1# @(#)northamerica 7.11
| 1# @(#)northamerica 7.15
|
2# also includes Central America and the Caribbean 3 4# This data is by no means authoritative; if you think you know better, 5# go ahead and edit the file (and please send any changes to 6# tz@elsie.nci.nih.gov for general use in the future). 7 8# From Paul Eggert <eggert@twinsun.com> (August 17, 1994): 9# A reliable and entertaining source about time zones is 10# Derek Howse, Greenwich time and the discovery of the longitude, 11# Oxford University Press (1980). 12 13############################################################################### 14 15# United States 16 17# From Arthur David Olson: 18# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 19# See, for example, the front page of the Saturday, October 26, 1974 20# and Sunday, October 27, 1974 editions of the Washington Post. 21 22# From seismo!munnari!kre: 23# I recall also being told by someone once that Canada didn't have 24# the DST variations in 74/75 that the US did, but I am not nearly 25# sure enough of this to add anything. 26 27# From Arthur David Olson: 28# The above has been confirmed by Bob Devine; we'll go with it here. 29 30# From Arthur David Olson: 31# Before the Uniform Time Act of 1966 took effect in 1967, observance of 32# Daylight Saving Time in the US was by local option, except during wartime. 33 34# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 35Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 36Rule US 1918 1919 - Oct lastSun 2:00 0 S 37Rule US 1942 only - Feb 9 2:00 1:00 W # War 38Rule US 1945 only - Sep 30 2:00 0 S 39Rule US 1967 max - Oct lastSun 2:00 0 S 40Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 41Rule US 1974 only - Jan 6 2:00 1:00 D 42Rule US 1975 only - Feb 23 2:00 1:00 D 43Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 44Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 45 46# From Bob Devine (January 28, 1988): 47# ...Alaska (and Hawaii) had the timezone names changed in 1967. 48# old new 49# Pacific Standard Time(PST) -same- 50# Yukon Standard Time(YST) -same- 51# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 52# Nome Standard Time (NT) Bering Standard Time (BST) 53# 54# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 55# The YST zone now covers nearly all of the state, AHST just part 56# of the Aleutian islands. No DST. 57 58# From U. S. Naval Observatory (January 19, 1989): 59# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 60# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 61# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 62# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 63# USA MOUNTAIN 7 H BEHIND UTC DENVER 64# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 65# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 66# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 67# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 68# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 69# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 70# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 71# USA HAWAII 10 H BEHIND UTC 72# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 73 74# From Arthur David Olson (January 21, 1989): 75# The above dates are for 1988. 76# Note the "AKST" and "AKDT" abbreviations, the claim that there's 77# no DST in Samoa, and the claim that there is DST in Alaska and the 78# Aleutians. 79 80# From Arthur David Olson (February 13, 1988): 81# Legal standard time zone names, from United States Code (1982 Edition and 82# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 83# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 84# took effect), as explained in sections 263 and 261: 85# (none) 86# United States standard eastern time 87# United States standard mountain time 88# United States standard central time 89# United States standard Pacific time 90# (none) 91# United States standard Alaska time 92# (none) 93# Next, names from April 1, 1967 until November 30, 1983 (the date for 94# public law 98-181): 95# Atlantic standard time 96# eastern standard time 97# central standard time 98# mountain standard time 99# Pacific standard time 100# Yukon standard time 101# Alaska-Hawaii standard time 102# Bering standard time 103# And after November 30, 1983: 104# Atlantic standard time 105# eastern standard time 106# central standard time 107# mountain standard time 108# Pacific standard time 109# Alaska standard time 110# Hawaii-Aleutian standard time 111# Samoa standard time 112# The law doesn't give abbreviations. 113 114# From Paul Eggert <eggert@twinsun.com> (August 16, 1994): 115# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 116# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it 117# from Russia. We don't have this data pinned down yet, though. 118 119# Easy stuff first--including Alaska, where we ignore history (since we 120# can't tell if we should give Yukon time or Alaska-Hawaii time for "old" 121# times). 122 123# Zone NAME GMTOFF RULES FORMAT [UNTIL] 124Zone America/New_York -5:00 US E%sT 125Zone America/Chicago -6:00 US C%sT 126Zone America/Denver -7:00 US M%sT 127Zone America/Los_Angeles -8:00 US P%sT 128Zone America/Anchorage -9:00 US AK%sT 129 # AK%sT is the abbreviation per USNO 130 131# ZONE-DESCR America New_York United_States Eastern time (except Indiana and Michigan) 132# ZONE-DESCR America Chicago United_States Central time 133# ZONE-DESCR America Denver United_States Mountain time (except Arizona) 134# ZONE-DESCR America Los_Angeles United_States Pacific time 135# ZONE-DESCR America Anchorage United_States Alaska time 136 137# Mainland US areas that are always Standard as of 1986. 138 139Zone America/Fort_Wayne -5:00 US E%sT 1946 140 -5:00 - EST # Always EST as of 1986 141 142# From Arthur David Olson (October 28, 1991): 143# An article on page A3 of the Sunday, October 27, 1991 Washington Post 144# notes that Starke County switched from Central time to Eastern time as of 145# October 27, 1991. 146Zone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00 147 -5:00 - EST # Always EST as of 1991 148Zone America/Phoenix -7:00 US M%sT 1946 149 -7:00 - MST # Always MST as of 1986 150 151# ZONE-DESCR America Fort_Wayne United_States Indiana (except Starke County) 152# ZONE-DESCR America Knox_IN United_States Indiana (Starke County) 153# ZONE-DESCR America Phoenix United_States Arizona (except Navajo Nation)
| 2# also includes Central America and the Caribbean 3 4# This data is by no means authoritative; if you think you know better, 5# go ahead and edit the file (and please send any changes to 6# tz@elsie.nci.nih.gov for general use in the future). 7 8# From Paul Eggert <eggert@twinsun.com> (August 17, 1994): 9# A reliable and entertaining source about time zones is 10# Derek Howse, Greenwich time and the discovery of the longitude, 11# Oxford University Press (1980). 12 13############################################################################### 14 15# United States 16 17# From Arthur David Olson: 18# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 19# See, for example, the front page of the Saturday, October 26, 1974 20# and Sunday, October 27, 1974 editions of the Washington Post. 21 22# From seismo!munnari!kre: 23# I recall also being told by someone once that Canada didn't have 24# the DST variations in 74/75 that the US did, but I am not nearly 25# sure enough of this to add anything. 26 27# From Arthur David Olson: 28# The above has been confirmed by Bob Devine; we'll go with it here. 29 30# From Arthur David Olson: 31# Before the Uniform Time Act of 1966 took effect in 1967, observance of 32# Daylight Saving Time in the US was by local option, except during wartime. 33 34# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 35Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 36Rule US 1918 1919 - Oct lastSun 2:00 0 S 37Rule US 1942 only - Feb 9 2:00 1:00 W # War 38Rule US 1945 only - Sep 30 2:00 0 S 39Rule US 1967 max - Oct lastSun 2:00 0 S 40Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 41Rule US 1974 only - Jan 6 2:00 1:00 D 42Rule US 1975 only - Feb 23 2:00 1:00 D 43Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 44Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 45 46# From Bob Devine (January 28, 1988): 47# ...Alaska (and Hawaii) had the timezone names changed in 1967. 48# old new 49# Pacific Standard Time(PST) -same- 50# Yukon Standard Time(YST) -same- 51# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 52# Nome Standard Time (NT) Bering Standard Time (BST) 53# 54# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 55# The YST zone now covers nearly all of the state, AHST just part 56# of the Aleutian islands. No DST. 57 58# From U. S. Naval Observatory (January 19, 1989): 59# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 60# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 61# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 62# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 63# USA MOUNTAIN 7 H BEHIND UTC DENVER 64# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 65# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 66# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 67# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 68# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 69# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 70# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 71# USA HAWAII 10 H BEHIND UTC 72# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 73 74# From Arthur David Olson (January 21, 1989): 75# The above dates are for 1988. 76# Note the "AKST" and "AKDT" abbreviations, the claim that there's 77# no DST in Samoa, and the claim that there is DST in Alaska and the 78# Aleutians. 79 80# From Arthur David Olson (February 13, 1988): 81# Legal standard time zone names, from United States Code (1982 Edition and 82# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 83# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 84# took effect), as explained in sections 263 and 261: 85# (none) 86# United States standard eastern time 87# United States standard mountain time 88# United States standard central time 89# United States standard Pacific time 90# (none) 91# United States standard Alaska time 92# (none) 93# Next, names from April 1, 1967 until November 30, 1983 (the date for 94# public law 98-181): 95# Atlantic standard time 96# eastern standard time 97# central standard time 98# mountain standard time 99# Pacific standard time 100# Yukon standard time 101# Alaska-Hawaii standard time 102# Bering standard time 103# And after November 30, 1983: 104# Atlantic standard time 105# eastern standard time 106# central standard time 107# mountain standard time 108# Pacific standard time 109# Alaska standard time 110# Hawaii-Aleutian standard time 111# Samoa standard time 112# The law doesn't give abbreviations. 113 114# From Paul Eggert <eggert@twinsun.com> (August 16, 1994): 115# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 116# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it 117# from Russia. We don't have this data pinned down yet, though. 118 119# Easy stuff first--including Alaska, where we ignore history (since we 120# can't tell if we should give Yukon time or Alaska-Hawaii time for "old" 121# times). 122 123# Zone NAME GMTOFF RULES FORMAT [UNTIL] 124Zone America/New_York -5:00 US E%sT 125Zone America/Chicago -6:00 US C%sT 126Zone America/Denver -7:00 US M%sT 127Zone America/Los_Angeles -8:00 US P%sT 128Zone America/Anchorage -9:00 US AK%sT 129 # AK%sT is the abbreviation per USNO 130 131# ZONE-DESCR America New_York United_States Eastern time (except Indiana and Michigan) 132# ZONE-DESCR America Chicago United_States Central time 133# ZONE-DESCR America Denver United_States Mountain time (except Arizona) 134# ZONE-DESCR America Los_Angeles United_States Pacific time 135# ZONE-DESCR America Anchorage United_States Alaska time 136 137# Mainland US areas that are always Standard as of 1986. 138 139Zone America/Fort_Wayne -5:00 US E%sT 1946 140 -5:00 - EST # Always EST as of 1986 141 142# From Arthur David Olson (October 28, 1991): 143# An article on page A3 of the Sunday, October 27, 1991 Washington Post 144# notes that Starke County switched from Central time to Eastern time as of 145# October 27, 1991. 146Zone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00 147 -5:00 - EST # Always EST as of 1991 148Zone America/Phoenix -7:00 US M%sT 1946 149 -7:00 - MST # Always MST as of 1986 150 151# ZONE-DESCR America Fort_Wayne United_States Indiana (except Starke County) 152# ZONE-DESCR America Knox_IN United_States Indiana (Starke County) 153# ZONE-DESCR America Phoenix United_States Arizona (except Navajo Nation)
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154# ZONE-DESCR America Navajo United_States Arizona (Navajo Nation)
| 154# ZONE-DESCR America Shiprock United_States Arizona (Navajo Nation)
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155 156# From Arthur David Olson (February 13, 1988): 157# However. . .a writer from the Inter Tribal Council of Arizona, Inc., 158# notes in private correspondence dated 12/28/87 that "Presently, only the 159# Navajo Nation participates in the Daylight Saving Time policy, due to its 160# large size and location in three states." (The "only" means that other 161# tribal nations don't use DST.) 162
| 155 156# From Arthur David Olson (February 13, 1988): 157# However. . .a writer from the Inter Tribal Council of Arizona, Inc., 158# notes in private correspondence dated 12/28/87 that "Presently, only the 159# Navajo Nation participates in the Daylight Saving Time policy, due to its 160# large size and location in three states." (The "only" means that other 161# tribal nations don't use DST.) 162
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163Link America/Denver America/Navajo
| 163Link America/Denver America/Shiprock
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164 165# From Bob Devine (January 28, 1988): 166# Michigan didn't observe DST from 1968 to 1973. 167 168Zone America/Detroit -5:00 US E%sT 1968 169 -5:00 - EST 1973 170 -5:00 US E%sT 171 172# ZONE-DESCR America Detroit United_States Michigan 173 174# Samoa just changes names. No DST, per Naval Observatory. 175# 176# Howse writes that in 1879 the King of Samoa decided to change 177# ``the date in his kingdom from the Antipodean to the American system, 178# ordaining -- by a masterpiece of diplomatic flattery -- that 179# the Fourth of July should be celebrated twice in that year.'' 180 181Zone Pacific/Pago_Pago 12:37:12 - LMT 1879 Jul 5 182 -11:22:48 - LMT 1911 183 -11:30 - SST 1950 184 -11:00 - NST 1967 Apr # N=Nome 185 -11:00 - BST 1983 Nov 30 # B=Bering 186 -11:00 - SST # S=Samoa 187 188Zone Pacific/Midway -11:49:28 - LMT 1901 189 -11:00 - NST 1967 Apr # N=Nome 190 -11:00 - BST 1983 Nov 30 # B=Bering 191 -11:00 - SST # S=Samoa 192 193# Aleutian has a name change. DST, per Naval Observatory. 194 195Zone America/Atka -10:00 US AH%sT 1983 Nov 30 196 -10:00 US HA%sT 197 198# From Arthur David Olson: 199# And then there's Hawaii. 200# DST was observed for one day in 1933; 201# Standard time was change by half an hour in 1947; 202# it's always standard as of 1986. 203 204Zone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00 205 -10:30 1:00 HDT 1933 May 1 2:00 206 -10:30 US H%sT 1947 Jun 8 2:00 207 -10:00 - HST 208 209# Same time in American and Western Samoa 210Link Pacific/Pago_Pago Pacific/Apia 211 212# ZONE-DESCR Pacific Pago_Pago United_States American Samoa 213# ZONE-DESCR Pacific Apia Western_Samoa All points 214# ZONE-DESCR Pacific Midway United_States Midway Island 215# ZONE-DESCR America Atka United_States Aleutian Islands 216# ZONE-DESCR Pacific Honolulu United_States Hawaii 217 218# Navassa 219# no information; probably like US/Eastern 220 221
| 164 165# From Bob Devine (January 28, 1988): 166# Michigan didn't observe DST from 1968 to 1973. 167 168Zone America/Detroit -5:00 US E%sT 1968 169 -5:00 - EST 1973 170 -5:00 US E%sT 171 172# ZONE-DESCR America Detroit United_States Michigan 173 174# Samoa just changes names. No DST, per Naval Observatory. 175# 176# Howse writes that in 1879 the King of Samoa decided to change 177# ``the date in his kingdom from the Antipodean to the American system, 178# ordaining -- by a masterpiece of diplomatic flattery -- that 179# the Fourth of July should be celebrated twice in that year.'' 180 181Zone Pacific/Pago_Pago 12:37:12 - LMT 1879 Jul 5 182 -11:22:48 - LMT 1911 183 -11:30 - SST 1950 184 -11:00 - NST 1967 Apr # N=Nome 185 -11:00 - BST 1983 Nov 30 # B=Bering 186 -11:00 - SST # S=Samoa 187 188Zone Pacific/Midway -11:49:28 - LMT 1901 189 -11:00 - NST 1967 Apr # N=Nome 190 -11:00 - BST 1983 Nov 30 # B=Bering 191 -11:00 - SST # S=Samoa 192 193# Aleutian has a name change. DST, per Naval Observatory. 194 195Zone America/Atka -10:00 US AH%sT 1983 Nov 30 196 -10:00 US HA%sT 197 198# From Arthur David Olson: 199# And then there's Hawaii. 200# DST was observed for one day in 1933; 201# Standard time was change by half an hour in 1947; 202# it's always standard as of 1986. 203 204Zone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00 205 -10:30 1:00 HDT 1933 May 1 2:00 206 -10:30 US H%sT 1947 Jun 8 2:00 207 -10:00 - HST 208 209# Same time in American and Western Samoa 210Link Pacific/Pago_Pago Pacific/Apia 211 212# ZONE-DESCR Pacific Pago_Pago United_States American Samoa 213# ZONE-DESCR Pacific Apia Western_Samoa All points 214# ZONE-DESCR Pacific Midway United_States Midway Island 215# ZONE-DESCR America Atka United_States Aleutian Islands 216# ZONE-DESCR Pacific Honolulu United_States Hawaii 217 218# Navassa 219# no information; probably like US/Eastern 220 221
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222# Old names, for S5 users 223 224# Link LINK-FROM LINK-TO 225Link America/New_York EST5EDT 226Link America/Chicago CST6CDT 227Link America/Denver MST7MDT 228Link America/Los_Angeles PST8PDT 229Link America/Fort_Wayne EST 230Link America/Phoenix MST 231Link Pacific/Honolulu HST 232
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233################################################################################ 234 235 236# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 237# A good source for time zone historical data outside the U.S. is 238# Thomas G. Shanks, The International Atlas (3rd edition), 239# San Diego: ACS Publications, Inc. (1991). 240# Except where otherwise noted, it is the source for the data below. 241# 242# Another source occasionally used is Edward W. Whitman, World Time Differences, 243# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 244# I found in the UCLA library. 245# 246# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise. 247# Corrections are welcome! 248#
| 222################################################################################ 223 224 225# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 226# A good source for time zone historical data outside the U.S. is 227# Thomas G. Shanks, The International Atlas (3rd edition), 228# San Diego: ACS Publications, Inc. (1991). 229# Except where otherwise noted, it is the source for the data below. 230# 231# Another source occasionally used is Edward W. Whitman, World Time Differences, 232# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 233# I found in the UCLA library. 234# 235# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise. 236# Corrections are welcome! 237#
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| 238# See the `europe' file for Greenland. 239#
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249# See the `africa' file for Zone naming conventions. 250 251 252 253# Canada 254 255# Canada is reportedly lots easier than the US--leastways since 1951. 256# I don't know what they did before then. 257# 4.3BSD claims that it's perfectly regular. 258# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc. 259# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada, 260# "...Canada (well, Ontario and at least some of the other provinces) are 261# adopting the new daylight savings time rules...". We assume all of 262# Canada is doing so. 263 264# From Bob Devine (January 28, 1988): 265# All of Canada did have DST from your first rule except Saskatchewan. 266# Which parts did not observe DST is hard to pinpoint but most of the 267# province follows the rules. 268# NOTE: those that didn't have DST for that rule, also 269# probably did not have it for several years previous. 270 271# From U. S. Naval Observatory (January 19, 1989): 272# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S 273# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29 274# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX 275# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29 276# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA 277# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29 278# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG 279# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29 280# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON 281# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29 282# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER 283# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29 284# CANADA YUKON SAME AS PACIFIC DAWSON 285 286# From Arthur David Olson (January 21, 1989): 287# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 288# Note claim that there's double DST in Newfoundland and that Yukon should 289# be same as Pacific. 290 291# From W. Jones (jones@skdad.usask.ca) (November 6, 1992): 292# The. . .below is based on information I got from our law library, the 293# provincial archives, and the provincial Community Services department. 294# A precise history would require digging through newspaper archives, and 295# since you didn't say what you wanted, I didn't bother. 296# 297# Saskatchewan is split by a time zone meridian (105W) and over the years 298# the boundary became pretty ragged as communities near it reevaluated 299# their affiliations in one direction or the other. In 1965 a provincial 300# referendum favoured legislating common time practices. 301# 302# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 303# Saskatchewan 1978) was proclaimed, and established that the eastern 304# part of Saskatchewan would use CST year round, that districts in 305# northwest Saskatchewan would by default follow CST but could opt to 306# follow Mountain Time rules (thus 1 hour difference in the winter and 307# zero in the summer), and that districts in southwest Saskatchewan would 308# by default follow MT but could opt to follow CST. 309# 310# It took a few years for the dust to settle (I know one story of a town 311# on one time zone having its school in another, such that a mom had to 312# serve her family lunch in two shifts), but presently it seems that only 313# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 314# rules any more; all other districts appear to have used CST year round 315# since sometime in the 1960s. 316# 317# Here's how I would summarize things. Establish a "Saskatchewan" CST 318# time zone, and note that it officially exists as of 15 April 1966. Any 319# current exceptions can put themselves in the "Mountain" zone, since 320# those are the rules they follow. Any past exceptions can be forgotten, 321# since that's what those who live here have done. 322 323# From Arthur David Olson (November 21, 1992): 324# East-Saskatchewan kept to avoid problems for folks using that zone by name; 325# plain Saskatchewan added. 326
| 240# See the `africa' file for Zone naming conventions. 241 242 243 244# Canada 245 246# Canada is reportedly lots easier than the US--leastways since 1951. 247# I don't know what they did before then. 248# 4.3BSD claims that it's perfectly regular. 249# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc. 250# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada, 251# "...Canada (well, Ontario and at least some of the other provinces) are 252# adopting the new daylight savings time rules...". We assume all of 253# Canada is doing so. 254 255# From Bob Devine (January 28, 1988): 256# All of Canada did have DST from your first rule except Saskatchewan. 257# Which parts did not observe DST is hard to pinpoint but most of the 258# province follows the rules. 259# NOTE: those that didn't have DST for that rule, also 260# probably did not have it for several years previous. 261 262# From U. S. Naval Observatory (January 19, 1989): 263# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S 264# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29 265# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX 266# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29 267# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA 268# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29 269# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG 270# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29 271# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON 272# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29 273# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER 274# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29 275# CANADA YUKON SAME AS PACIFIC DAWSON 276 277# From Arthur David Olson (January 21, 1989): 278# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 279# Note claim that there's double DST in Newfoundland and that Yukon should 280# be same as Pacific. 281 282# From W. Jones (jones@skdad.usask.ca) (November 6, 1992): 283# The. . .below is based on information I got from our law library, the 284# provincial archives, and the provincial Community Services department. 285# A precise history would require digging through newspaper archives, and 286# since you didn't say what you wanted, I didn't bother. 287# 288# Saskatchewan is split by a time zone meridian (105W) and over the years 289# the boundary became pretty ragged as communities near it reevaluated 290# their affiliations in one direction or the other. In 1965 a provincial 291# referendum favoured legislating common time practices. 292# 293# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 294# Saskatchewan 1978) was proclaimed, and established that the eastern 295# part of Saskatchewan would use CST year round, that districts in 296# northwest Saskatchewan would by default follow CST but could opt to 297# follow Mountain Time rules (thus 1 hour difference in the winter and 298# zero in the summer), and that districts in southwest Saskatchewan would 299# by default follow MT but could opt to follow CST. 300# 301# It took a few years for the dust to settle (I know one story of a town 302# on one time zone having its school in another, such that a mom had to 303# serve her family lunch in two shifts), but presently it seems that only 304# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 305# rules any more; all other districts appear to have used CST year round 306# since sometime in the 1960s. 307# 308# Here's how I would summarize things. Establish a "Saskatchewan" CST 309# time zone, and note that it officially exists as of 15 April 1966. Any 310# current exceptions can put themselves in the "Mountain" zone, since 311# those are the rules they follow. Any past exceptions can be forgotten, 312# since that's what those who live here have done. 313 314# From Arthur David Olson (November 21, 1992): 315# East-Saskatchewan kept to avoid problems for folks using that zone by name; 316# plain Saskatchewan added. 317
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| 318# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 319# I post here the time zone abbreviations standardized in Canada 320# for both English and French in the CAN/CSA-Z234.4-89 standard.... 321# 322# UTC Standard time Daylight savings time 323# offset French English French English 324# -2:30 - - HAT NDT 325# -3 - - HAA ADT 326# -3:30 HNT NST - - 327# -4 HNA AST HAE EDT 328# -5 HNE EST HAC CDT 329# -6 HNC CST HAR MDT 330# -7 HNR MST HAP PDT 331# -8 HNP PST HAY YDT 332# -9 HNY YST - - 333# 334# HN: Heure Normale ST: Standard Time 335# HA: Heure Avanc<e'>e DT: Daylight saving Time 336# 337# A: de l'Atlantique Atlantic 338# C: du Centre Central 339# E: de l'Est Eastern 340# M: Mountain 341# N: Newfoundland 342# P: du Pacifique Pacific 343# R: des Rocheuses 344# T: de Terre-Neuve 345# Y: du Yukon Yukon 346# 347# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 348# Alas, this sort of thing must be handled by localization software.
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327
| 349
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| 350 351
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328# From Shanks (1991): 329# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 330Rule StJohns 1884 only - Jan 1 0:00 0 S 331Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 332Rule StJohns 1917 only - Sep 17 2:00 0 S 333Rule StJohns 1918 only - Oct 31 2:00 0 S 334# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 335Rule StJohns 1919 only - May 5 23:00 1:00 D 336Rule StJohns 1919 only - Aug 12 23:00 0 S 337# For 1931-1935 Whitman gives Apr same date; go with Shanks. 338Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 339Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 340# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 341Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 342Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 343# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 344Rule StJohns 1942 only - Mar 1 0:00 1:00 D 345Rule StJohns 1942 only - Dec 31 0:00 0 S 346Rule StJohns 1943 only - May 30 0:00 1:00 D 347Rule StJohns 1943 only - Sep 5 0:00 0 S 348Rule StJohns 1944 only - Jul 10 0:00 1:00 D 349Rule StJohns 1944 only - Sep 2 0:00 0 S 350Rule StJohns 1945 only - Jan 1 0:00 1:00 D 351Rule StJohns 1945 only - Oct 7 2:00 0 S 352# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 353# Apr 30 - Sep 24; go with Shanks. 354Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 355Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 356Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 357Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 358Rule StJohns 1960 max - Oct lastSun 2:00 0 S 359Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 360Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D 361Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 362# St John's has an apostrophe, but Posix file names can't have apostrophes. 363# Zone NAME GMTOFF RULES FORMAT [UNTIL] 364Zone America/St_Johns -3:30:52 - LMT 1884 365 -3:31 StJohns N%sT 1935 Mar 30 366 -3:30 StJohns N%sT 367 368# ZONE-DESCR America St_Johns Canada Newfoundland 369 370# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 371Rule Halifax 1902 only - Jun 15 0:00 0 S 372Rule Halifax 1916 only - Apr 1 0:00 1:00 D 373Rule Halifax 1916 only - Oct 1 0:00 0 S 374Rule Halifax 1918 only - Apr 14 2:00 1:00 D 375Rule Halifax 1918 only - Oct 31 2:00 0 S 376Rule Halifax 1920 only - May 9 0:00 1:00 D 377Rule Halifax 1920 only - Aug 29 0:00 0 S 378Rule Halifax 1921 only - May 6 0:00 1:00 D 379Rule Halifax 1921 1922 - Sep 5 0:00 0 S 380Rule Halifax 1922 only - Apr 30 0:00 1:00 D 381Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 382Rule Halifax 1923 only - Sep 4 0:00 0 S 383Rule Halifax 1924 only - Sep 15 0:00 0 S 384Rule Halifax 1925 only - Sep 28 0:00 0 S 385Rule Halifax 1926 only - May 16 0:00 1:00 D 386Rule Halifax 1926 only - Sep 13 0:00 0 S 387Rule Halifax 1927 only - May 1 0:00 1:00 D 388Rule Halifax 1927 only - Sep 26 0:00 0 S 389Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 390Rule Halifax 1928 only - Sep 9 0:00 0 S 391Rule Halifax 1929 only - Sep 3 0:00 0 S 392Rule Halifax 1930 only - Sep 15 0:00 0 S 393Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 394Rule Halifax 1933 only - Apr 30 0:00 1:00 D 395Rule Halifax 1933 only - Oct 2 0:00 0 S 396Rule Halifax 1934 only - May 20 0:00 1:00 D 397Rule Halifax 1934 only - Sep 16 0:00 0 S 398Rule Halifax 1935 only - Jun 2 0:00 1:00 D 399Rule Halifax 1935 only - Sep 30 0:00 0 S 400Rule Halifax 1936 only - Jun 1 0:00 1:00 D 401Rule Halifax 1936 only - Sep 14 0:00 0 S 402Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 403Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 404Rule Halifax 1939 only - May 28 0:00 1:00 D 405Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 406Rule Halifax 1942 only - Feb 9 2:00 1:00 D 407Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S 408Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 409Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 410Rule Halifax 1962 max - Oct lastSun 2:00 0 S 411Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 412# Zone NAME GMTOFF RULES FORMAT [UNTIL] 413Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 414 -4:00 Halifax A%sT 415 416# ZONE-DESCR America Halifax Canada Atlantic time 417 418# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 419Rule Mont 1884 only - Jan 1 0:00 0 S 420Rule Mont 1917 only - Mar 25 2:00 1:00 D 421Rule Mont 1917 only - Apr 24 0:00 0 S 422Rule Mont 1918 only - Apr 14 2:00 1:00 D 423Rule Mont 1918 only - Oct 31 2:00 0 S 424Rule Mont 1919 only - Mar 31 2:30 1:00 D 425Rule Mont 1919 only - Oct 25 2:30 0 S 426Rule Mont 1920 only - May 2 2:30 1:00 D 427Rule Mont 1920 only - Oct 3 2:30 0 S 428Rule Mont 1921 only - May 1 2:00 1:00 D 429Rule Mont 1921 only - Oct 2 2:30 0 S 430Rule Mont 1922 only - Apr 30 2:00 1:00 D 431Rule Mont 1922 only - Oct 1 2:30 0 S 432Rule Mont 1924 only - May 17 2:00 1:00 D 433Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 434Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 435Rule Mont 1927 only - May 1 0:00 1:00 D 436Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 437Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 438Rule Mont 1932 only - May 1 0:00 1:00 D 439Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 440Rule Mont 1933 only - Oct 1 0:00 0 S 441Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 442Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 443Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 444Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 445Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 446Rule Mont 1957 max - Oct lastSun 2:00 0 S 447Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 448# Zone NAME GMTOFF RULES FORMAT [UNTIL] 449Zone America/Montreal -4:54:16 - LMT 1884 450 -5:00 Mont E%sT 451 452# ZONE-DESCR America Montreal Canada Eastern time 453 454# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 455Rule Winn 1887 only - Jul 16 0:00 0 S 456Rule Winn 1916 only - Apr 23 0:00 1:00 D 457Rule Winn 1916 only - Sep 17 0:00 0 S 458Rule Winn 1918 only - Apr 14 2:00 1:00 D 459Rule Winn 1918 only - Oct 31 2:00 0 S 460Rule Winn 1937 only - May 16 2:00 1:00 D 461Rule Winn 1937 only - Sep 23 2:00 0 S 462Rule Winn 1942 only - Feb 9 2:00 1:00 D 463Rule Winn 1945 only - Sep lastSun 2:00 0 S 464Rule Winn 1946 only - May 12 2:00 1:00 D 465Rule Winn 1946 only - Oct 13 2:00 0 S 466Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 467Rule Winn 1947 1958 - Sep lastSun 2:00 0 S 468Rule Winn 1948 only - May 1 2:00 1:00 D 469Rule Winn 1948 1960 - Apr lastSun 2:00 1:00 D 470Rule Winn 1959 only - Oct lastSun 2:00 0 S 471Rule Winn 1960 only - Sep lastSun 2:00 0 S 472Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 473Rule Winn 1963 only - Sep lastSun 2:00 0 S 474Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 475Rule Winn 1966 max - Sep lastSun 2:00 0 S 476Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 477# Zone NAME GMTOFF RULES FORMAT [UNTIL] 478Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 479 -6:00 Winn C%sT 480 481# ZONE-DESCR America Winnipeg Canada Manitoba 482 483# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 484Rule Regina 1905 only - Sep 1 0:00 0 S 485Rule Regina 1918 only - Apr 14 2:00 1:00 D 486Rule Regina 1918 only - Oct 31 2:00 0 S 487Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 488Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 489Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 490Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 491Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 492Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 493Rule Regina 1942 only - Feb 9 2:00 1:00 D 494Rule Regina 1945 only - Sep lastSun 2:00 0 S 495Rule Regina 1946 only - Apr 14 2:00 1:00 D 496Rule Regina 1946 only - Oct 13 2:00 0 S 497Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D 498Rule Regina 1947 1959 - Sep lastSun 2:00 0 S 499# Zone NAME GMTOFF RULES FORMAT [UNTIL] 500Zone America/Regina -6:58:36 - LMT 1905 Sep 501 -7:00 Regina M%sT 1966 Apr 15 502 -6:00 - CST 503 504# ZONE-DESCR America Regina Canada Saskatchewan 505 506# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 507Rule Edm 1906 only - Sep 1 0:00 0 S 508Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 509Rule Edm 1918 only - Oct 31 2:00 0 S 510Rule Edm 1919 only - May 27 2:00 0 S 511Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 512Rule Edm 1920 only - Oct lastSun 2:00 0 S 513Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 514Rule Edm 1942 only - Feb 9 2:00 1:00 D 515Rule Edm 1945 only - Sep lastSun 2:00 0 S 516Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 517Rule Edm 1947 only - Sep lastSun 2:00 0 S 518Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 519Rule Edm 1967 only - Oct lastSun 2:00 0 S 520Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 521Rule Edm 1969 only - Oct lastSun 2:00 0 S 522Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 523Rule Edm 1972 max - Oct lastSun 2:00 0 S 524Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 525# Zone NAME GMTOFF RULES FORMAT [UNTIL] 526Zone America/Edmonton -7:33:52 - LMT 1906 Sep 527 -7:00 Edm M%sT 528 529# ZONE-DESCR America Edmonton Canada Alberta 530 531# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 532Rule Vanc 1884 only - Jan 1 0:00 0 S 533Rule Vanc 1918 only - Apr 14 2:00 1:00 D 534Rule Vanc 1918 only - Oct 31 2:00 0 S 535Rule Vanc 1942 only - Feb 9 2:00 1:00 D 536Rule Vanc 1945 only - Sep 30 2:00 0 S 537Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 538Rule Vanc 1946 only - Oct 13 2:00 0 S 539Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 540Rule Vanc 1962 max - Oct lastSun 2:00 0 S 541Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 542# Zone NAME GMTOFF RULES FORMAT [UNTIL] 543Zone America/Vancouver -8:12:28 - LMT 1884 544 -8:00 Vanc P%sT 545 546# ZONE-DESCR America Vancouver Canada British Columbia 547 548# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 549Rule Yukon 1900 only - Jan 1 0:00 0 S 550Rule Yukon 1918 only - Apr 14 2:00 1:00 D 551Rule Yukon 1918 only - Oct 27 2:00 0 S 552Rule Yukon 1919 only - May 25 2:00 1:00 D 553Rule Yukon 1919 only - Nov 1 0:00 0 S 554Rule Yukon 1942 only - Feb 9 2:00 1:00 D 555Rule Yukon 1965 only - Apr 25 0:00 1:00 D 556Rule Yukon 1965 only - Oct 31 2:00 0 S 557Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D 558Rule Yukon 1980 max - Oct lastSun 2:00 0 S 559Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D 560# Zone NAME GMTOFF RULES FORMAT [UNTIL] 561Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 562 -9:00 Yukon Y%sT 1966 Jul 563 -8:00 Yukon P%sT 564# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28. 565 566# ZONE-DESCR America Whitehorse Canada Yukon Territory 567 568############################################################################### 569 570# Mexico 571 572# From Guy Harris: 573# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 574# Rules prior to 1987 are unknown. 575# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 576# observe DST." This is presumably Baja California Norte, above 28th parallel, 577# as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific 578# Coast (States of Sinaloa and Sonora)." 579 580# From Bob Devine (January 28, 1988): 581# The Federal District (where Mexico City is) has observed [DST] several 582# times but not recently. 583# 584# I don't where to drawn the line in the North Baja area. 28th latitude 585# sounds good -- but it may be higher (how far [d]o radio stations from 586# San Diego affect culture?). 587# 588# The dates of DST probably go back to 1981. The rules are the same as 589# US's. This is going to be a headache for US presidential electi[o]n years! 590 591# From Arthur David Olson (February 13, 1988) 592# Since the 1981 starting date is only "probable," we'll keep the 1987 593# starting date below. 594 595# From U. S. Naval Observatory (January 19, 1989): 596# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 597# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 598# MEXICO BAJA CAL N OF SINALOA AND SONORA) 599# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 600# MEXICO BAJA CAL N - OCT 29 601# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 602# MEXICO BAJA CAL N - 0CT 29 603# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 604# MEXICO COAHUILA, NUEVO LEON, 605# MEXICO TAMAULIPAS 606# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 607# MEXICO COAHUILA, NUEVO LEON, 608# MEXICO TAMAULIPAS APR 3 - OCT 29 609# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 610# MEXICO CAMPECHE, QUINTANA ROO AND 611# MEXICO YUCATAN 612 613# From Arthur David Olson (January 21, 1989): 614# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 615# USNO claims there should be four Mexican zones rather than three: 616# a zone that's GMT-8 with DST; a zone that's always GMT-7; 617# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 618 619# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 620# Shanks also says there are four zones, but disagrees about the fourth. 621# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 622 623# From Shanks (1991): 624# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 625Rule Mexico 1922 only - Jan 1 0:00 0 S 626Rule Mexico 1939 only - Feb 5 0:00 1:00 D 627Rule Mexico 1939 only - Jun 25 0:00 0 S 628Rule Mexico 1940 only - Dec 9 0:00 1:00 D 629Rule Mexico 1941 only - Apr 1 0:00 0 S 630Rule Mexico 1943 only - Dec 16 0:00 1:00 D 631Rule Mexico 1944 only - May 1 0:00 0 S 632Rule Mexico 1950 only - Feb 12 0:00 1:00 D 633Rule Mexico 1950 only - Jul 30 0:00 0 S 634Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 635Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S 636Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S 637# Zone NAME GMTOFF RULES FORMAT [UNTIL] 638Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 639 -7:00 - MST 1927 Jun 10 23:00 640 -6:00 - CST 1930 Nov 15 641 -7:00 - MST 1931 May 1 23:00 642 -6:00 - CST 1931 Oct 643 -7:00 - MST 1932 Mar 30 23:00 644 -6:00 Mexico C%sT 645# ZONE-DESCR America Mexico_City Mexico Mexico City 646Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 647 -7:00 - MST 1927 Jun 10 23:00 648 -6:00 - CST 1930 Nov 15 649 -7:00 - MST 1931 May 1 23:00 650 -6:00 - CST 1931 Oct 651 -7:00 - MST 1932 Mar 30 23:00 652 -6:00 - CST 1942 Apr 653 -7:00 - MST 1949 Jan 14 654 -8:00 - PST 1970 655 -7:00 - MST 656# ZONE-DESCR America Mazatlan Mexico Mazatlan 657Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 658 -8:00 - PST 1927 Jun 10 23:00 659 -7:00 - MST 1930 Nov 16 660 -8:00 - PST 1942 Apr 661 -7:00 - MST 1949 Jan 14 662 -8:00 BajaN P%sT 1967 Apr lastSun 2:00 663 -8:00 US P%sT 664# ZONE-DESCR America Tijuana Mexico Baja California Norte 665Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 666 -8:00 - PST 1927 Jun 10 23:00 667 -7:00 - MST 1930 Nov 16 668 -8:00 - PST 1942 Apr 669 -7:00 - MST 1949 Jan 14 670 -8:00 - PST 671# ZONE-DESCR America Ensenada Mexico Ensenada 672 673# 674# Revillagigedo Is 675# no information 676 677############################################################################### 678 679# Anguilla 680# Zone NAME GMTOFF RULES FORMAT [UNTIL] 681Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 682 -4:00 - AST 683 684# ZONE-DESCR America Anguilla Anguilla All points 685 686# Antigua and Barbuda 687# Zone NAME GMTOFF RULES FORMAT [UNTIL] 688Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 689 -5:00 - EST 1951 690 -4:00 - AST 691 692# ZONE-DESCR America Antigua Antigua All points 693 694# Bahamas 695# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 696Rule Bahamas 1912 only - Mar 2 0:00 0 S 697Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 698Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 699Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 700# Zone NAME GMTOFF RULES FORMAT [UNTIL] 701Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 702 -5:00 Bahamas E%sT 703 704# ZONE-DESCR America Nassau Bahamas All points 705 706# Barbados 707# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 708Rule Barb 1932 only - Jan 1 0:00 0 S 709Rule Barb 1977 only - Jun 12 2:00 1:00 D 710Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 711Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 712Rule Barb 1979 only - Sep 30 2:00 0 S 713Rule Barb 1980 only - Sep 25 2:00 0 S 714# Zone NAME GMTOFF RULES FORMAT [UNTIL] 715Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 716 -3:58 - BMT 1932 # Bridgetown Mean Time 717 -4:00 Barb A%sT 718 719# ZONE-DESCR America Barbados Barbados All points 720 721# Belize 722# Whitman entirely disagrees with Shanks; go with Shanks. 723# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 724Rule Belize 1912 only - Apr 1 0:00 0 S 725Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 726Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 727Rule Belize 1973 only - Dec 5 0:00 1:00 D 728Rule Belize 1974 only - Feb 9 0:00 0 S 729Rule Belize 1982 only - Dec 18 0:00 1:00 D 730Rule Belize 1983 only - Feb 12 0:00 0 S 731# Zone NAME GMTOFF RULES FORMAT [UNTIL] 732Zone America/Belize -5:52:48 - LMT 1912 Apr 733 -6:00 Belize C%sT 734 735# ZONE-DESCR America Belize Belize All points 736 737# Bermuda 738# Zone NAME GMTOFF RULES FORMAT [UNTIL] 739Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 740 -4:00 - AST 1974 Apr 28 2:00 741 -4:00 Bahamas A%sT 742 743# ZONE-DESCR Atlantic Bermuda Bermuda All points 744 745# Cayman Is 746# Zone NAME GMTOFF RULES FORMAT [UNTIL] 747Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 748 -5:07 - KMT 1912 Feb # Kingston Mean Time 749 -5:00 - EST 750 751# ZONE-DESCR America Cayman Cayman_Islands All points 752 753# Clipperton 754# no information 755 756# Costa Rica 757# Shanks gives some very odd dates for 1991, and stops there. 758# For now, we won't guess further. 759# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 760Rule CR 1921 only - Jan 15 0:00 0 S 761Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 762Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 763Rule CR 1991 only - Jan 19 0:00 1:00 D 764Rule CR 1991 only - Jul 1 0:00 0 S 765# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 766# Zone NAME GMTOFF RULES FORMAT [UNTIL] 767Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 768 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 769 -6:00 CR C%sT 770# ZONE-DESCR America Costa_Rica Costa_Rica All points 771 772# Coco 773# no information; probably like America/Costa_Rica 774 775# Cuba 776 777# From Bob Devine (January 28, 1988): 778# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 779# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 780# (I think). 781 782# From U. S. Naval Observatory (January 19, 1989): 783# CUBA 5 H BEHIND UTC 784# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 785 786# From Shanks (1991): 787# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 788Rule Cuba 1925 only - Jul 19 12:00 0 S 789Rule Cuba 1928 only - Jun 10 0:00 1:00 D 790Rule Cuba 1928 only - Oct 10 0:00 0 S 791Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 792Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 793Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 794Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 795Rule Cuba 1965 only - Jun 1 0:00 1:00 D 796Rule Cuba 1965 only - Sep 30 0:00 0 S 797Rule Cuba 1966 only - May 29 0:00 1:00 D 798Rule Cuba 1966 only - Oct 2 0:00 0 S 799Rule Cuba 1967 only - Apr 8 0:00 1:00 D 800Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 801Rule Cuba 1968 only - Apr 14 0:00 1:00 D 802Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 803Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 804Rule Cuba 1972 1974 - Oct 8 0:00 0 S 805Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 806Rule Cuba 1978 only - May 7 0:00 1:00 D 807Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S 808Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 809Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 810Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S 811Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 812Rule Cuba 1990 only - Apr 1 0:00 1:00 D 813Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D 814 815# Zone NAME GMTOFF RULES FORMAT [UNTIL] 816Zone America/Havana -5:29:28 - LMT 1890 817 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 818 -5:00 Cuba C%sT 819 820# ZONE-DESCR America Havana Cuba All points 821 822# Dominica 823# Zone NAME GMTOFF RULES FORMAT [UNTIL] 824Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 825 -4:00 - AST 826 827# ZONE-DESCR America Dominica Dominica All points 828 829# Dominican Republic 830# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 831Rule DR 1933 only - Apr 1 12:00 0 S 832Rule DR 1966 only - Oct 30 0:00 1:00 D 833Rule DR 1967 only - Feb 28 0:00 0 S 834Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 835Rule DR 1970 only - Feb 21 0:00 0 S 836Rule DR 1971 only - Jan 20 0:00 0 S 837Rule DR 1972 1974 - Jan 21 0:00 0 S 838# Zone NAME GMTOFF RULES FORMAT [UNTIL] 839Zone America/Santo_Domingo -4:39:36 - LMT 1890 840 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 841 -5:00 DR E%sT 1974 Oct 27 842 -4:00 - AST 843 844# ZONE-DESCR America Santo_Domingo Dominican_Republic All points 845 846# El Salvador 847# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 848Rule Salv 1921 only - Jan 1 0:00 0 S 849Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 850Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 851# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 852# Zone NAME GMTOFF RULES FORMAT [UNTIL] 853Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 854 -6:00 Salv C%sT 855 856# ZONE-DESCR America El_Salvador El_Salvador All points 857 858# Grenada 859# Zone NAME GMTOFF RULES FORMAT [UNTIL] 860Zone America/Grenada -4:07:00 - LMT 1911 Jul 861 -4:00 - AST 862 863# ZONE-DESCR America Grenada Grenada All points 864 865# Guadeloupe 866# Zone NAME GMTOFF RULES FORMAT [UNTIL] 867Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 868 -4:00 - AST 869 870# ZONE-DESCR America Guadeloupe Guadeloupe All points 871 872# Guatemala 873# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 874Rule Guat 1918 only - Oct 5 0:00 0 S 875Rule Guat 1973 only - Nov 25 0:00 1:00 D 876Rule Guat 1974 only - Feb 24 0:00 0 S 877Rule Guat 1983 only - May 21 0:00 1:00 D 878Rule Guat 1983 only - Sep 22 0:00 0 S 879# Zone NAME GMTOFF RULES FORMAT [UNTIL] 880Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 881 -6:00 Guat C%sT 882 883# ZONE-DESCR America Guatemala Guatemala All points 884 885# Haiti 886# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 887Rule Haiti 1917 only - Jan 24 12:00 0 S 888Rule Haiti 1983 only - May 8 0:00 1:00 D 889Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 890Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 891Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D 892Rule Haiti 1988 max - Oct lastSun 2:00 0 S 893# Zone NAME GMTOFF RULES FORMAT [UNTIL] 894Zone America/Port-au-Prince -4:49:20 - LMT 1890 895 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 896 -5:00 Haiti E%sT 897 898# ZONE-DESCR America Port-au-Prince Haiti All points 899 900# Honduras 901# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 902# Zone NAME GMTOFF RULES FORMAT [UNTIL] 903Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 904 -6:00 Salv C%sT 905 906# ZONE-DESCR America Tegucigalpa Honduras All points 907 908# Jamaica 909 910# From Bob Devine (January 28, 1988): 911# Follows US rules. 912 913# From U. S. Naval Observatory (January 19, 1989): 914# JAMAICA 5 H BEHIND UTC 915 916# From Shanks (1991): 917# Zone NAME GMTOFF RULES FORMAT [UNTIL] 918Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 919 -5:07 - KMT 1912 Feb # Kingston Mean Time 920 -5:00 - EST 1974 Jan 6 2:00 921 -5:00 US E%sT 922 923# ZONE-DESCR America Jamaica Jamaica All points 924 925# Martinique 926# Zone NAME GMTOFF RULES FORMAT [UNTIL] 927Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 928 -4:04 - FFMT 1911 May # Fort-de-France MT 929 -4:00 - AST 1980 Apr 6 930 -4:00 1:00 ADT 1980 Sep 28 931 -4:00 - AST 932 933# ZONE-DESCR America Martinique Martinique All points 934 935# Montserrat 936# Zone NAME GMTOFF RULES FORMAT [UNTIL] 937Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth 938 -4:00 - AST 939 940# ZONE-DESCR America Montserrat Montserrat All points 941 942# Nicaragua 943# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 944Rule Nic 1975 only - Feb 16 0:00 0 S 945Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 946Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 947# Zone NAME GMTOFF RULES FORMAT [UNTIL] 948Zone America/Managua -5:45:08 - LMT 1890 949 -5:45 - MMT 1934 Jun 23 # Managua Mean Time 950 -6:00 - CST 1973 May 951 -5:00 - EST 1975 Feb 16 952 -6:00 Nic C%sT 953 954# ZONE-DESCR America Managua Nicaragua All points 955 956# Panama 957# Zone NAME GMTOFF RULES FORMAT [UNTIL] 958Zone America/Panama -5:18:08 - LMT 1890 959 -5:20 - PMT 1908 Apr 22 # Panama Mean Time 960 -5:00 - EST 961 962# ZONE-DESCR America Panama Panama All points 963 964# Puerto Rico 965# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 966# Zone NAME GMTOFF RULES FORMAT [UNTIL] 967Zone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan 968 -4:00 - AST 1942 May 3 969 -4:00 1:00 ADT 1945 Sep 30 2:00 970 -4:00 - AST 971 972# ZONE-DESCR America Puerto_Rico United_States Puerto Rico 973 974# St Kitts-Nevis 975# Zone NAME GMTOFF RULES FORMAT [UNTIL] 976Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 977 -4:00 - AST 978 979# ZONE-DESCR America St_Kitts St_Kitts_and_Nevis All points 980 981# St Lucia 982# Zone NAME GMTOFF RULES FORMAT [UNTIL] 983Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 984 -4:04 - CMT 1912 # Castries Mean Time 985 -4:00 - AST 986 987# ZONE-DESCR America St_Lucia St_Lucia All points 988 989# St Pierre and Miquelon 990# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 991# Zone NAME GMTOFF RULES FORMAT [UNTIL] 992Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 993 -4:00 - AST 1980 May 994 -3:00 Mont SP%sT 995 996# ZONE-DESCR America Miquelon France St. Pierre and Miquelon 997 998# St Vincent and the Grenadines 999# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1000Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1001 -4:05 - KMT 1912 # Kingstown Mean Time 1002 -4:00 - AST 1003 1004# ZONE-DESCR America St_Vincent St_Vincent All points 1005 1006# Turks and Caicos 1007# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1008Zone America/Grand_Turk -4:44:32 - LMT 1890 1009 -5:07 - KMT 1912 Feb # Kingston Mean Time 1010 -5:00 - EST 1979 Apr 29 2:00 1011 -5:00 US E%sT 1012 1013# ZONE-DESCR America Grand_Turk Turks_and_Caicos All points 1014 1015# Virgin Is (British and US) 1016# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1017Zone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1018 -4:00 - AST 1019 1020# ZONE-DESCR America Virgin United_States US Virgin Islands 1021# ZONE-DESCR America virgin United_Kingdom British Virgin Islands
| 352# From Shanks (1991): 353# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 354Rule StJohns 1884 only - Jan 1 0:00 0 S 355Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 356Rule StJohns 1917 only - Sep 17 2:00 0 S 357Rule StJohns 1918 only - Oct 31 2:00 0 S 358# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 359Rule StJohns 1919 only - May 5 23:00 1:00 D 360Rule StJohns 1919 only - Aug 12 23:00 0 S 361# For 1931-1935 Whitman gives Apr same date; go with Shanks. 362Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 363Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 364# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 365Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 366Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 367# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 368Rule StJohns 1942 only - Mar 1 0:00 1:00 D 369Rule StJohns 1942 only - Dec 31 0:00 0 S 370Rule StJohns 1943 only - May 30 0:00 1:00 D 371Rule StJohns 1943 only - Sep 5 0:00 0 S 372Rule StJohns 1944 only - Jul 10 0:00 1:00 D 373Rule StJohns 1944 only - Sep 2 0:00 0 S 374Rule StJohns 1945 only - Jan 1 0:00 1:00 D 375Rule StJohns 1945 only - Oct 7 2:00 0 S 376# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 377# Apr 30 - Sep 24; go with Shanks. 378Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 379Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 380Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 381Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 382Rule StJohns 1960 max - Oct lastSun 2:00 0 S 383Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 384Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D 385Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 386# St John's has an apostrophe, but Posix file names can't have apostrophes. 387# Zone NAME GMTOFF RULES FORMAT [UNTIL] 388Zone America/St_Johns -3:30:52 - LMT 1884 389 -3:31 StJohns N%sT 1935 Mar 30 390 -3:30 StJohns N%sT 391 392# ZONE-DESCR America St_Johns Canada Newfoundland 393 394# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 395Rule Halifax 1902 only - Jun 15 0:00 0 S 396Rule Halifax 1916 only - Apr 1 0:00 1:00 D 397Rule Halifax 1916 only - Oct 1 0:00 0 S 398Rule Halifax 1918 only - Apr 14 2:00 1:00 D 399Rule Halifax 1918 only - Oct 31 2:00 0 S 400Rule Halifax 1920 only - May 9 0:00 1:00 D 401Rule Halifax 1920 only - Aug 29 0:00 0 S 402Rule Halifax 1921 only - May 6 0:00 1:00 D 403Rule Halifax 1921 1922 - Sep 5 0:00 0 S 404Rule Halifax 1922 only - Apr 30 0:00 1:00 D 405Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 406Rule Halifax 1923 only - Sep 4 0:00 0 S 407Rule Halifax 1924 only - Sep 15 0:00 0 S 408Rule Halifax 1925 only - Sep 28 0:00 0 S 409Rule Halifax 1926 only - May 16 0:00 1:00 D 410Rule Halifax 1926 only - Sep 13 0:00 0 S 411Rule Halifax 1927 only - May 1 0:00 1:00 D 412Rule Halifax 1927 only - Sep 26 0:00 0 S 413Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 414Rule Halifax 1928 only - Sep 9 0:00 0 S 415Rule Halifax 1929 only - Sep 3 0:00 0 S 416Rule Halifax 1930 only - Sep 15 0:00 0 S 417Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 418Rule Halifax 1933 only - Apr 30 0:00 1:00 D 419Rule Halifax 1933 only - Oct 2 0:00 0 S 420Rule Halifax 1934 only - May 20 0:00 1:00 D 421Rule Halifax 1934 only - Sep 16 0:00 0 S 422Rule Halifax 1935 only - Jun 2 0:00 1:00 D 423Rule Halifax 1935 only - Sep 30 0:00 0 S 424Rule Halifax 1936 only - Jun 1 0:00 1:00 D 425Rule Halifax 1936 only - Sep 14 0:00 0 S 426Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 427Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 428Rule Halifax 1939 only - May 28 0:00 1:00 D 429Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 430Rule Halifax 1942 only - Feb 9 2:00 1:00 D 431Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S 432Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 433Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 434Rule Halifax 1962 max - Oct lastSun 2:00 0 S 435Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 436# Zone NAME GMTOFF RULES FORMAT [UNTIL] 437Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 438 -4:00 Halifax A%sT 439 440# ZONE-DESCR America Halifax Canada Atlantic time 441 442# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 443Rule Mont 1884 only - Jan 1 0:00 0 S 444Rule Mont 1917 only - Mar 25 2:00 1:00 D 445Rule Mont 1917 only - Apr 24 0:00 0 S 446Rule Mont 1918 only - Apr 14 2:00 1:00 D 447Rule Mont 1918 only - Oct 31 2:00 0 S 448Rule Mont 1919 only - Mar 31 2:30 1:00 D 449Rule Mont 1919 only - Oct 25 2:30 0 S 450Rule Mont 1920 only - May 2 2:30 1:00 D 451Rule Mont 1920 only - Oct 3 2:30 0 S 452Rule Mont 1921 only - May 1 2:00 1:00 D 453Rule Mont 1921 only - Oct 2 2:30 0 S 454Rule Mont 1922 only - Apr 30 2:00 1:00 D 455Rule Mont 1922 only - Oct 1 2:30 0 S 456Rule Mont 1924 only - May 17 2:00 1:00 D 457Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 458Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 459Rule Mont 1927 only - May 1 0:00 1:00 D 460Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 461Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 462Rule Mont 1932 only - May 1 0:00 1:00 D 463Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 464Rule Mont 1933 only - Oct 1 0:00 0 S 465Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 466Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 467Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 468Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 469Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 470Rule Mont 1957 max - Oct lastSun 2:00 0 S 471Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 472# Zone NAME GMTOFF RULES FORMAT [UNTIL] 473Zone America/Montreal -4:54:16 - LMT 1884 474 -5:00 Mont E%sT 475 476# ZONE-DESCR America Montreal Canada Eastern time 477 478# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 479Rule Winn 1887 only - Jul 16 0:00 0 S 480Rule Winn 1916 only - Apr 23 0:00 1:00 D 481Rule Winn 1916 only - Sep 17 0:00 0 S 482Rule Winn 1918 only - Apr 14 2:00 1:00 D 483Rule Winn 1918 only - Oct 31 2:00 0 S 484Rule Winn 1937 only - May 16 2:00 1:00 D 485Rule Winn 1937 only - Sep 23 2:00 0 S 486Rule Winn 1942 only - Feb 9 2:00 1:00 D 487Rule Winn 1945 only - Sep lastSun 2:00 0 S 488Rule Winn 1946 only - May 12 2:00 1:00 D 489Rule Winn 1946 only - Oct 13 2:00 0 S 490Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 491Rule Winn 1947 1958 - Sep lastSun 2:00 0 S 492Rule Winn 1948 only - May 1 2:00 1:00 D 493Rule Winn 1948 1960 - Apr lastSun 2:00 1:00 D 494Rule Winn 1959 only - Oct lastSun 2:00 0 S 495Rule Winn 1960 only - Sep lastSun 2:00 0 S 496Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 497Rule Winn 1963 only - Sep lastSun 2:00 0 S 498Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 499Rule Winn 1966 max - Sep lastSun 2:00 0 S 500Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 501# Zone NAME GMTOFF RULES FORMAT [UNTIL] 502Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 503 -6:00 Winn C%sT 504 505# ZONE-DESCR America Winnipeg Canada Manitoba 506 507# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 508Rule Regina 1905 only - Sep 1 0:00 0 S 509Rule Regina 1918 only - Apr 14 2:00 1:00 D 510Rule Regina 1918 only - Oct 31 2:00 0 S 511Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 512Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 513Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 514Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 515Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 516Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 517Rule Regina 1942 only - Feb 9 2:00 1:00 D 518Rule Regina 1945 only - Sep lastSun 2:00 0 S 519Rule Regina 1946 only - Apr 14 2:00 1:00 D 520Rule Regina 1946 only - Oct 13 2:00 0 S 521Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D 522Rule Regina 1947 1959 - Sep lastSun 2:00 0 S 523# Zone NAME GMTOFF RULES FORMAT [UNTIL] 524Zone America/Regina -6:58:36 - LMT 1905 Sep 525 -7:00 Regina M%sT 1966 Apr 15 526 -6:00 - CST 527 528# ZONE-DESCR America Regina Canada Saskatchewan 529 530# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 531Rule Edm 1906 only - Sep 1 0:00 0 S 532Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 533Rule Edm 1918 only - Oct 31 2:00 0 S 534Rule Edm 1919 only - May 27 2:00 0 S 535Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 536Rule Edm 1920 only - Oct lastSun 2:00 0 S 537Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 538Rule Edm 1942 only - Feb 9 2:00 1:00 D 539Rule Edm 1945 only - Sep lastSun 2:00 0 S 540Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 541Rule Edm 1947 only - Sep lastSun 2:00 0 S 542Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 543Rule Edm 1967 only - Oct lastSun 2:00 0 S 544Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 545Rule Edm 1969 only - Oct lastSun 2:00 0 S 546Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 547Rule Edm 1972 max - Oct lastSun 2:00 0 S 548Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 549# Zone NAME GMTOFF RULES FORMAT [UNTIL] 550Zone America/Edmonton -7:33:52 - LMT 1906 Sep 551 -7:00 Edm M%sT 552 553# ZONE-DESCR America Edmonton Canada Alberta 554 555# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 556Rule Vanc 1884 only - Jan 1 0:00 0 S 557Rule Vanc 1918 only - Apr 14 2:00 1:00 D 558Rule Vanc 1918 only - Oct 31 2:00 0 S 559Rule Vanc 1942 only - Feb 9 2:00 1:00 D 560Rule Vanc 1945 only - Sep 30 2:00 0 S 561Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 562Rule Vanc 1946 only - Oct 13 2:00 0 S 563Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 564Rule Vanc 1962 max - Oct lastSun 2:00 0 S 565Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 566# Zone NAME GMTOFF RULES FORMAT [UNTIL] 567Zone America/Vancouver -8:12:28 - LMT 1884 568 -8:00 Vanc P%sT 569 570# ZONE-DESCR America Vancouver Canada British Columbia 571 572# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 573Rule Yukon 1900 only - Jan 1 0:00 0 S 574Rule Yukon 1918 only - Apr 14 2:00 1:00 D 575Rule Yukon 1918 only - Oct 27 2:00 0 S 576Rule Yukon 1919 only - May 25 2:00 1:00 D 577Rule Yukon 1919 only - Nov 1 0:00 0 S 578Rule Yukon 1942 only - Feb 9 2:00 1:00 D 579Rule Yukon 1965 only - Apr 25 0:00 1:00 D 580Rule Yukon 1965 only - Oct 31 2:00 0 S 581Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D 582Rule Yukon 1980 max - Oct lastSun 2:00 0 S 583Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D 584# Zone NAME GMTOFF RULES FORMAT [UNTIL] 585Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 586 -9:00 Yukon Y%sT 1966 Jul 587 -8:00 Yukon P%sT 588# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28. 589 590# ZONE-DESCR America Whitehorse Canada Yukon Territory 591 592############################################################################### 593 594# Mexico 595 596# From Guy Harris: 597# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 598# Rules prior to 1987 are unknown. 599# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 600# observe DST." This is presumably Baja California Norte, above 28th parallel, 601# as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific 602# Coast (States of Sinaloa and Sonora)." 603 604# From Bob Devine (January 28, 1988): 605# The Federal District (where Mexico City is) has observed [DST] several 606# times but not recently. 607# 608# I don't where to drawn the line in the North Baja area. 28th latitude 609# sounds good -- but it may be higher (how far [d]o radio stations from 610# San Diego affect culture?). 611# 612# The dates of DST probably go back to 1981. The rules are the same as 613# US's. This is going to be a headache for US presidential electi[o]n years! 614 615# From Arthur David Olson (February 13, 1988) 616# Since the 1981 starting date is only "probable," we'll keep the 1987 617# starting date below. 618 619# From U. S. Naval Observatory (January 19, 1989): 620# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 621# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 622# MEXICO BAJA CAL N OF SINALOA AND SONORA) 623# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 624# MEXICO BAJA CAL N - OCT 29 625# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 626# MEXICO BAJA CAL N - 0CT 29 627# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 628# MEXICO COAHUILA, NUEVO LEON, 629# MEXICO TAMAULIPAS 630# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 631# MEXICO COAHUILA, NUEVO LEON, 632# MEXICO TAMAULIPAS APR 3 - OCT 29 633# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 634# MEXICO CAMPECHE, QUINTANA ROO AND 635# MEXICO YUCATAN 636 637# From Arthur David Olson (January 21, 1989): 638# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 639# USNO claims there should be four Mexican zones rather than three: 640# a zone that's GMT-8 with DST; a zone that's always GMT-7; 641# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 642 643# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 644# Shanks also says there are four zones, but disagrees about the fourth. 645# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 646 647# From Shanks (1991): 648# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 649Rule Mexico 1922 only - Jan 1 0:00 0 S 650Rule Mexico 1939 only - Feb 5 0:00 1:00 D 651Rule Mexico 1939 only - Jun 25 0:00 0 S 652Rule Mexico 1940 only - Dec 9 0:00 1:00 D 653Rule Mexico 1941 only - Apr 1 0:00 0 S 654Rule Mexico 1943 only - Dec 16 0:00 1:00 D 655Rule Mexico 1944 only - May 1 0:00 0 S 656Rule Mexico 1950 only - Feb 12 0:00 1:00 D 657Rule Mexico 1950 only - Jul 30 0:00 0 S 658Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 659Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S 660Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S 661# Zone NAME GMTOFF RULES FORMAT [UNTIL] 662Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 663 -7:00 - MST 1927 Jun 10 23:00 664 -6:00 - CST 1930 Nov 15 665 -7:00 - MST 1931 May 1 23:00 666 -6:00 - CST 1931 Oct 667 -7:00 - MST 1932 Mar 30 23:00 668 -6:00 Mexico C%sT 669# ZONE-DESCR America Mexico_City Mexico Mexico City 670Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 671 -7:00 - MST 1927 Jun 10 23:00 672 -6:00 - CST 1930 Nov 15 673 -7:00 - MST 1931 May 1 23:00 674 -6:00 - CST 1931 Oct 675 -7:00 - MST 1932 Mar 30 23:00 676 -6:00 - CST 1942 Apr 677 -7:00 - MST 1949 Jan 14 678 -8:00 - PST 1970 679 -7:00 - MST 680# ZONE-DESCR America Mazatlan Mexico Mazatlan 681Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 682 -8:00 - PST 1927 Jun 10 23:00 683 -7:00 - MST 1930 Nov 16 684 -8:00 - PST 1942 Apr 685 -7:00 - MST 1949 Jan 14 686 -8:00 BajaN P%sT 1967 Apr lastSun 2:00 687 -8:00 US P%sT 688# ZONE-DESCR America Tijuana Mexico Baja California Norte 689Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 690 -8:00 - PST 1927 Jun 10 23:00 691 -7:00 - MST 1930 Nov 16 692 -8:00 - PST 1942 Apr 693 -7:00 - MST 1949 Jan 14 694 -8:00 - PST 695# ZONE-DESCR America Ensenada Mexico Ensenada 696 697# 698# Revillagigedo Is 699# no information 700 701############################################################################### 702 703# Anguilla 704# Zone NAME GMTOFF RULES FORMAT [UNTIL] 705Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 706 -4:00 - AST 707 708# ZONE-DESCR America Anguilla Anguilla All points 709 710# Antigua and Barbuda 711# Zone NAME GMTOFF RULES FORMAT [UNTIL] 712Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 713 -5:00 - EST 1951 714 -4:00 - AST 715 716# ZONE-DESCR America Antigua Antigua All points 717 718# Bahamas 719# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 720Rule Bahamas 1912 only - Mar 2 0:00 0 S 721Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 722Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 723Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 724# Zone NAME GMTOFF RULES FORMAT [UNTIL] 725Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 726 -5:00 Bahamas E%sT 727 728# ZONE-DESCR America Nassau Bahamas All points 729 730# Barbados 731# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 732Rule Barb 1932 only - Jan 1 0:00 0 S 733Rule Barb 1977 only - Jun 12 2:00 1:00 D 734Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 735Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 736Rule Barb 1979 only - Sep 30 2:00 0 S 737Rule Barb 1980 only - Sep 25 2:00 0 S 738# Zone NAME GMTOFF RULES FORMAT [UNTIL] 739Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 740 -3:58 - BMT 1932 # Bridgetown Mean Time 741 -4:00 Barb A%sT 742 743# ZONE-DESCR America Barbados Barbados All points 744 745# Belize 746# Whitman entirely disagrees with Shanks; go with Shanks. 747# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 748Rule Belize 1912 only - Apr 1 0:00 0 S 749Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 750Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 751Rule Belize 1973 only - Dec 5 0:00 1:00 D 752Rule Belize 1974 only - Feb 9 0:00 0 S 753Rule Belize 1982 only - Dec 18 0:00 1:00 D 754Rule Belize 1983 only - Feb 12 0:00 0 S 755# Zone NAME GMTOFF RULES FORMAT [UNTIL] 756Zone America/Belize -5:52:48 - LMT 1912 Apr 757 -6:00 Belize C%sT 758 759# ZONE-DESCR America Belize Belize All points 760 761# Bermuda 762# Zone NAME GMTOFF RULES FORMAT [UNTIL] 763Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 764 -4:00 - AST 1974 Apr 28 2:00 765 -4:00 Bahamas A%sT 766 767# ZONE-DESCR Atlantic Bermuda Bermuda All points 768 769# Cayman Is 770# Zone NAME GMTOFF RULES FORMAT [UNTIL] 771Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 772 -5:07 - KMT 1912 Feb # Kingston Mean Time 773 -5:00 - EST 774 775# ZONE-DESCR America Cayman Cayman_Islands All points 776 777# Clipperton 778# no information 779 780# Costa Rica 781# Shanks gives some very odd dates for 1991, and stops there. 782# For now, we won't guess further. 783# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 784Rule CR 1921 only - Jan 15 0:00 0 S 785Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 786Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 787Rule CR 1991 only - Jan 19 0:00 1:00 D 788Rule CR 1991 only - Jul 1 0:00 0 S 789# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 790# Zone NAME GMTOFF RULES FORMAT [UNTIL] 791Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 792 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 793 -6:00 CR C%sT 794# ZONE-DESCR America Costa_Rica Costa_Rica All points 795 796# Coco 797# no information; probably like America/Costa_Rica 798 799# Cuba 800 801# From Bob Devine (January 28, 1988): 802# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 803# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 804# (I think). 805 806# From U. S. Naval Observatory (January 19, 1989): 807# CUBA 5 H BEHIND UTC 808# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 809 810# From Shanks (1991): 811# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 812Rule Cuba 1925 only - Jul 19 12:00 0 S 813Rule Cuba 1928 only - Jun 10 0:00 1:00 D 814Rule Cuba 1928 only - Oct 10 0:00 0 S 815Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 816Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 817Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 818Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 819Rule Cuba 1965 only - Jun 1 0:00 1:00 D 820Rule Cuba 1965 only - Sep 30 0:00 0 S 821Rule Cuba 1966 only - May 29 0:00 1:00 D 822Rule Cuba 1966 only - Oct 2 0:00 0 S 823Rule Cuba 1967 only - Apr 8 0:00 1:00 D 824Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 825Rule Cuba 1968 only - Apr 14 0:00 1:00 D 826Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 827Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 828Rule Cuba 1972 1974 - Oct 8 0:00 0 S 829Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 830Rule Cuba 1978 only - May 7 0:00 1:00 D 831Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S 832Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 833Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 834Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S 835Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 836Rule Cuba 1990 only - Apr 1 0:00 1:00 D 837Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D 838 839# Zone NAME GMTOFF RULES FORMAT [UNTIL] 840Zone America/Havana -5:29:28 - LMT 1890 841 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 842 -5:00 Cuba C%sT 843 844# ZONE-DESCR America Havana Cuba All points 845 846# Dominica 847# Zone NAME GMTOFF RULES FORMAT [UNTIL] 848Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 849 -4:00 - AST 850 851# ZONE-DESCR America Dominica Dominica All points 852 853# Dominican Republic 854# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 855Rule DR 1933 only - Apr 1 12:00 0 S 856Rule DR 1966 only - Oct 30 0:00 1:00 D 857Rule DR 1967 only - Feb 28 0:00 0 S 858Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 859Rule DR 1970 only - Feb 21 0:00 0 S 860Rule DR 1971 only - Jan 20 0:00 0 S 861Rule DR 1972 1974 - Jan 21 0:00 0 S 862# Zone NAME GMTOFF RULES FORMAT [UNTIL] 863Zone America/Santo_Domingo -4:39:36 - LMT 1890 864 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 865 -5:00 DR E%sT 1974 Oct 27 866 -4:00 - AST 867 868# ZONE-DESCR America Santo_Domingo Dominican_Republic All points 869 870# El Salvador 871# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 872Rule Salv 1921 only - Jan 1 0:00 0 S 873Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 874Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 875# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 876# Zone NAME GMTOFF RULES FORMAT [UNTIL] 877Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 878 -6:00 Salv C%sT 879 880# ZONE-DESCR America El_Salvador El_Salvador All points 881 882# Grenada 883# Zone NAME GMTOFF RULES FORMAT [UNTIL] 884Zone America/Grenada -4:07:00 - LMT 1911 Jul 885 -4:00 - AST 886 887# ZONE-DESCR America Grenada Grenada All points 888 889# Guadeloupe 890# Zone NAME GMTOFF RULES FORMAT [UNTIL] 891Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 892 -4:00 - AST 893 894# ZONE-DESCR America Guadeloupe Guadeloupe All points 895 896# Guatemala 897# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 898Rule Guat 1918 only - Oct 5 0:00 0 S 899Rule Guat 1973 only - Nov 25 0:00 1:00 D 900Rule Guat 1974 only - Feb 24 0:00 0 S 901Rule Guat 1983 only - May 21 0:00 1:00 D 902Rule Guat 1983 only - Sep 22 0:00 0 S 903# Zone NAME GMTOFF RULES FORMAT [UNTIL] 904Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 905 -6:00 Guat C%sT 906 907# ZONE-DESCR America Guatemala Guatemala All points 908 909# Haiti 910# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 911Rule Haiti 1917 only - Jan 24 12:00 0 S 912Rule Haiti 1983 only - May 8 0:00 1:00 D 913Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 914Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 915Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D 916Rule Haiti 1988 max - Oct lastSun 2:00 0 S 917# Zone NAME GMTOFF RULES FORMAT [UNTIL] 918Zone America/Port-au-Prince -4:49:20 - LMT 1890 919 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 920 -5:00 Haiti E%sT 921 922# ZONE-DESCR America Port-au-Prince Haiti All points 923 924# Honduras 925# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 926# Zone NAME GMTOFF RULES FORMAT [UNTIL] 927Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 928 -6:00 Salv C%sT 929 930# ZONE-DESCR America Tegucigalpa Honduras All points 931 932# Jamaica 933 934# From Bob Devine (January 28, 1988): 935# Follows US rules. 936 937# From U. S. Naval Observatory (January 19, 1989): 938# JAMAICA 5 H BEHIND UTC 939 940# From Shanks (1991): 941# Zone NAME GMTOFF RULES FORMAT [UNTIL] 942Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 943 -5:07 - KMT 1912 Feb # Kingston Mean Time 944 -5:00 - EST 1974 Jan 6 2:00 945 -5:00 US E%sT 946 947# ZONE-DESCR America Jamaica Jamaica All points 948 949# Martinique 950# Zone NAME GMTOFF RULES FORMAT [UNTIL] 951Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 952 -4:04 - FFMT 1911 May # Fort-de-France MT 953 -4:00 - AST 1980 Apr 6 954 -4:00 1:00 ADT 1980 Sep 28 955 -4:00 - AST 956 957# ZONE-DESCR America Martinique Martinique All points 958 959# Montserrat 960# Zone NAME GMTOFF RULES FORMAT [UNTIL] 961Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth 962 -4:00 - AST 963 964# ZONE-DESCR America Montserrat Montserrat All points 965 966# Nicaragua 967# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 968Rule Nic 1975 only - Feb 16 0:00 0 S 969Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 970Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 971# Zone NAME GMTOFF RULES FORMAT [UNTIL] 972Zone America/Managua -5:45:08 - LMT 1890 973 -5:45 - MMT 1934 Jun 23 # Managua Mean Time 974 -6:00 - CST 1973 May 975 -5:00 - EST 1975 Feb 16 976 -6:00 Nic C%sT 977 978# ZONE-DESCR America Managua Nicaragua All points 979 980# Panama 981# Zone NAME GMTOFF RULES FORMAT [UNTIL] 982Zone America/Panama -5:18:08 - LMT 1890 983 -5:20 - PMT 1908 Apr 22 # Panama Mean Time 984 -5:00 - EST 985 986# ZONE-DESCR America Panama Panama All points 987 988# Puerto Rico 989# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 990# Zone NAME GMTOFF RULES FORMAT [UNTIL] 991Zone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan 992 -4:00 - AST 1942 May 3 993 -4:00 1:00 ADT 1945 Sep 30 2:00 994 -4:00 - AST 995 996# ZONE-DESCR America Puerto_Rico United_States Puerto Rico 997 998# St Kitts-Nevis 999# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1000Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 1001 -4:00 - AST 1002 1003# ZONE-DESCR America St_Kitts St_Kitts_and_Nevis All points 1004 1005# St Lucia 1006# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1007Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 1008 -4:04 - CMT 1912 # Castries Mean Time 1009 -4:00 - AST 1010 1011# ZONE-DESCR America St_Lucia St_Lucia All points 1012 1013# St Pierre and Miquelon 1014# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 1015# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1016Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 1017 -4:00 - AST 1980 May 1018 -3:00 Mont SP%sT 1019 1020# ZONE-DESCR America Miquelon France St. Pierre and Miquelon 1021 1022# St Vincent and the Grenadines 1023# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1024Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1025 -4:05 - KMT 1912 # Kingstown Mean Time 1026 -4:00 - AST 1027 1028# ZONE-DESCR America St_Vincent St_Vincent All points 1029 1030# Turks and Caicos 1031# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1032Zone America/Grand_Turk -4:44:32 - LMT 1890 1033 -5:07 - KMT 1912 Feb # Kingston Mean Time 1034 -5:00 - EST 1979 Apr 29 2:00 1035 -5:00 US E%sT 1036 1037# ZONE-DESCR America Grand_Turk Turks_and_Caicos All points 1038 1039# Virgin Is (British and US) 1040# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1041Zone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1042 -4:00 - AST 1043 1044# ZONE-DESCR America Virgin United_States US Virgin Islands 1045# ZONE-DESCR America virgin United_Kingdom British Virgin Islands
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