northamerica revision 30711
130711Swollman# @(#)northamerica 7.32 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 819878Swollman# From Paul Eggert <eggert@twinsun.com> (1994-08-17): 92742Swollman# A reliable and entertaining source about time zones is 102742Swollman# Derek Howse, Greenwich time and the discovery of the longitude, 112742Swollman# Oxford University Press (1980). 122742Swollman 132742Swollman############################################################################### 142742Swollman 152742Swollman# United States 162742Swollman 1714343Swollman# From Paul Eggert <eggert@twinsun.com> (1995-12-19): 1814343Swollman# A good source for time zone historical data in the US is 1914343Swollman# Thomas G. Shanks, The American Atlas (5th edition), 2014343Swollman# San Diego: ACS Publications, Inc. (1991). 2114343Swollman# Make sure you have the errata sheet; the book is somewhat useless without it. 2214343Swollman# It is the source for the US and Puerto Rico entries below. 2314343Swollman 2417200Swollman# From Paul Eggert (1996-06-12): 2517200Swollman# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 2617200Swollman# in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784). 2717200Swollman# Not everyone is happy with the results: 2817200Swollman# 2917200Swollman# I don't really care how time is reckoned so long as there is some 3017200Swollman# agreement about it, but I object to being told that I am saving 3117200Swollman# daylight when my reason tells me that I am doing nothing of the kind. 3217200Swollman# I even object to the implication that I am wasting something 3317200Swollman# valuable if I stay in bed after the sun has risen. As an admirer 3417200Swollman# of moonlight I resent the bossy insistence of those who want to 3517200Swollman# reduce my time for enjoying it. At the back of the Daylight Saving 3617200Swollman# scheme I detect the bony, blue-fingered hand of Puritanism, eager 3717200Swollman# to push people into bed earlier, and get them up earlier, to make 3817200Swollman# them healthy, wealthy and wise in spite of themselves. 3917200Swollman# 4017200Swollman# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 4117200Swollman 422742Swollman# From Arthur David Olson: 432742Swollman# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 4419878Swollman# See, for example, the front page of the Saturday, 1974-10-26 4519878Swollman# and Sunday, 1974-10-27 editions of the Washington Post. 462742Swollman 472742Swollman# From Arthur David Olson: 482742Swollman# Before the Uniform Time Act of 1966 took effect in 1967, observance of 492742Swollman# Daylight Saving Time in the US was by local option, except during wartime. 502742Swollman 512742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5214343SwollmanRule US 1918 1919 - Mar lastSun 2:00 1:00 W # War 532742SwollmanRule US 1918 1919 - Oct lastSun 2:00 0 S 542742SwollmanRule US 1942 only - Feb 9 2:00 1:00 W # War 552742SwollmanRule US 1945 only - Sep 30 2:00 0 S 562742SwollmanRule US 1967 max - Oct lastSun 2:00 0 S 572742SwollmanRule US 1967 1973 - Apr lastSun 2:00 1:00 D 582742SwollmanRule US 1974 only - Jan 6 2:00 1:00 D 592742SwollmanRule US 1975 only - Feb 23 2:00 1:00 D 602742SwollmanRule US 1976 1986 - Apr lastSun 2:00 1:00 D 612742SwollmanRule US 1987 max - Apr Sun>=1 2:00 1:00 D 622742Swollman 6319878Swollman# From Bob Devine (1988-01-28): 642742Swollman# ...Alaska (and Hawaii) had the timezone names changed in 1967. 652742Swollman# old new 662742Swollman# Pacific Standard Time(PST) -same- 672742Swollman# Yukon Standard Time(YST) -same- 682742Swollman# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 692742Swollman# Nome Standard Time (NT) Bering Standard Time (BST) 702742Swollman# 712742Swollman# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 722742Swollman# The YST zone now covers nearly all of the state, AHST just part 732742Swollman# of the Aleutian islands. No DST. 742742Swollman 7514343Swollman# From Paul Eggert (1995-12-19): 7614343Swollman# The tables below use `NST', not `NT', for Nome Standard Time. 7714343Swollman# I invented `CAWT' for Central Alaska War Time. 7814343Swollman 7919878Swollman# From U. S. Naval Observatory (1989-01-19): 802742Swollman# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 812742Swollman# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 822742Swollman# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 832742Swollman# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 842742Swollman# USA MOUNTAIN 7 H BEHIND UTC DENVER 852742Swollman# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 862742Swollman# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 872742Swollman# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 882742Swollman# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 892742Swollman# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 902742Swollman# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 912742Swollman# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 922742Swollman# USA HAWAII 10 H BEHIND UTC 932742Swollman# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 942742Swollman 9519878Swollman# From Arthur David Olson (1989-01-21): 962742Swollman# The above dates are for 1988. 972742Swollman# Note the "AKST" and "AKDT" abbreviations, the claim that there's 982742Swollman# no DST in Samoa, and the claim that there is DST in Alaska and the 992742Swollman# Aleutians. 1002742Swollman 10119878Swollman# From Arthur David Olson (1988-02-13): 1022742Swollman# Legal standard time zone names, from United States Code (1982 Edition and 1032742Swollman# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 10419878Swollman# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 1052742Swollman# took effect), as explained in sections 263 and 261: 1062742Swollman# (none) 1072742Swollman# United States standard eastern time 1082742Swollman# United States standard mountain time 1092742Swollman# United States standard central time 1102742Swollman# United States standard Pacific time 1112742Swollman# (none) 1122742Swollman# United States standard Alaska time 1132742Swollman# (none) 11419878Swollman# Next, names from 1967-04-01 until 1983-11-30 (the date for 1152742Swollman# public law 98-181): 1162742Swollman# Atlantic standard time 1172742Swollman# eastern standard time 1182742Swollman# central standard time 1192742Swollman# mountain standard time 1202742Swollman# Pacific standard time 1212742Swollman# Yukon standard time 1222742Swollman# Alaska-Hawaii standard time 1232742Swollman# Bering standard time 12419878Swollman# And after 1983-11-30: 1252742Swollman# Atlantic standard time 1262742Swollman# eastern standard time 1272742Swollman# central standard time 1282742Swollman# mountain standard time 1292742Swollman# Pacific standard time 1302742Swollman# Alaska standard time 1312742Swollman# Hawaii-Aleutian standard time 1322742Swollman# Samoa standard time 1332742Swollman# The law doesn't give abbreviations. 13414343Swollman# 13514343Swollman# From Paul Eggert (1995-12-19): 13614343Swollman# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. 13714343Swollman# Go with Shanks. 1382742Swollman 13914343Swollman# US Eastern time, represented by New York 14014343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 14114343SwollmanRule NYC 1920 only - Mar lastSun 2:00 1:00 D 14214343SwollmanRule NYC 1920 only - Oct lastSun 2:00 0 S 14314343SwollmanRule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 14414343SwollmanRule NYC 1921 1954 - Sep lastSun 2:00 0 S 14514343SwollmanRule NYC 1955 1966 - Oct lastSun 2:00 0 S 14614343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 14714343SwollmanZone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 14814343Swollman -5:00 US E%sT 1920 14914343Swollman -5:00 NYC E%sT 1942 15014343Swollman -5:00 US E%sT 1946 15114343Swollman -5:00 NYC E%sT 1967 15214343Swollman -5:00 US E%sT 1532742Swollman 15414343Swollman# US Central time, represented by Chicago 15514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 15614343SwollmanRule Chicago 1920 only - Jun 13 2:00 1:00 D 15714343SwollmanRule Chicago 1920 1921 - Oct lastSun 2:00 0 S 15814343SwollmanRule Chicago 1921 only - Mar lastSun 2:00 1:00 D 15914343SwollmanRule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 16014343SwollmanRule Chicago 1922 1954 - Sep lastSun 2:00 0 S 16114343SwollmanRule Chicago 1955 1966 - Oct lastSun 2:00 0 S 16214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 16314343SwollmanZone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 16414343Swollman -6:00 US C%sT 1920 16514343Swollman -6:00 Chicago C%sT 1936 Mar 1 2:00 16614343Swollman -5:00 - EST 1936 Nov 15 2:00 16714343Swollman -6:00 Chicago C%sT 1942 16814343Swollman -6:00 US C%sT 1946 16914343Swollman -6:00 Chicago C%sT 1967 17014343Swollman -6:00 US C%sT 1712742Swollman 17214343Swollman# US Mountain time, represented by Denver 17314343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 17414343SwollmanRule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 17514343SwollmanRule Denver 1920 only - Oct lastSun 2:00 0 S 17614343SwollmanRule Denver 1921 only - May 22 2:00 0 S 17714343SwollmanRule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 17814343SwollmanRule Denver 1965 1966 - Oct lastSun 2:00 0 S 1792742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 18014343SwollmanZone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 18115309Swollman -7:00 US M%sT 1920 18215309Swollman -7:00 Denver M%sT 1942 18315309Swollman -7:00 US M%sT 1946 18415309Swollman -7:00 Denver M%sT 1967 18515309Swollman -7:00 US M%sT 1862742Swollman 18714343Swollman# US Pacific time, represented by Los Angeles 18814343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 18914343SwollmanRule CA 1948 only - Mar 14 2:00 1:00 D 19014343SwollmanRule CA 1949 only - Jan 1 2:00 0 S 19114343SwollmanRule CA 1950 1966 - Apr lastSun 2:00 1:00 D 19214343SwollmanRule CA 1950 1961 - Sep lastSun 2:00 0 S 19314343SwollmanRule CA 1962 1966 - Oct lastSun 2:00 0 S 19414343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 19514343SwollmanZone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 19614343Swollman -8:00 US P%sT 1946 19714343Swollman -8:00 CA P%sT 1967 19814343Swollman -8:00 US P%sT 1998029Swollman 20014343Swollman# Alaska 20114343Swollman# AK%sT is the modern abbreviation for -9:00 per USNO. 20214343Swollman# 20314343Swollman# From Paul Eggert (1995-12-19): 20414343Swollman# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 20519878Swollman# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 20619878Swollman# This was on 1867-10-18. We omit this transition, since we can't represent 20719878Swollman# changes from Julian to Gregorian. 20814343Swollman# 20914343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 21014343SwollmanZone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 21114343Swollman -8:00 - PST 1942 21214343Swollman -8:00 US P%sT 1946 21314343Swollman -8:00 - PST 1969 21414343Swollman -8:00 US P%sT 1983 Oct 30 2:00 21514343Swollman -9:00 US AK%sT 21614343SwollmanZone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 21714343Swollman -9:00 - YST 1942 21814343Swollman -9:00 US Y%sT 1946 21914343Swollman -9:00 - YST 1969 22014343Swollman -9:00 US Y%sT 1983 Oct 30 2:00 22114343Swollman -9:00 US AK%sT 22214343SwollmanZone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 22314343Swollman -10:00 - CAT 1942 22414343Swollman -10:00 US CAT/CAWT 1946 22514343Swollman -10:00 - CAT 1967 Apr 22614343Swollman -10:00 - AHST 1969 22714343Swollman -10:00 US AH%sT 1983 Oct 30 2:00 22814343Swollman -9:00 US AK%sT 22914343SwollmanZone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 23014343Swollman -11:00 - NST 1942 23114343Swollman -11:00 US N%sT 1946 23214343Swollman -11:00 - NST 1967 Apr 23314343Swollman -11:00 - BST 1969 23414343Swollman -11:00 US B%sT 1983 Oct 30 2:00 23514343Swollman -9:00 US AK%sT 23614343SwollmanZone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 23714343Swollman -11:00 - NST 1942 23814343Swollman -11:00 US N%sT 1946 23914343Swollman -11:00 - NST 1967 Apr 24014343Swollman -11:00 - BST 1969 24114343Swollman -11:00 US B%sT 1983 Oct 30 2:00 24214343Swollman -10:00 US HA%sT 24314343Swollman# Shanks writes that part of southwest Alaska (e.g. Aniak) 24414343Swollman# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 24514343Swollman# and another part (e.g. Akiak) made the same switch five weeks later. 24614343Swollman# These switches don't quite make our 1970 cutoff. 2472742Swollman 24814343Swollman# Hawaii 24914343Swollman# 25014343Swollman# From Arthur David Olson: 25114343Swollman# And then there's Hawaii. 25214343Swollman# DST was observed for one day in 1933; 25314343Swollman# standard time was changed by half an hour in 1947; 25414343Swollman# it's always standard as of 1986. 25514343Swollman# 25614343Swollman# From Paul Eggert: 25714343Swollman# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 25814343Swollman# 25914343SwollmanZone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 26014343Swollman -10:30 - HST 1933 Apr 30 2:00 26114343Swollman -10:30 1:00 HDT 1933 May 21 2:00 26214343Swollman -10:30 US H%sT 1947 Jun 8 2:00 26314343Swollman -10:00 - HST 2642742Swollman 26514343SwollmanZone Pacific/Midway -11:49:28 - LMT 1901 26614343Swollman -11:00 - NST 1967 Apr # N=Nome 26714343Swollman -11:00 - BST 1983 Nov 30 # B=Bering 26814343Swollman -11:00 - SST # S=Samoa 26914343Swollman 27014343Swollman# Now we turn to US areas that have diverged from the consensus since 1970. 27114343Swollman 27214343Swollman# Arizona mostly uses MST. 27314343SwollmanZone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 27414343Swollman -7:00 US M%sT 1944 Jan 1 00:01 27514343Swollman -7:00 - MST 1944 Mar 17 00:01 27614343Swollman -7:00 US M%sT 1944 Oct 1 00:01 27714343Swollman -7:00 - MST 1967 27814343Swollman -7:00 US M%sT 1968 27914343Swollman -7:00 - MST 28019878Swollman# From Arthur David Olson (1988-02-13): 28114343Swollman# A writer from the Inter Tribal Council of Arizona, Inc., 2822742Swollman# notes in private correspondence dated 12/28/87 that "Presently, only the 2832742Swollman# Navajo Nation participates in the Daylight Saving Time policy, due to its 2842742Swollman# large size and location in three states." (The "only" means that other 2852742Swollman# tribal nations don't use DST.) 2862742Swollman 28714343SwollmanLink America/Denver America/Shiprock 2882742Swollman 28914343Swollman# Southern Idaho and eastern Oregon switched four weeks late in 1974. 29014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 29114343SwollmanZone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 29214343Swollman -8:00 US P%sT 1923 May 13 2:00 29314343Swollman -7:00 US M%sT 1974 29414343Swollman -7:00 - MST 1974 Feb 3 2:00 29514343Swollman -7:00 US M%sT 2962742Swollman 29714343Swollman# Indiana 29814343Swollman# 29914343Swollman# From Paul Eggert (1995-12-19): 30014343Swollman# Indiana generally observes either EST all year, or CST/CDT, 30114343Swollman# but areas near Cincinnati and Louisville use those cities' timekeeping 30214343Swollman# and in 1969 and 1970 the whole state observed daylight time; 30314343Swollman# and there are other exceptions as noted below. 30414343Swollman# Shanks partitions Indiana into 345 regions, each with its own time history, 30514343Swollman# and writes ``Even newspaper reports present contradictory information.'' 30614343Swollman# Fortunately, most of the complexity occurred before our cutoff date of 1970. 30714343Swollman# 30814343Swollman# Since 1970, EST-only Indiana has been like America/Indianapolis, 30914343Swollman# with exceptions noted below for Crawford, Starke, and Switzerland counties. 31014343Swollman# The parts of Indiana not listed below have been like America/Chicago, 31114343Swollman# America/Louisville, or America/New_York. 31214343Swollman# 31314343Swollman# Other than Indianapolis, the Indiana place names are so nondescript 31414343Swollman# that they would be ambiguous if we left them at the `America' level. 31514343Swollman# So we reluctantly put them all in a subdirectory `America/Indiana'. 31614343Swollman# 31714343Swollman# Most of EST-only Indiana last observed DST in 1970. 31814343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 31914343SwollmanRule Indianapolis 1941 only - Jun 22 2:00 1:00 D 32014343SwollmanRule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 32114343SwollmanRule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 32214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 32314343SwollmanZone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 32414343Swollman -6:00 US C%sT 1920 32514343Swollman -6:00 Indianapolis C%sT 1942 32614343Swollman -6:00 US C%sT 1946 32714343Swollman -6:00 Indianapolis C%sT 1955 Apr 24 2:00 32814343Swollman -5:00 - EST 1957 Sep 29 2:00 32914343Swollman -6:00 - CST 1958 Apr 27 2:00 33014343Swollman -5:00 - EST 1969 33114343Swollman -5:00 US E%sT 1971 33214343Swollman -5:00 - EST 33314343SwollmanLink America/Indianapolis America/Indiana/Indianapolis 3342742Swollman# 33514343Swollman# Part of Crawford County, Indiana, last observed DST in 1975, 33614343Swollman# and left its clocks alone in 1974. 33714343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 33814343SwollmanRule Marengo 1951 only - Apr lastSun 2:00 1:00 D 33914343SwollmanRule Marengo 1951 only - Sep lastSun 2:00 0 S 34014343SwollmanRule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 34114343SwollmanRule Marengo 1954 1960 - Sep lastSun 2:00 0 S 34214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 34314343SwollmanZone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 34414343Swollman -6:00 US C%sT 1951 34514343Swollman -6:00 Marengo C%sT 1961 Apr 30 2:00 34614343Swollman -5:00 - EST 1969 34714343Swollman -5:00 US E%sT 1974 Jan 6 2:00 34814343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 34914343Swollman -5:00 US E%sT 1976 35014343Swollman -5:00 - EST 35114343Swollman# 35214343Swollman# Starke County, Indiana 35319878Swollman# From Arthur David Olson (1991-10-28): 35419878Swollman# An article on page A3 of the Sunday, 1991-10-27 Washington Post 35514343Swollman# notes that Starke County switched from Central time to Eastern time as of 35619878Swollman# 1991-10-27. 35714343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 35814343SwollmanRule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 35914343SwollmanRule Starke 1947 1954 - Sep lastSun 2:00 0 S 36014343SwollmanRule Starke 1955 1956 - Oct lastSun 2:00 0 S 36114343SwollmanRule Starke 1957 1958 - Sep lastSun 2:00 0 S 36214343SwollmanRule Starke 1959 1961 - Oct lastSun 2:00 0 S 36314343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 36414343SwollmanZone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 36514343Swollman -6:00 US C%sT 1947 36614343Swollman -6:00 Starke C%sT 1962 Apr 29 2:00 36714343Swollman -5:00 - EST 1963 Oct 27 2:00 36814343Swollman -6:00 US C%sT 1991 Oct 27 2:00 36914343Swollman -5:00 - EST 37014343Swollman# 37114343Swollman# Switzerland County, Indiana, last observed DST in 1972. 37214343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 37314343SwollmanZone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 37414343Swollman -6:00 US C%sT 1954 Apr 25 2:00 37514343Swollman -5:00 - EST 1969 37614343Swollman -5:00 US E%sT 1973 37714343Swollman -5:00 - EST 3782742Swollman 37914343Swollman# Part of Kentucky left its clocks alone in 1974. 38014343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 38114343SwollmanRule Louisville 1921 only - May 1 2:00 1:00 D 38214343SwollmanRule Louisville 1921 only - Sep 1 2:00 0 S 38314343SwollmanRule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 38414343SwollmanRule Louisville 1941 only - Sep lastSun 2:00 0 S 38514343SwollmanRule Louisville 1946 only - Jun 2 2:00 0 S 38614343SwollmanRule Louisville 1950 1955 - Sep lastSun 2:00 0 S 38714343SwollmanRule Louisville 1956 1960 - Oct lastSun 2:00 0 S 38814343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 38914343SwollmanZone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 39014343Swollman -6:00 US C%sT 1921 39114343Swollman -6:00 Louisville C%sT 1942 39214343Swollman -6:00 US C%sT 1946 39314343Swollman -6:00 Louisville C%sT 1961 Jul 23 2:00 39414343Swollman -5:00 - EST 1968 39514343Swollman -5:00 US E%sT 1974 Jan 6 2:00 39614343Swollman -6:00 1:00 CDT 1974 Oct 27 2:00 39714343Swollman -5:00 US E%sT 3982742Swollman 39914343Swollman# Michigan 40014343Swollman# 40119878Swollman# From Bob Devine (1988-01-28): 40214343Swollman# Michigan didn't observe DST from 1968 to 1973. 40314343Swollman# 40414343Swollman# From Paul Eggert (1995-12-19): 40514343Swollman# Shanks writes that Michigan started using standard time on 1885 Sep 18, 40614343Swollman# but Howse (p 126) writes that Detroit kept 40714343Swollman# 40814343Swollman# local time until 1900 when the City Council decreed that clocks should 40914343Swollman# be put back twenty-eight minutes to Central Standard Time. Half the 41014343Swollman# city obeyed, half refused. After considerable debate, the decision 41114343Swollman# was rescinded and the city reverted to Sun time. A derisive offer to 41214343Swollman# erect a sundial in front of the city hall was referred to the 41314343Swollman# Committee on Sewers. Then, in 1905, Central time was adopted 41414343Swollman# by city vote. 41514343Swollman# 41614343Swollman# This story is too entertaining to be false, so go with Howse over Shanks. 41714343Swollman# 41814343Swollman# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 41914343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 42014343SwollmanRule Detroit 1948 only - Apr lastSun 2:00 1:00 D 42114343SwollmanRule Detroit 1948 only - Sep lastSun 2:00 0 S 42214343SwollmanRule Detroit 1967 only - Jun 14 2:00 1:00 D 42314343SwollmanRule Detroit 1967 only - Oct lastSun 2:00 0 S 42414343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 42514343SwollmanZone America/Detroit -5:32:11 - LMT 1905 42614343Swollman -6:00 - CST 1915 May 15 2:00 42714343Swollman -5:00 - EST 1942 42814343Swollman -5:00 US E%sT 1946 42914343Swollman -5:00 Detroit E%sT 1973 43014343Swollman -5:00 US E%sT 1975 43114343Swollman -5:00 - EST 1975 Apr 27 2:00 43214343Swollman -5:00 US E%sT 43314343Swollman# 43414343Swollman# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 43514343Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 43614343SwollmanRule Menominee 1946 only - Apr lastSun 2:00 1:00 D 43714343SwollmanRule Menominee 1946 only - Sep lastSun 2:00 0 S 43814343SwollmanRule Menominee 1966 only - Apr lastSun 2:00 1:00 D 43914343SwollmanRule Menominee 1966 only - Oct lastSun 2:00 0 S 44014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 44114343SwollmanZone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 44214343Swollman -6:00 US C%sT 1946 44314343Swollman -6:00 Menominee C%sT 1969 Apr 27 2:00 44414343Swollman -5:00 - EST 1973 Apr 29 2:00 44514343Swollman -6:00 US C%sT 44614343Swollman 4472742Swollman# Navassa 44814343Swollman# uninhabited 44914343Swollman 4502742Swollman 45119878Swollman# Old names, for S5 users 45219878Swollman 45319878Swollman# Link LINK-FROM LINK-TO 45419878SwollmanLink America/New_York EST5EDT 45519878SwollmanLink America/Chicago CST6CDT 45619878SwollmanLink America/Denver MST7MDT 45719878SwollmanLink America/Los_Angeles PST8PDT 45819878SwollmanLink America/Indianapolis EST 45919878SwollmanLink America/Phoenix MST 46019878SwollmanLink Pacific/Honolulu HST 46119878Swollman 4622742Swollman################################################################################ 4632742Swollman 4642742Swollman 46520094Swollman# From Paul Eggert <eggert@twinsun.com> (1996-11-22): 46614343Swollman# A good source for time zone historical data outside the US is 4672742Swollman# Thomas G. Shanks, The International Atlas (3rd edition), 4682742Swollman# San Diego: ACS Publications, Inc. (1991). 4692742Swollman# 47020094Swollman# Gwillim Law <LAW@encmail.encompass.com> writes that a good source 47120094Swollman# for recent time zone data is the International Air Transport 47220094Swollman# Association's Standard Schedules Information Manual (IATA SSIM), 47320094Swollman# published semiannually. Law sent in several helpful summaries 47420094Swollman# of the IATA's data after 1990. 47520094Swollman# 47620094Swollman# Except where otherwise noted, Shanks is the source for entries through 1990, 47720094Swollman# and IATA SSIM is the source for entries after 1990. 47820094Swollman# 4792742Swollman# Another source occasionally used is Edward W. Whitman, World Time Differences, 4802742Swollman# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 4812742Swollman# I found in the UCLA library. 4822742Swollman# 4839908Swollman# See the `europe' file for Greenland. 4849908Swollman# 48519878Swollman# See the `africa' file for time zone naming and abbreviation conventions. 4862742Swollman 4872742Swollman# Canada 4882742Swollman 4899908Swollman# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 4909908Swollman# I post here the time zone abbreviations standardized in Canada 4919908Swollman# for both English and French in the CAN/CSA-Z234.4-89 standard.... 4929908Swollman# 4939908Swollman# UTC Standard time Daylight savings time 4949908Swollman# offset French English French English 4959908Swollman# -2:30 - - HAT NDT 4969908Swollman# -3 - - HAA ADT 4979908Swollman# -3:30 HNT NST - - 4989908Swollman# -4 HNA AST HAE EDT 4999908Swollman# -5 HNE EST HAC CDT 5009908Swollman# -6 HNC CST HAR MDT 5019908Swollman# -7 HNR MST HAP PDT 5029908Swollman# -8 HNP PST HAY YDT 5039908Swollman# -9 HNY YST - - 5049908Swollman# 5059908Swollman# HN: Heure Normale ST: Standard Time 5069908Swollman# HA: Heure Avanc<e'>e DT: Daylight saving Time 5079908Swollman# 5089908Swollman# A: de l'Atlantique Atlantic 5099908Swollman# C: du Centre Central 5109908Swollman# E: de l'Est Eastern 5119908Swollman# M: Mountain 5129908Swollman# N: Newfoundland 5139908Swollman# P: du Pacifique Pacific 5149908Swollman# R: des Rocheuses 5159908Swollman# T: de Terre-Neuve 5169908Swollman# Y: du Yukon Yukon 5179908Swollman# 5189908Swollman# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 5199908Swollman# Alas, this sort of thing must be handled by localization software. 5202742Swollman 52117200Swollman# The data for Canada are all from Shanks (1991). 5229908Swollman 5239908Swollman 5242742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 52517200SwollmanRule Canada 1918 only - Apr 14 2:00 1:00 D 52617200SwollmanRule Canada 1918 only - Oct 31 2:00 0 S 52717200SwollmanRule Canada 1942 only - Feb 9 2:00 1:00 D 52817200SwollmanRule Canada 1945 only - Sep 30 2:00 0 S 52917200SwollmanRule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 53017200SwollmanRule Canada 1974 max - Oct lastSun 2:00 0 S 53117200SwollmanRule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 53217200Swollman 53317200Swollman 53420094Swollman# Newfoundland (except Labrador) 53517200Swollman 53617200Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5372742SwollmanRule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 5382742SwollmanRule StJohns 1917 only - Sep 17 2:00 0 S 5392742SwollmanRule StJohns 1918 only - Oct 31 2:00 0 S 5402742Swollman# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 5412742SwollmanRule StJohns 1919 only - May 5 23:00 1:00 D 5422742SwollmanRule StJohns 1919 only - Aug 12 23:00 0 S 5432742Swollman# For 1931-1935 Whitman gives Apr same date; go with Shanks. 5442742SwollmanRule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 5452742SwollmanRule StJohns 1920 1935 - Oct lastSun 23:00 0 S 5462742Swollman# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 5472742SwollmanRule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 5482742SwollmanRule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 5492742Swollman# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 5502742SwollmanRule StJohns 1942 only - Mar 1 0:00 1:00 D 5512742SwollmanRule StJohns 1942 only - Dec 31 0:00 0 S 5522742SwollmanRule StJohns 1943 only - May 30 0:00 1:00 D 5532742SwollmanRule StJohns 1943 only - Sep 5 0:00 0 S 5542742SwollmanRule StJohns 1944 only - Jul 10 0:00 1:00 D 5552742SwollmanRule StJohns 1944 only - Sep 2 0:00 0 S 5562742SwollmanRule StJohns 1945 only - Jan 1 0:00 1:00 D 5572742SwollmanRule StJohns 1945 only - Oct 7 2:00 0 S 5582742Swollman# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 5592742Swollman# Apr 30 - Sep 24; go with Shanks. 5602742SwollmanRule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 5612742SwollmanRule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 5622742SwollmanRule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 5632742SwollmanRule StJohns 1951 1959 - Sep lastSun 2:00 0 S 5642742SwollmanRule StJohns 1960 max - Oct lastSun 2:00 0 S 5652742SwollmanRule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 56614343SwollmanRule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD 5672742SwollmanRule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 5682742Swollman# St John's has an apostrophe, but Posix file names can't have apostrophes. 5692742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5702742SwollmanZone America/St_Johns -3:30:52 - LMT 1884 57120094Swollman -3:30:52 StJohns N%sT 1935 Mar 30 5722742Swollman -3:30 StJohns N%sT 5732742Swollman 5748029Swollman 57520094Swollman# east Labrador 57617200Swollman 57720094Swollman# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 57820094Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 57920094SwollmanZone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 58020094Swollman -3:30:52 StJohns NST 1919 58120094Swollman -3:30:52 - NST 1935 Mar 30 58220094Swollman -3:30 - NST 1936 58320094Swollman -3:30 StJohns N%sT 1966 Mar 15 2:00 58420094Swollman -4:00 StJohns A%sT 58520094Swollman 58620094Swollman 58720094Swollman# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 58820094Swollman 58917200Swollman# From Paul Eggert (1996-06-12): 59017200Swollman# Shanks writes that since 1970 most of this region has been like Halifax. 59117200Swollman# Many locales did not observe peacetime DST until 1972; 59217200Swollman# Glace Bay, NS is the largest that we know of. 59317200Swollman# Shanks also writes that Liverpool, NS was the only town in Canada to observe 59417200Swollman# DST in 1971 but not 1970; for now we'll assume this is a typo. 59517200Swollman 5962742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 5972742SwollmanRule Halifax 1916 only - Apr 1 0:00 1:00 D 5982742SwollmanRule Halifax 1916 only - Oct 1 0:00 0 S 5992742SwollmanRule Halifax 1918 only - Apr 14 2:00 1:00 D 6002742SwollmanRule Halifax 1918 only - Oct 31 2:00 0 S 6012742SwollmanRule Halifax 1920 only - May 9 0:00 1:00 D 6022742SwollmanRule Halifax 1920 only - Aug 29 0:00 0 S 6032742SwollmanRule Halifax 1921 only - May 6 0:00 1:00 D 6042742SwollmanRule Halifax 1921 1922 - Sep 5 0:00 0 S 6052742SwollmanRule Halifax 1922 only - Apr 30 0:00 1:00 D 6062742SwollmanRule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 6072742SwollmanRule Halifax 1923 only - Sep 4 0:00 0 S 6082742SwollmanRule Halifax 1924 only - Sep 15 0:00 0 S 6092742SwollmanRule Halifax 1925 only - Sep 28 0:00 0 S 6102742SwollmanRule Halifax 1926 only - May 16 0:00 1:00 D 6112742SwollmanRule Halifax 1926 only - Sep 13 0:00 0 S 6122742SwollmanRule Halifax 1927 only - May 1 0:00 1:00 D 6132742SwollmanRule Halifax 1927 only - Sep 26 0:00 0 S 6142742SwollmanRule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 6152742SwollmanRule Halifax 1928 only - Sep 9 0:00 0 S 6162742SwollmanRule Halifax 1929 only - Sep 3 0:00 0 S 6172742SwollmanRule Halifax 1930 only - Sep 15 0:00 0 S 6182742SwollmanRule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 6192742SwollmanRule Halifax 1933 only - Apr 30 0:00 1:00 D 6202742SwollmanRule Halifax 1933 only - Oct 2 0:00 0 S 6212742SwollmanRule Halifax 1934 only - May 20 0:00 1:00 D 6222742SwollmanRule Halifax 1934 only - Sep 16 0:00 0 S 6232742SwollmanRule Halifax 1935 only - Jun 2 0:00 1:00 D 6242742SwollmanRule Halifax 1935 only - Sep 30 0:00 0 S 6252742SwollmanRule Halifax 1936 only - Jun 1 0:00 1:00 D 6262742SwollmanRule Halifax 1936 only - Sep 14 0:00 0 S 6272742SwollmanRule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 6282742SwollmanRule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 6292742SwollmanRule Halifax 1939 only - May 28 0:00 1:00 D 6302742SwollmanRule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 6312742SwollmanRule Halifax 1942 only - Feb 9 2:00 1:00 D 6322742SwollmanRule Halifax 1945 1959 - Sep lastSun 2:00 0 S 6332742SwollmanRule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 6342742SwollmanRule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 6352742SwollmanRule Halifax 1962 max - Oct lastSun 2:00 0 S 6362742SwollmanRule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 6372742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6382742SwollmanZone America/Halifax -4:14:24 - LMT 1902 Jun 15 6392742Swollman -4:00 Halifax A%sT 64017200SwollmanZone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 64117200Swollman -4:00 Canada A%sT 1953 64217200Swollman -4:00 Halifax A%sT 1954 64317200Swollman -4:00 - AST 1972 64417200Swollman -4:00 Halifax A%sT 6452742Swollman 6468029Swollman 64717200Swollman# Ontario, Quebec 64817200Swollman 64917200Swollman# From Paul Eggert (1996-06-12): 65017200Swollman# Shanks writes that since 1970 most of this region has been like Montreal. 65117200Swollman# Thunder Bay skipped DST in 1973. 65217200Swollman# Many smaller locales did not observe peacetime DST until 1974; 65317200Swollman# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 65417200Swollman# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 65517200Swollman 6562742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6572742SwollmanRule Mont 1917 only - Mar 25 2:00 1:00 D 6582742SwollmanRule Mont 1917 only - Apr 24 0:00 0 S 6592742SwollmanRule Mont 1918 only - Apr 14 2:00 1:00 D 6602742SwollmanRule Mont 1918 only - Oct 31 2:00 0 S 6612742SwollmanRule Mont 1919 only - Mar 31 2:30 1:00 D 6622742SwollmanRule Mont 1919 only - Oct 25 2:30 0 S 6632742SwollmanRule Mont 1920 only - May 2 2:30 1:00 D 6642742SwollmanRule Mont 1920 only - Oct 3 2:30 0 S 6652742SwollmanRule Mont 1921 only - May 1 2:00 1:00 D 6662742SwollmanRule Mont 1921 only - Oct 2 2:30 0 S 6672742SwollmanRule Mont 1922 only - Apr 30 2:00 1:00 D 6682742SwollmanRule Mont 1922 only - Oct 1 2:30 0 S 6692742SwollmanRule Mont 1924 only - May 17 2:00 1:00 D 6702742SwollmanRule Mont 1924 1926 - Sep lastSun 2:30 0 S 6712742SwollmanRule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 6722742SwollmanRule Mont 1927 only - May 1 0:00 1:00 D 6732742SwollmanRule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 6742742SwollmanRule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 6752742SwollmanRule Mont 1932 only - May 1 0:00 1:00 D 6762742SwollmanRule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 6772742SwollmanRule Mont 1933 only - Oct 1 0:00 0 S 6782742SwollmanRule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 6792742SwollmanRule Mont 1945 1948 - Sep lastSun 2:00 0 S 6802742SwollmanRule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 6812742SwollmanRule Mont 1949 1950 - Oct lastSun 2:00 0 S 6822742SwollmanRule Mont 1951 1956 - Sep lastSun 2:00 0 S 6832742SwollmanRule Mont 1957 max - Oct lastSun 2:00 0 S 6842742SwollmanRule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 6852742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6862742SwollmanZone America/Montreal -4:54:16 - LMT 1884 6872742Swollman -5:00 Mont E%sT 68817200SwollmanZone America/Thunder_Bay -5:57:00 - LMT 1895 68917200Swollman -5:00 Canada E%sT 1970 69017200Swollman -5:00 Mont E%sT 1973 69117200Swollman -5:00 - EST 1974 69217200Swollman -5:00 Canada E%sT 69317200SwollmanZone America/Nipigon -5:53:04 - LMT 1895 69417200Swollman -5:00 Canada E%sT 69517200SwollmanZone America/Rainy_River -6:17:56 - LMT 1895 69617200Swollman -6:00 Canada C%sT 6972742Swollman 6988029Swollman 69917200Swollman# Manitoba 70019878Swollman 7012742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7022742SwollmanRule Winn 1916 only - Apr 23 0:00 1:00 D 7032742SwollmanRule Winn 1916 only - Sep 17 0:00 0 S 7042742SwollmanRule Winn 1918 only - Apr 14 2:00 1:00 D 7052742SwollmanRule Winn 1918 only - Oct 31 2:00 0 S 7062742SwollmanRule Winn 1937 only - May 16 2:00 1:00 D 70714343SwollmanRule Winn 1937 only - Sep 26 2:00 0 S 7082742SwollmanRule Winn 1942 only - Feb 9 2:00 1:00 D 7092742SwollmanRule Winn 1945 only - Sep lastSun 2:00 0 S 7102742SwollmanRule Winn 1946 only - May 12 2:00 1:00 D 7112742SwollmanRule Winn 1946 only - Oct 13 2:00 0 S 7122742SwollmanRule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 71314343SwollmanRule Winn 1947 1949 - Sep lastSun 2:00 0 S 71414343SwollmanRule Winn 1950 only - May 1 2:00 1:00 D 71514343SwollmanRule Winn 1950 only - Sep 30 2:00 0 S 71614343SwollmanRule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 71714343SwollmanRule Winn 1951 1958 - Sep lastSun 2:00 0 S 7182742SwollmanRule Winn 1959 only - Oct lastSun 2:00 0 S 7192742SwollmanRule Winn 1960 only - Sep lastSun 2:00 0 S 7202742SwollmanRule Winn 1963 only - Apr lastSun 2:00 1:00 D 72114343SwollmanRule Winn 1963 only - Sep 22 2:00 0 S 7222742SwollmanRule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 72314343SwollmanRule Winn 1966 max - Oct lastSun 2:00 0 S 7242742SwollmanRule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 7252742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 7262742SwollmanZone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 7272742Swollman -6:00 Winn C%sT 7282742Swollman 7298029Swollman 73017200Swollman# Saskatchewan 73117200Swollman 73217200Swollman# From Paul Eggert (1996-06-12): 73317200Swollman# Shanks writes that since 1970 most of this region has been like Regina. 73417200Swollman# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 73517200Swollman# Other western towns (e.g. Lloydminster) are like Edmonton. 73617200Swollman 73719878Swollman# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 73817200Swollman# The. . .below is based on information I got from our law library, the 73917200Swollman# provincial archives, and the provincial Community Services department. 74017200Swollman# A precise history would require digging through newspaper archives, and 74117200Swollman# since you didn't say what you wanted, I didn't bother. 74217200Swollman# 74317200Swollman# Saskatchewan is split by a time zone meridian (105W) and over the years 74417200Swollman# the boundary became pretty ragged as communities near it reevaluated 74517200Swollman# their affiliations in one direction or the other. In 1965 a provincial 74617200Swollman# referendum favoured legislating common time practices. 74717200Swollman# 74817200Swollman# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 74917200Swollman# Saskatchewan 1978) was proclaimed, and established that the eastern 75017200Swollman# part of Saskatchewan would use CST year round, that districts in 75117200Swollman# northwest Saskatchewan would by default follow CST but could opt to 75217200Swollman# follow Mountain Time rules (thus 1 hour difference in the winter and 75317200Swollman# zero in the summer), and that districts in southwest Saskatchewan would 75417200Swollman# by default follow MT but could opt to follow CST. 75517200Swollman# 75617200Swollman# It took a few years for the dust to settle (I know one story of a town 75717200Swollman# on one time zone having its school in another, such that a mom had to 75817200Swollman# serve her family lunch in two shifts), but presently it seems that only 75917200Swollman# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 76017200Swollman# rules any more; all other districts appear to have used CST year round 76117200Swollman# since sometime in the 1960s. 76217200Swollman 7632742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7642742SwollmanRule Regina 1918 only - Apr 14 2:00 1:00 D 7652742SwollmanRule Regina 1918 only - Oct 31 2:00 0 S 7662742SwollmanRule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 7672742SwollmanRule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 7682742SwollmanRule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 7692742SwollmanRule Regina 1937 only - Oct Sun>=8 0:00 0 S 7702742SwollmanRule Regina 1938 only - Oct Sun>=1 0:00 0 S 7712742SwollmanRule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 7722742SwollmanRule Regina 1942 only - Feb 9 2:00 1:00 D 7732742SwollmanRule Regina 1945 only - Sep lastSun 2:00 0 S 77417200SwollmanRule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 77517200SwollmanRule Regina 1946 only - Oct Sun>=8 2:00 0 S 77617200SwollmanRule Regina 1947 1959 - Apr lastSun 2:00 1:00 D 77717200SwollmanRule Regina 1947 1958 - Sep lastSun 2:00 0 S 77817200SwollmanRule Regina 1959 only - Oct lastSun 2:00 0 S 77917200Swollman# 78017200SwollmanRule Swift 1957 only - Apr lastSun 2:00 1:00 D 78117200SwollmanRule Swift 1957 only - Oct lastSun 2:00 0 S 78217200SwollmanRule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 78317200SwollmanRule Swift 1959 only - Oct lastSun 2:00 0 S 78417200SwollmanRule Swift 1960 1961 - Sep lastSun 2:00 0 S 7852742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 78617200SwollmanZone America/Regina -6:58:36 - LMT 1905 Sep 78717200Swollman -7:00 Regina M%sT 1960 Apr lastSun 2:00 7882742Swollman -6:00 - CST 78917200SwollmanZone America/Swift_Current -7:11:20 - LMT 1905 Sep 79017200Swollman -7:00 Canada M%sT 1946 Apr lastSun 2:00 79117200Swollman -7:00 Regina M%sT 1950 79217200Swollman -7:00 Swift M%sT 1972 Apr lastSun 2:00 79317200Swollman -6:00 - CST 7942742Swollman 7958029Swollman 79617200Swollman# Alberta 79717200Swollman 7982742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 7992742SwollmanRule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 8002742SwollmanRule Edm 1918 only - Oct 31 2:00 0 S 8012742SwollmanRule Edm 1919 only - May 27 2:00 0 S 8022742SwollmanRule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 8032742SwollmanRule Edm 1920 only - Oct lastSun 2:00 0 S 8042742SwollmanRule Edm 1921 1923 - Sep lastSun 2:00 0 S 8052742SwollmanRule Edm 1942 only - Feb 9 2:00 1:00 D 8062742SwollmanRule Edm 1945 only - Sep lastSun 2:00 0 S 8072742SwollmanRule Edm 1947 only - Apr lastSun 2:00 1:00 D 8082742SwollmanRule Edm 1947 only - Sep lastSun 2:00 0 S 8092742SwollmanRule Edm 1967 only - Apr lastSun 2:00 1:00 D 8102742SwollmanRule Edm 1967 only - Oct lastSun 2:00 0 S 8112742SwollmanRule Edm 1969 only - Apr lastSun 2:00 1:00 D 8122742SwollmanRule Edm 1969 only - Oct lastSun 2:00 0 S 8132742SwollmanRule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 8142742SwollmanRule Edm 1972 max - Oct lastSun 2:00 0 S 8152742SwollmanRule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 8162742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8172742SwollmanZone America/Edmonton -7:33:52 - LMT 1906 Sep 8182742Swollman -7:00 Edm M%sT 8192742Swollman 8208029Swollman 82117200Swollman# British Columbia 82217200Swollman 82317200Swollman# From Paul Eggert (1996-06-12): 82417200Swollman# Shanks writes that since 1970 most of this region has been like Vancouver. 82517200Swollman# Dawswon Creek uses MST. Much of east BC is like Edmonton. 82617200Swollman 8272742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 8282742SwollmanRule Vanc 1918 only - Apr 14 2:00 1:00 D 8292742SwollmanRule Vanc 1918 only - Oct 31 2:00 0 S 8302742SwollmanRule Vanc 1942 only - Feb 9 2:00 1:00 D 8312742SwollmanRule Vanc 1945 only - Sep 30 2:00 0 S 8322742SwollmanRule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 8332742SwollmanRule Vanc 1946 only - Oct 13 2:00 0 S 8342742SwollmanRule Vanc 1947 1961 - Sep lastSun 2:00 0 S 8352742SwollmanRule Vanc 1962 max - Oct lastSun 2:00 0 S 8362742SwollmanRule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 8372742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 8382742SwollmanZone America/Vancouver -8:12:28 - LMT 1884 8392742Swollman -8:00 Vanc P%sT 84017200SwollmanZone America/Dawson_Creek -8:00:56 - LMT 1884 84117200Swollman -8:00 Canada P%sT 1947 84217200Swollman -8:00 Vanc P%sT 1972 Aug 30 2:00 84317200Swollman -7:00 - MST 8442742Swollman 8458029Swollman 84617200Swollman# Northwest Territories, Yukon 84717200Swollman 84820094Swollman# From Paul Eggert (1996-10-07): 84917200Swollman# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 85017200Swollman# Shanks's table for Watson Lake is corrupted, so we have no data there. 85120094Swollman# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 85220094Swollman# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 85320094Swollman# c. 7 defines Yukon standard time as UTC-9. This is still valid; 85420094Swollman# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 85520094Swollman# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 85620094Swollman# * O.I.C. 1980/02 established DST. 85720094Swollman# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 85820094Swollman# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 85917200Swollman 8602742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 86117200SwollmanRule NT_YK 1918 only - Apr 14 2:00 1:00 D 86217200SwollmanRule NT_YK 1918 only - Oct 27 2:00 0 S 86317200SwollmanRule NT_YK 1919 only - May 25 2:00 1:00 D 86417200SwollmanRule NT_YK 1919 only - Nov 1 0:00 0 S 86517200SwollmanRule NT_YK 1942 only - Feb 9 2:00 1:00 D 86617200SwollmanRule NT_YK 1945 only - Sep 30 2:00 0 S 86717200SwollmanRule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 86817200SwollmanRule NT_YK 1965 only - Oct lastSun 2:00 0 S 86917200SwollmanRule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 87017200SwollmanRule NT_YK 1980 max - Oct lastSun 2:00 0 S 87117200SwollmanRule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 8722742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 87317200SwollmanZone America/Pangnirtung -4:22:56 - LMT 1884 87417200Swollman -4:00 NT_YK A%sT 87517200SwollmanZone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay 87617200Swollman -5:00 NT_YK E%sT 87717200SwollmanZone America/Rankin_Inlet -6:08:40 - LMT 1884 87817200Swollman -6:00 NT_YK C%sT 87917200SwollmanZone America/Yellowknife -7:37:24 - LMT 1884 88017200Swollman -7:00 NT_YK M%sT 88117200SwollmanZone America/Inuvik -8:54:00 - LMT 1884 88217200Swollman -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 88317200Swollman -7:00 NT_YK M%sT 8842742SwollmanZone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 88517200Swollman -9:00 NT_YK Y%sT 1966 Jul 1 2:00 88617200Swollman -8:00 NT_YK P%sT 88717200SwollmanZone America/Dawson -9:17:40 - LMT 1900 Aug 20 88820094Swollman -9:00 NT_YK Y%sT 1973 Oct 28 0:00 88917200Swollman -8:00 NT_YK P%sT 8902742Swollman 8918029Swollman 8922742Swollman############################################################################### 8932742Swollman 8942742Swollman# Mexico 8952742Swollman 8962742Swollman# From Guy Harris: 8972742Swollman# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 8982742Swollman# Rules prior to 1987 are unknown. 8992742Swollman# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 9002742Swollman# observe DST." This is presumably Baja California Norte, above 28th parallel, 90114343Swollman# as listed there; [there is also] "Baja California Sur and N. Pacific 9022742Swollman# Coast (States of Sinaloa and Sonora)." 9032742Swollman 90419878Swollman# From Bob Devine (1988-01-28): 9052742Swollman# The Federal District (where Mexico City is) has observed [DST] several 9062742Swollman# times but not recently. 9072742Swollman# 9082742Swollman# I don't where to drawn the line in the North Baja area. 28th latitude 9092742Swollman# sounds good -- but it may be higher (how far [d]o radio stations from 9102742Swollman# San Diego affect culture?). 9112742Swollman# 9122742Swollman# The dates of DST probably go back to 1981. The rules are the same as 9132742Swollman# US's. This is going to be a headache for US presidential electi[o]n years! 9142742Swollman 91519878Swollman# From Arthur David Olson (1988-02-13) 9162742Swollman# Since the 1981 starting date is only "probable," we'll keep the 1987 9172742Swollman# starting date below. 9182742Swollman 91919878Swollman# From U. S. Naval Observatory (1989-01-19): 9202742Swollman# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 9212742Swollman# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 9222742Swollman# MEXICO BAJA CAL N OF SINALOA AND SONORA) 92321217Swollman# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 9242742Swollman# MEXICO BAJA CAL N - OCT 29 92521217Swollman# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 9262742Swollman# MEXICO BAJA CAL N - 0CT 29 9272742Swollman# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 9282742Swollman# MEXICO COAHUILA, NUEVO LEON, 9292742Swollman# MEXICO TAMAULIPAS 9302742Swollman# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 9312742Swollman# MEXICO COAHUILA, NUEVO LEON, 9322742Swollman# MEXICO TAMAULIPAS APR 3 - OCT 29 9332742Swollman# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 9342742Swollman# MEXICO CAMPECHE, QUINTANA ROO AND 9352742Swollman# MEXICO YUCATAN 9362742Swollman 93719878Swollman# From Arthur David Olson (1989-01-21): 9382742Swollman# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 9392742Swollman# USNO claims there should be four Mexican zones rather than three: 9402742Swollman# a zone that's GMT-8 with DST; a zone that's always GMT-7; 9412742Swollman# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 9422742Swollman 94317200Swollman# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 9442742Swollman# Shanks also says there are four zones, but disagrees about the fourth. 9452742Swollman# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 9462742Swollman 94717200Swollman# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 94817200Swollman# A guy from our Mexico subsidiary finally found the Presidential Decree 94917200Swollman# outlining the timezone changes in Mexico. 95017200Swollman# 95117200Swollman# ------------- Begin Forwarded Message ------------- 95217200Swollman# 95317200Swollman# I finally got my hands on the Official Presidential Decree that sets up the 95417200Swollman# rules for the DST changes. The rules are: 95517200Swollman# 95617200Swollman# 1. The country is divided in 3 timezones: 95717200Swollman# - Baja California Norte (the Mexico/BajaNorte TZ) 95817200Swollman# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 95917200Swollman# - The rest of the country (the Mexico/General TZ) 96017200Swollman# 96117200Swollman# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 96217200Swollman# at 2:00 AM, the times in each zone are as follows: 96317200Swollman# BajaNorte: GMT+7 96417200Swollman# BajaSur: GMT+6 96517200Swollman# General: GMT+5 96617200Swollman# 96717200Swollman# 3. The rest of the year, the times are as follows: 96817200Swollman# BajaNorte: GMT+8 96917200Swollman# BajaSur: GMT+7 97017200Swollman# General: GMT+6 97117200Swollman# 97217200Swollman# The Decree was published in Mexico's Official Newspaper on January 4th. 97317200Swollman# 97417200Swollman# -------------- End Forwarded Message -------------- 97517200Swollman# From Paul Eggert (1996-06-12): 97617200Swollman# For an English translation of the decree, 97717200Swollman# see ``Diario Oficial: Time Zone Changeover'', 97817200Swollman# <URL:http://mexico-travel.com/extra/timezone_eng.html> (1996-01-04). 97914343Swollman 9802742Swollman# From Shanks (1991): 9812742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 9822742SwollmanRule Mexico 1939 only - Feb 5 0:00 1:00 D 9832742SwollmanRule Mexico 1939 only - Jun 25 0:00 0 S 9842742SwollmanRule Mexico 1940 only - Dec 9 0:00 1:00 D 9852742SwollmanRule Mexico 1941 only - Apr 1 0:00 0 S 9862742SwollmanRule Mexico 1943 only - Dec 16 0:00 1:00 D 9872742SwollmanRule Mexico 1944 only - May 1 0:00 0 S 9882742SwollmanRule Mexico 1950 only - Feb 12 0:00 1:00 D 9892742SwollmanRule Mexico 1950 only - Jul 30 0:00 0 S 99014343SwollmanRule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D 99114343SwollmanRule Mexico 1996 max - Oct lastSun 2:00 0 S 99214343Swollman# 9932742SwollmanRule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 9942742SwollmanRule BajaN 1950 1961 - Sep lastSun 2:00 0 S 9952742SwollmanRule BajaN 1961 1966 - Oct lastSun 2:00 0 S 9962742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 9972742SwollmanZone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 9982742Swollman -7:00 - MST 1927 Jun 10 23:00 9992742Swollman -6:00 - CST 1930 Nov 15 10002742Swollman -7:00 - MST 1931 May 1 23:00 10012742Swollman -6:00 - CST 1931 Oct 10022742Swollman -7:00 - MST 1932 Mar 30 23:00 10032742Swollman -6:00 Mexico C%sT 10042742SwollmanZone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 10052742Swollman -7:00 - MST 1927 Jun 10 23:00 10062742Swollman -6:00 - CST 1930 Nov 15 10072742Swollman -7:00 - MST 1931 May 1 23:00 10082742Swollman -6:00 - CST 1931 Oct 10092742Swollman -7:00 - MST 1932 Mar 30 23:00 10102742Swollman -6:00 - CST 1942 Apr 10112742Swollman -7:00 - MST 1949 Jan 14 10122742Swollman -8:00 - PST 1970 101314343Swollman -7:00 Mexico M%sT 10142742SwollmanZone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 10152742Swollman -8:00 - PST 1927 Jun 10 23:00 10162742Swollman -7:00 - MST 1930 Nov 16 10172742Swollman -8:00 - PST 1942 Apr 10182742Swollman -7:00 - MST 1949 Jan 14 10192742Swollman -8:00 BajaN P%sT 1967 Apr lastSun 2:00 102014343Swollman -8:00 US P%sT 1996 102114343Swollman -8:00 Mexico P%sT 10222742SwollmanZone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 10232742Swollman -8:00 - PST 1927 Jun 10 23:00 10242742Swollman -7:00 - MST 1930 Nov 16 10252742Swollman -8:00 - PST 1942 Apr 10262742Swollman -7:00 - MST 1949 Jan 14 102714343Swollman -8:00 - PST 1996 102814343Swollman -8:00 Mexico P%sT 10292742Swollman# 10302742Swollman# Revillagigedo Is 10312742Swollman# no information 10322742Swollman 10332742Swollman############################################################################### 10342742Swollman 10352742Swollman# Anguilla 10362742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10372742SwollmanZone America/Anguilla -4:12:16 - LMT 1912 Mar 2 10382742Swollman -4:00 - AST 10392742Swollman 10402742Swollman# Antigua and Barbuda 10412742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10422742SwollmanZone America/Antigua -4:07:12 - LMT 1912 Mar 2 10432742Swollman -5:00 - EST 1951 10442742Swollman -4:00 - AST 10452742Swollman 10462742Swollman# Bahamas 10472742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10482742SwollmanRule Bahamas 1964 max - Oct lastSun 2:00 0 S 10492742SwollmanRule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 10502742SwollmanRule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 10512742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10522742SwollmanZone America/Nassau -5:09:24 - LMT 1912 Mar 2 10532742Swollman -5:00 Bahamas E%sT 10542742Swollman 10552742Swollman# Barbados 10562742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10572742SwollmanRule Barb 1977 only - Jun 12 2:00 1:00 D 10582742SwollmanRule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 10592742SwollmanRule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 10602742SwollmanRule Barb 1979 only - Sep 30 2:00 0 S 10612742SwollmanRule Barb 1980 only - Sep 25 2:00 0 S 10622742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10632742SwollmanZone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 10642742Swollman -3:58 - BMT 1932 # Bridgetown Mean Time 10652742Swollman -4:00 Barb A%sT 10662742Swollman 10672742Swollman# Belize 10682742Swollman# Whitman entirely disagrees with Shanks; go with Shanks. 10692742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10702742SwollmanRule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 10712742SwollmanRule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 10722742SwollmanRule Belize 1973 only - Dec 5 0:00 1:00 D 10732742SwollmanRule Belize 1974 only - Feb 9 0:00 0 S 10742742SwollmanRule Belize 1982 only - Dec 18 0:00 1:00 D 10752742SwollmanRule Belize 1983 only - Feb 12 0:00 0 S 10762742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10772742SwollmanZone America/Belize -5:52:48 - LMT 1912 Apr 10782742Swollman -6:00 Belize C%sT 10792742Swollman 10802742Swollman# Bermuda 10812742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10822742SwollmanZone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 10832742Swollman -4:00 - AST 1974 Apr 28 2:00 10842742Swollman -4:00 Bahamas A%sT 10852742Swollman 10862742Swollman# Cayman Is 10872742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 10882742SwollmanZone America/Cayman -5:25:32 - LMT 1890 # Georgetown 10892742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 10902742Swollman -5:00 - EST 10912742Swollman 10922742Swollman# Clipperton 109314343Swollman# uninhabited 10942742Swollman 10952742Swollman# Costa Rica 10962742Swollman# Shanks gives some very odd dates for 1991, and stops there. 10972742Swollman# For now, we won't guess further. 10982742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 10992742SwollmanRule CR 1979 1980 - Feb lastSun 0:00 1:00 D 11002742SwollmanRule CR 1979 1980 - Jun Sun>=1 0:00 0 S 110120094SwollmanRule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 110220094Swollman# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 110320094SwollmanRule CR 1991 only - Jul 1 0:00 0 S 110420094SwollmanRule CR 1992 only - Mar 15 0:00 0 S 11052742Swollman# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 11062742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11072742SwollmanZone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 11082742Swollman -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 11092742Swollman -6:00 CR C%sT 11102742Swollman# Coco 11112742Swollman# no information; probably like America/Costa_Rica 11122742Swollman 11132742Swollman# Cuba 11142742Swollman 111519878Swollman# From Bob Devine (1988-01-28): 11162742Swollman# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 11172742Swollman# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 11182742Swollman# (I think). 11192742Swollman 112019878Swollman# From U. S. Naval Observatory (1989-01-19): 11212742Swollman# CUBA 5 H BEHIND UTC 11222742Swollman# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 11232742Swollman 11242742Swollman# From Shanks (1991): 11252742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11262742SwollmanRule Cuba 1928 only - Jun 10 0:00 1:00 D 11272742SwollmanRule Cuba 1928 only - Oct 10 0:00 0 S 11282742SwollmanRule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 11292742SwollmanRule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 11302742SwollmanRule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 11312742SwollmanRule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 11322742SwollmanRule Cuba 1965 only - Jun 1 0:00 1:00 D 11332742SwollmanRule Cuba 1965 only - Sep 30 0:00 0 S 11342742SwollmanRule Cuba 1966 only - May 29 0:00 1:00 D 11352742SwollmanRule Cuba 1966 only - Oct 2 0:00 0 S 11362742SwollmanRule Cuba 1967 only - Apr 8 0:00 1:00 D 11372742SwollmanRule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 11382742SwollmanRule Cuba 1968 only - Apr 14 0:00 1:00 D 11392742SwollmanRule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 11402742SwollmanRule Cuba 1969 1971 - Oct lastSun 0:00 0 S 11412742SwollmanRule Cuba 1972 1974 - Oct 8 0:00 0 S 11422742SwollmanRule Cuba 1975 1977 - Oct lastSun 0:00 0 S 11432742SwollmanRule Cuba 1978 only - May 7 0:00 1:00 D 114430711SwollmanRule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 11452742SwollmanRule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 11462742SwollmanRule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 11472742SwollmanRule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 114820094SwollmanRule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D 114920094SwollmanRule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 115030711SwollmanRule Cuba 1996 only - Oct Sun>=1 0:00s 0 S 115130711SwollmanRule Cuba 1997 max - Oct Sun>=8 0:00s 0 S 11522742Swollman 11532742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11542742SwollmanZone America/Havana -5:29:28 - LMT 1890 11552742Swollman -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 11562742Swollman -5:00 Cuba C%sT 11572742Swollman 11582742Swollman# Dominica 11592742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11602742SwollmanZone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 11612742Swollman -4:00 - AST 11622742Swollman 11632742Swollman# Dominican Republic 11642742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11652742SwollmanRule DR 1966 only - Oct 30 0:00 1:00 D 11662742SwollmanRule DR 1967 only - Feb 28 0:00 0 S 11672742SwollmanRule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 11682742SwollmanRule DR 1970 only - Feb 21 0:00 0 S 11692742SwollmanRule DR 1971 only - Jan 20 0:00 0 S 11702742SwollmanRule DR 1972 1974 - Jan 21 0:00 0 S 11712742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11722742SwollmanZone America/Santo_Domingo -4:39:36 - LMT 1890 11732742Swollman -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 11742742Swollman -5:00 DR E%sT 1974 Oct 27 11752742Swollman -4:00 - AST 11762742Swollman 11772742Swollman# El Salvador 11782742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11792742SwollmanRule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 11802742SwollmanRule Salv 1987 1988 - Sep lastSun 0:00 0 S 11812742Swollman# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 11822742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11832742SwollmanZone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 11842742Swollman -6:00 Salv C%sT 11852742Swollman 11862742Swollman# Grenada 11872742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 118819878SwollmanZone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 11892742Swollman -4:00 - AST 11902742Swollman 11912742Swollman# Guadeloupe 11922742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11932742SwollmanZone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 11942742Swollman -4:00 - AST 11952742Swollman 11962742Swollman# Guatemala 11972742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 11982742SwollmanRule Guat 1973 only - Nov 25 0:00 1:00 D 11992742SwollmanRule Guat 1974 only - Feb 24 0:00 0 S 12002742SwollmanRule Guat 1983 only - May 21 0:00 1:00 D 12012742SwollmanRule Guat 1983 only - Sep 22 0:00 0 S 120220094SwollmanRule Guat 1991 only - Mar 23 0:00 1:00 D 120320094SwollmanRule Guat 1991 only - Sep 7 0:00 0 S 12042742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12052742SwollmanZone America/Guatemala -6:02:04 - LMT 1918 Oct 5 12062742Swollman -6:00 Guat C%sT 12072742Swollman 12082742Swollman# Haiti 12092742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12102742SwollmanRule Haiti 1983 only - May 8 0:00 1:00 D 12112742SwollmanRule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 12122742SwollmanRule Haiti 1983 1987 - Oct lastSun 0:00 0 S 121320094Swollman# Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA. 121420094SwollmanRule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D 121520094SwollmanRule Haiti 1988 max - Oct lastSun 1:00s 0 S 12162742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12172742SwollmanZone America/Port-au-Prince -4:49:20 - LMT 1890 12182742Swollman -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 12192742Swollman -5:00 Haiti E%sT 12202742Swollman 12212742Swollman# Honduras 12222742Swollman# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 12232742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12242742SwollmanZone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 12252742Swollman -6:00 Salv C%sT 12262742Swollman 12272742Swollman# Jamaica 12282742Swollman 122919878Swollman# From Bob Devine (1988-01-28): 12302742Swollman# Follows US rules. 12312742Swollman 123219878Swollman# From U. S. Naval Observatory (1989-01-19): 12332742Swollman# JAMAICA 5 H BEHIND UTC 12342742Swollman 12352742Swollman# From Shanks (1991): 12362742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12372742SwollmanZone America/Jamaica -5:07:12 - LMT 1890 # Kingston 12382742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 12392742Swollman -5:00 - EST 1974 Jan 6 2:00 124020094Swollman -5:00 US E%sT 1984 124120094Swollman -5:00 - EST 12422742Swollman 12432742Swollman# Martinique 12442742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12452742SwollmanZone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 12462742Swollman -4:04 - FFMT 1911 May # Fort-de-France MT 12472742Swollman -4:00 - AST 1980 Apr 6 12482742Swollman -4:00 1:00 ADT 1980 Sep 28 12492742Swollman -4:00 - AST 12502742Swollman 12512742Swollman# Montserrat 125230711Swollman# From Paul Eggert (1997-08-31): 125330711Swollman# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 125430711Swollman# Luckily, Olveston, the current de facto capital, has the same longitude. 12552742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 125630711SwollmanZone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 12572742Swollman -4:00 - AST 12582742Swollman 12592742Swollman# Nicaragua 12602742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 12612742SwollmanRule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 12622742SwollmanRule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 126320094SwollmanRule Nic 1992 only - Jan 1 4:00 1:00 D 126420094SwollmanRule Nic 1992 only - Sep 24 0:00 0 S 12652742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12662742SwollmanZone America/Managua -5:45:08 - LMT 1890 12672742Swollman -5:45 - MMT 1934 Jun 23 # Managua Mean Time 12682742Swollman -6:00 - CST 1973 May 12692742Swollman -5:00 - EST 1975 Feb 16 127020094Swollman -6:00 Nic C%sT 1993 Jan 1 4:00 127120094Swollman -5:00 - EST 12722742Swollman 12732742Swollman# Panama 12742742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12752742SwollmanZone America/Panama -5:18:08 - LMT 1890 12762742Swollman -5:20 - PMT 1908 Apr 22 # Panama Mean Time 12772742Swollman -5:00 - EST 12782742Swollman 12792742Swollman# Puerto Rico 12802742Swollman# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 12812742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 128214343SwollmanZone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 12832742Swollman -4:00 - AST 1942 May 3 128414343Swollman -4:00 1:00 AWT 1945 Sep 30 2:00 12852742Swollman -4:00 - AST 12862742Swollman 12872742Swollman# St Kitts-Nevis 12882742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12892742SwollmanZone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 12902742Swollman -4:00 - AST 12912742Swollman 12922742Swollman# St Lucia 12932742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 12942742SwollmanZone America/St_Lucia -4:04:00 - LMT 1890 # Castries 12952742Swollman -4:04 - CMT 1912 # Castries Mean Time 12962742Swollman -4:00 - AST 12972742Swollman 12982742Swollman# St Pierre and Miquelon 12992742Swollman# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 13002742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13012742SwollmanZone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 13022742Swollman -4:00 - AST 1980 May 130319878Swollman -3:00 Mont PM%sT # Pierre & Miquelon Time 13042742Swollman 13052742Swollman# St Vincent and the Grenadines 13062742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13072742SwollmanZone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 13082742Swollman -4:05 - KMT 1912 # Kingstown Mean Time 13092742Swollman -4:00 - AST 13102742Swollman 13112742Swollman# Turks and Caicos 131220094Swollman# From Paul Eggert (1996-11-22): 131320094Swollman# Shanks says they use US DST rules, but IATA SSIM (1991/1996) 131420094Swollman# says they switch at midnight. Go with IATA SSIM. 131520094Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 131620094SwollmanRule TC 1979 1986 - Apr lastSun 0:00 1:00 D 131720094SwollmanRule TC 1979 max - Oct lastSun 0:00 0 S 131820094SwollmanRule TC 1987 max - Apr Sun>=1 0:00 1:00 D 13192742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 13202742SwollmanZone America/Grand_Turk -4:44:32 - LMT 1890 13212742Swollman -5:07 - KMT 1912 Feb # Kingston Mean Time 132220094Swollman -5:00 TC E%sT 13238029Swollman 132414343Swollman# British Virgin Is 13252742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 132614343SwollmanZone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 13272742Swollman -4:00 - AST 13288029Swollman 132914343Swollman# Virgin Is 133014343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 133114343SwollmanZone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 133214343Swollman -4:00 - AST 1333