662742SwollmanRule Cuba 1966 only - May 29 0:00 1:00 D 12672742SwollmanRule Cuba 1966 only - Oct 2 0:00 0 S 12682742SwollmanRule Cuba 1967 only - Apr 8 0:00 1:00 D 12692742SwollmanRule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 12702742SwollmanRule Cuba 1968 only - Apr 14 0:00 1:00 D 12712742SwollmanRule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 12722742SwollmanRule Cuba 1969 1971 - Oct lastSun 0:00 0 S 12732742SwollmanRule Cuba 1972 1974 - Oct 8 0:00 0 S 12742742SwollmanRule Cuba 1975 1977 - Oct lastSun 0:00 0 S 12752742SwollmanRule Cuba 1978 only - May 7 0:00 1:00 D 127630711SwollmanRule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 12772742SwollmanRule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 12782742SwollmanRule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 12792742SwollmanRule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 128043014SwollmanRule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 128120094SwollmanRule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 128243014SwollmanRule Cuba 1996 only - Oct 6 0:00s 0 S 128343014SwollmanRule Cuba 1997 only - Oct 12 0:00s 0 S 128458787SruRule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 128543014SwollmanRule Cuba 1998 max - Oct lastSun 0:00s 0 S 128658787SruRule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 12872742Swollman 12882742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12892742SwollmanZone America/Havana -5:29:28 - LMT 1890 129058787Sru -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 12912742Swollman -5:00 Cuba C%sT 12922742Swollman 12932742Swollman# Dominica 12942742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12952742SwollmanZone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 12962742Swollman -4:00 - AST 12972742Swollman 12982742Swollman# Dominican Republic 12992742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 13002742SwollmanRule DR 1966 only - Oct 30 0:00 1:00 D 13012742SwollmanRule DR 1967 only - Feb 28 0:00 0 S 13022742SwollmanRule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 13032742SwollmanRule DR 1970 only - Feb 21 0:00 0 S 13042742SwollmanRule DR 1971 only - Jan 20 0:00 0 S 13052742SwollmanRule DR 1972 1974 - Jan 21 0:00 0 S 13062742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13072742SwollmanZone America/Santo_Domingo -4:39:36 - LMT 1890 13082742Swollman -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 13092742Swollman -5:00 DR E%sT 1974 Oct 27 13102742Swollman -4:00 - AST 13112742Swollman 13122742Swollman# El Salvador 13132742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 13142742SwollmanRule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 13152742SwollmanRule Salv 1987 1988 - Sep lastSun 0:00 0 S 13162742Swollman# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 13172742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13182742SwollmanZone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 13192742Swollman -6:00 Salv C%sT 13202742Swollman 13212742Swollman# Grenada 13222742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 132319878SwollmanZone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 13242742Swollman -4:00 - AST 13252742Swollman 13262742Swollman# Guadeloupe 13272742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13282742SwollmanZone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 13292742Swollman -4:00 - AST 13302742Swollman 13312742Swollman# Guatemala 13322742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 13332742SwollmanRule Guat 1973 only - Nov 25 0:00 1:00 D 13342742SwollmanRule Guat 1974 only - Feb 24 0:00 0 S 13352742SwollmanRule Guat 1983 only - May 21 0:00 1:00 D 13362742SwollmanRule Guat 1983 only - Sep 22 0:00 0 S 133720094SwollmanRule Guat 1991 only - Mar 23 0:00 1:00 D 133820094SwollmanRule Guat 1991 only - Sep 7 0:00 0 S 13392742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13402742SwollmanZone America/Guatemala -6:02:04 - LMT 1918 Oct 5 13412742Swollman -6:00 Guat C%sT 13422742Swollman 13432742Swollman# Haiti 13442742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 13452742SwollmanRule Haiti 1983 only - May 8 0:00 1:00 D 13462742SwollmanRule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 13472742SwollmanRule Haiti 1983 1987 - Oct lastSun 0:00 0 S 134858787Sru# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 134943014SwollmanRule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 135043014SwollmanRule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 13512742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13522742SwollmanZone America/Port-au-Prince -4:49:20 - LMT 1890 13532742Swollman -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 13542742Swollman -5:00 Haiti E%sT 13552742Swollman 13562742Swollman# Honduras 13572742Swollman# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 13582742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13592742SwollmanZone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 13602742Swollman -6:00 Salv C%sT 136143543Swollman# 136243543Swollman# Great Swan I ceded by US to Honduras in 1972 13632742Swollman 13642742Swollman# Jamaica 13652742Swollman 136619878Swollman# From Bob Devine (1988-01-28): 13672742Swollman# Follows US rules. 13682742Swollman 136919878Swollman# From U. S. Naval Observatory (1989-01-19): 13702742Swollman# JAMAICA 5 H BEHIND UTC 13712742Swollman 137258787Sru# From Shanks: 13732742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13742742SwollmanZone America/Jamaica -5:07:12 - LMT 1890 # Kingston 137543014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 137658787Sru -5:00 - EST 1974 Apr 28 2:00 137720094Swollman -5:00 US E%sT 1984 137820094Swollman -5:00 - EST 13792742Swollman 13802742Swollman# Martinique 13812742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13822742SwollmanZone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 13832742Swollman -4:04 - FFMT 1911 May # Fort-de-France MT 13842742Swollman -4:00 - AST 1980 Apr 6 13852742Swollman -4:00 1:00 ADT 1980 Sep 28 13862742Swollman -4:00 - AST 13872742Swollman 13882742Swollman# Montserrat 138930711Swollman# From Paul Eggert (1997-08-31): 139030711Swollman# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 139130711Swollman# Luckily, Olveston, the current de facto capital, has the same longitude. 13922742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 139330711SwollmanZone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 13942742Swollman -4:00 - AST 13952742Swollman 13962742Swollman# Nicaragua 139743543Swollman# 139843543Swollman# From Steffen Thorsen (1998-12-29): 139943543Swollman# Nicaragua seems to be back at -6:00 but I have not been able to find when 140043543Swollman# they changed from -5:00. 140143543Swollman# 14022742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 14032742SwollmanRule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 14042742SwollmanRule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 140520094SwollmanRule Nic 1992 only - Jan 1 4:00 1:00 D 140620094SwollmanRule Nic 1992 only - Sep 24 0:00 0 S 14072742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14082742SwollmanZone America/Managua -5:45:08 - LMT 1890 14092742Swollman -5:45 - MMT 1934 Jun 23 # Managua Mean Time 14102742Swollman -6:00 - CST 1973 May 14112742Swollman -5:00 - EST 1975 Feb 16 141220094Swollman -6:00 Nic C%sT 1993 Jan 1 4:00 141343543Swollman -5:00 - EST 1998 Dec 141443543Swollman -6:00 - CST 14152742Swollman 14162742Swollman# Panama 14172742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14182742SwollmanZone America/Panama -5:18:08 - LMT 1890 14192742Swollman -5:20 - PMT 1908 Apr 22 # Panama Mean Time 14202742Swollman -5:00 - EST 14212742Swollman 14222742Swollman# Puerto Rico 14232742Swollman# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 14242742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 142514343SwollmanZone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 14262742Swollman -4:00 - AST 1942 May 3 142714343Swollman -4:00 1:00 AWT 1945 Sep 30 2:00 14282742Swollman -4:00 - AST 14292742Swollman 14302742Swollman# St Kitts-Nevis 14312742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14322742SwollmanZone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 14332742Swollman -4:00 - AST 14342742Swollman 14352742Swollman# St Lucia 14362742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14372742SwollmanZone America/St_Lucia -4:04:00 - LMT 1890 # Castries 14382742Swollman -4:04 - CMT 1912 # Castries Mean Time 14392742Swollman -4:00 - AST 14402742Swollman 14412742Swollman# St Pierre and Miquelon 14422742Swollman# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 14432742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14442742SwollmanZone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 14452742Swollman -4:00 - AST 1980 May 144619878Swollman -3:00 Mont PM%sT # Pierre & Miquelon Time 14472742Swollman 14482742Swollman# St Vincent and the Grenadines 14492742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14502742SwollmanZone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 145143014Swollman -4:04:56 - KMT 1912 # Kingstown Mean Time 14522742Swollman -4:00 - AST 14532742Swollman 14542742Swollman# Turks and Caicos 145543014Swollman# From Paul Eggert (1998-08-06): 145643014Swollman# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 145720094Swollman# says they switch at midnight. Go with IATA SSIM. 145820094Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 145920094SwollmanRule TC 1979 1986 - Apr lastSun 0:00 1:00 D 146020094SwollmanRule TC 1979 max - Oct lastSun 0:00 0 S 146120094SwollmanRule TC 1987 max - Apr Sun>=1 0:00 1:00 D 14622742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14632742SwollmanZone America/Grand_Turk -4:44:32 - LMT 1890 146443014Swollman -5:07:12 - KMT 1912 Feb # Kingston Mean Time 146520094Swollman -5:00 TC E%sT 14668029Swollman 146714343Swollman# British Virgin Is 14682742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 146914343SwollmanZone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 14702742Swollman -4:00 - AST 14718029Swollman 147214343Swollman# Virgin Is 147314343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 147414343SwollmanZone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 147514343Swollman -4:00 - AST 1476