northamerica revision 20094
1# @(#)northamerica 7.29 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> (1994-08-17): 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 Paul Eggert <eggert@twinsun.com> (1995-12-19): 18# A good source for time zone historical data in the US is 19# Thomas G. Shanks, The American Atlas (5th edition), 20# San Diego: ACS Publications, Inc. (1991). 21# Make sure you have the errata sheet; the book is somewhat useless without it. 22# It is the source for the US and Puerto Rico entries below. 23 24# From Paul Eggert (1996-06-12): 25# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 26# in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784). 27# Not everyone is happy with the results: 28# 29# I don't really care how time is reckoned so long as there is some 30# agreement about it, but I object to being told that I am saving 31# daylight when my reason tells me that I am doing nothing of the kind. 32# I even object to the implication that I am wasting something 33# valuable if I stay in bed after the sun has risen. As an admirer 34# of moonlight I resent the bossy insistence of those who want to 35# reduce my time for enjoying it. At the back of the Daylight Saving 36# scheme I detect the bony, blue-fingered hand of Puritanism, eager 37# to push people into bed earlier, and get them up earlier, to make 38# them healthy, wealthy and wise in spite of themselves. 39# 40# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 41 42# From Arthur David Olson: 43# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 44# See, for example, the front page of the Saturday, 1974-10-26 45# and Sunday, 1974-10-27 editions of the Washington Post. 46 47# From Arthur David Olson: 48# Before the Uniform Time Act of 1966 took effect in 1967, observance of 49# Daylight Saving Time in the US was by local option, except during wartime. 50 51# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 52Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War 53Rule US 1918 1919 - Oct lastSun 2:00 0 S 54Rule US 1942 only - Feb 9 2:00 1:00 W # War 55Rule US 1945 only - Sep 30 2:00 0 S 56Rule US 1967 max - Oct lastSun 2:00 0 S 57Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 58Rule US 1974 only - Jan 6 2:00 1:00 D 59Rule US 1975 only - Feb 23 2:00 1:00 D 60Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 61Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 62 63# From Bob Devine (1988-01-28): 64# ...Alaska (and Hawaii) had the timezone names changed in 1967. 65# old new 66# Pacific Standard Time(PST) -same- 67# Yukon Standard Time(YST) -same- 68# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 69# Nome Standard Time (NT) Bering Standard Time (BST) 70# 71# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 72# The YST zone now covers nearly all of the state, AHST just part 73# of the Aleutian islands. No DST. 74 75# From Paul Eggert (1995-12-19): 76# The tables below use `NST', not `NT', for Nome Standard Time. 77# I invented `CAWT' for Central Alaska War Time. 78 79# From U. S. Naval Observatory (1989-01-19): 80# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 81# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 82# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 83# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 84# USA MOUNTAIN 7 H BEHIND UTC DENVER 85# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 86# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 87# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 88# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 89# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 90# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 91# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 92# USA HAWAII 10 H BEHIND UTC 93# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 94 95# From Arthur David Olson (1989-01-21): 96# The above dates are for 1988. 97# Note the "AKST" and "AKDT" abbreviations, the claim that there's 98# no DST in Samoa, and the claim that there is DST in Alaska and the 99# Aleutians. 100 101# From Arthur David Olson (1988-02-13): 102# Legal standard time zone names, from United States Code (1982 Edition and 103# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 104# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 105# took effect), as explained in sections 263 and 261: 106# (none) 107# United States standard eastern time 108# United States standard mountain time 109# United States standard central time 110# United States standard Pacific time 111# (none) 112# United States standard Alaska time 113# (none) 114# Next, names from 1967-04-01 until 1983-11-30 (the date for 115# public law 98-181): 116# Atlantic standard time 117# eastern standard time 118# central standard time 119# mountain standard time 120# Pacific standard time 121# Yukon standard time 122# Alaska-Hawaii standard time 123# Bering standard time 124# And after 1983-11-30: 125# Atlantic standard time 126# eastern standard time 127# central standard time 128# mountain standard time 129# Pacific standard time 130# Alaska standard time 131# Hawaii-Aleutian standard time 132# Samoa standard time 133# The law doesn't give abbreviations. 134# 135# From Paul Eggert (1995-12-19): 136# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. 137# Go with Shanks. 138 139# US Eastern time, represented by New York 140# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 141Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 142Rule NYC 1920 only - Oct lastSun 2:00 0 S 143Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 144Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 145Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 146# Zone NAME GMTOFF RULES FORMAT [UNTIL] 147Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 148 -5:00 US E%sT 1920 149 -5:00 NYC E%sT 1942 150 -5:00 US E%sT 1946 151 -5:00 NYC E%sT 1967 152 -5:00 US E%sT 153 154# US Central time, represented by Chicago 155# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 156Rule Chicago 1920 only - Jun 13 2:00 1:00 D 157Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 158Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 159Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 160Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 161Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 162# Zone NAME GMTOFF RULES FORMAT [UNTIL] 163Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 164 -6:00 US C%sT 1920 165 -6:00 Chicago C%sT 1936 Mar 1 2:00 166 -5:00 - EST 1936 Nov 15 2:00 167 -6:00 Chicago C%sT 1942 168 -6:00 US C%sT 1946 169 -6:00 Chicago C%sT 1967 170 -6:00 US C%sT 171 172# US Mountain time, represented by Denver 173# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 174Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 175Rule Denver 1920 only - Oct lastSun 2:00 0 S 176Rule Denver 1921 only - May 22 2:00 0 S 177Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 178Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 179# Zone NAME GMTOFF RULES FORMAT [UNTIL] 180Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 181 -7:00 US M%sT 1920 182 -7:00 Denver M%sT 1942 183 -7:00 US M%sT 1946 184 -7:00 Denver M%sT 1967 185 -7:00 US M%sT 186 187# US Pacific time, represented by Los Angeles 188# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 189Rule CA 1948 only - Mar 14 2:00 1:00 D 190Rule CA 1949 only - Jan 1 2:00 0 S 191Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 192Rule CA 1950 1961 - Sep lastSun 2:00 0 S 193Rule CA 1962 1966 - Oct lastSun 2:00 0 S 194# Zone NAME GMTOFF RULES FORMAT [UNTIL] 195Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 196 -8:00 US P%sT 1946 197 -8:00 CA P%sT 1967 198 -8:00 US P%sT 199 200# Alaska 201# AK%sT is the modern abbreviation for -9:00 per USNO. 202# 203# From Paul Eggert (1995-12-19): 204# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 205# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 206# This was on 1867-10-18. We omit this transition, since we can't represent 207# changes from Julian to Gregorian. 208# 209# Zone NAME GMTOFF RULES FORMAT [UNTIL] 210Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00 211 -8:00 - PST 1942 212 -8:00 US P%sT 1946 213 -8:00 - PST 1969 214 -8:00 US P%sT 1983 Oct 30 2:00 215 -9:00 US AK%sT 216Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00 217 -9:00 - YST 1942 218 -9:00 US Y%sT 1946 219 -9:00 - YST 1969 220 -9:00 US Y%sT 1983 Oct 30 2:00 221 -9:00 US AK%sT 222Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00 223 -10:00 - CAT 1942 224 -10:00 US CAT/CAWT 1946 225 -10:00 - CAT 1967 Apr 226 -10:00 - AHST 1969 227 -10:00 US AH%sT 1983 Oct 30 2:00 228 -9:00 US AK%sT 229Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00 230 -11:00 - NST 1942 231 -11:00 US N%sT 1946 232 -11:00 - NST 1967 Apr 233 -11:00 - BST 1969 234 -11:00 US B%sT 1983 Oct 30 2:00 235 -9:00 US AK%sT 236Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00 237 -11:00 - NST 1942 238 -11:00 US N%sT 1946 239 -11:00 - NST 1967 Apr 240 -11:00 - BST 1969 241 -11:00 US B%sT 1983 Oct 30 2:00 242 -10:00 US HA%sT 243# Shanks writes that part of southwest Alaska (e.g. Aniak) 244# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 245# and another part (e.g. Akiak) made the same switch five weeks later. 246# These switches don't quite make our 1970 cutoff. 247 248# Hawaii 249# 250# From Arthur David Olson: 251# And then there's Hawaii. 252# DST was observed for one day in 1933; 253# standard time was changed by half an hour in 1947; 254# it's always standard as of 1986. 255# 256# From Paul Eggert: 257# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 258# 259Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 260 -10:30 - HST 1933 Apr 30 2:00 261 -10:30 1:00 HDT 1933 May 21 2:00 262 -10:30 US H%sT 1947 Jun 8 2:00 263 -10:00 - HST 264 265Zone Pacific/Midway -11:49:28 - LMT 1901 266 -11:00 - NST 1967 Apr # N=Nome 267 -11:00 - BST 1983 Nov 30 # B=Bering 268 -11:00 - SST # S=Samoa 269 270# Now we turn to US areas that have diverged from the consensus since 1970. 271 272# Arizona mostly uses MST. 273Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 274 -7:00 US M%sT 1944 Jan 1 00:01 275 -7:00 - MST 1944 Mar 17 00:01 276 -7:00 US M%sT 1944 Oct 1 00:01 277 -7:00 - MST 1967 278 -7:00 US M%sT 1968 279 -7:00 - MST 280# From Arthur David Olson (1988-02-13): 281# A writer from the Inter Tribal Council of Arizona, Inc., 282# notes in private correspondence dated 12/28/87 that "Presently, only the 283# Navajo Nation participates in the Daylight Saving Time policy, due to its 284# large size and location in three states." (The "only" means that other 285# tribal nations don't use DST.) 286 287Link America/Denver America/Shiprock 288 289# Southern Idaho and eastern Oregon switched four weeks late in 1974. 290# Zone NAME GMTOFF RULES FORMAT [UNTIL] 291Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 292 -8:00 US P%sT 1923 May 13 2:00 293 -7:00 US M%sT 1974 294 -7:00 - MST 1974 Feb 3 2:00 295 -7:00 US M%sT 296 297# Indiana 298# 299# From Paul Eggert (1995-12-19): 300# Indiana generally observes either EST all year, or CST/CDT, 301# but areas near Cincinnati and Louisville use those cities' timekeeping 302# and in 1969 and 1970 the whole state observed daylight time; 303# and there are other exceptions as noted below. 304# Shanks partitions Indiana into 345 regions, each with its own time history, 305# and writes ``Even newspaper reports present contradictory information.'' 306# Fortunately, most of the complexity occurred before our cutoff date of 1970. 307# 308# Since 1970, EST-only Indiana has been like America/Indianapolis, 309# with exceptions noted below for Crawford, Starke, and Switzerland counties. 310# The parts of Indiana not listed below have been like America/Chicago, 311# America/Louisville, or America/New_York. 312# 313# Other than Indianapolis, the Indiana place names are so nondescript 314# that they would be ambiguous if we left them at the `America' level. 315# So we reluctantly put them all in a subdirectory `America/Indiana'. 316# 317# Most of EST-only Indiana last observed DST in 1970. 318# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 319Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 320Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 321Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 322# Zone NAME GMTOFF RULES FORMAT [UNTIL] 323Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 324 -6:00 US C%sT 1920 325 -6:00 Indianapolis C%sT 1942 326 -6:00 US C%sT 1946 327 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 328 -5:00 - EST 1957 Sep 29 2:00 329 -6:00 - CST 1958 Apr 27 2:00 330 -5:00 - EST 1969 331 -5:00 US E%sT 1971 332 -5:00 - EST 333Link America/Indianapolis America/Indiana/Indianapolis 334# 335# Part of Crawford County, Indiana, last observed DST in 1975, 336# and left its clocks alone in 1974. 337# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 338Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 339Rule Marengo 1951 only - Sep lastSun 2:00 0 S 340Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 341Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 342# Zone NAME GMTOFF RULES FORMAT [UNTIL] 343Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 344 -6:00 US C%sT 1951 345 -6:00 Marengo C%sT 1961 Apr 30 2:00 346 -5:00 - EST 1969 347 -5:00 US E%sT 1974 Jan 6 2:00 348 -6:00 1:00 CDT 1974 Oct 27 2:00 349 -5:00 US E%sT 1976 350 -5:00 - EST 351# 352# Starke County, Indiana 353# From Arthur David Olson (1991-10-28): 354# An article on page A3 of the Sunday, 1991-10-27 Washington Post 355# notes that Starke County switched from Central time to Eastern time as of 356# 1991-10-27. 357# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 358Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 359Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 360Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 361Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 362Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 363# Zone NAME GMTOFF RULES FORMAT [UNTIL] 364Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 365 -6:00 US C%sT 1947 366 -6:00 Starke C%sT 1962 Apr 29 2:00 367 -5:00 - EST 1963 Oct 27 2:00 368 -6:00 US C%sT 1991 Oct 27 2:00 369 -5:00 - EST 370# 371# Switzerland County, Indiana, last observed DST in 1972. 372# Zone NAME GMTOFF RULES FORMAT [UNTIL] 373Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 374 -6:00 US C%sT 1954 Apr 25 2:00 375 -5:00 - EST 1969 376 -5:00 US E%sT 1973 377 -5:00 - EST 378 379# Part of Kentucky left its clocks alone in 1974. 380# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 381Rule Louisville 1921 only - May 1 2:00 1:00 D 382Rule Louisville 1921 only - Sep 1 2:00 0 S 383Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 384Rule Louisville 1941 only - Sep lastSun 2:00 0 S 385Rule Louisville 1946 only - Jun 2 2:00 0 S 386Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 387Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 388# Zone NAME GMTOFF RULES FORMAT [UNTIL] 389Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 390 -6:00 US C%sT 1921 391 -6:00 Louisville C%sT 1942 392 -6:00 US C%sT 1946 393 -6:00 Louisville C%sT 1961 Jul 23 2:00 394 -5:00 - EST 1968 395 -5:00 US E%sT 1974 Jan 6 2:00 396 -6:00 1:00 CDT 1974 Oct 27 2:00 397 -5:00 US E%sT 398 399# Michigan 400# 401# From Bob Devine (1988-01-28): 402# Michigan didn't observe DST from 1968 to 1973. 403# 404# From Paul Eggert (1995-12-19): 405# Shanks writes that Michigan started using standard time on 1885 Sep 18, 406# but Howse (p 126) writes that Detroit kept 407# 408# local time until 1900 when the City Council decreed that clocks should 409# be put back twenty-eight minutes to Central Standard Time. Half the 410# city obeyed, half refused. After considerable debate, the decision 411# was rescinded and the city reverted to Sun time. A derisive offer to 412# erect a sundial in front of the city hall was referred to the 413# Committee on Sewers. Then, in 1905, Central time was adopted 414# by city vote. 415# 416# This story is too entertaining to be false, so go with Howse over Shanks. 417# 418# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 419# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 420Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 421Rule Detroit 1948 only - Sep lastSun 2:00 0 S 422Rule Detroit 1967 only - Jun 14 2:00 1:00 D 423Rule Detroit 1967 only - Oct lastSun 2:00 0 S 424# Zone NAME GMTOFF RULES FORMAT [UNTIL] 425Zone America/Detroit -5:32:11 - LMT 1905 426 -6:00 - CST 1915 May 15 2:00 427 -5:00 - EST 1942 428 -5:00 US E%sT 1946 429 -5:00 Detroit E%sT 1973 430 -5:00 US E%sT 1975 431 -5:00 - EST 1975 Apr 27 2:00 432 -5:00 US E%sT 433# 434# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 435# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 436Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 437Rule Menominee 1946 only - Sep lastSun 2:00 0 S 438Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 439Rule Menominee 1966 only - Oct lastSun 2:00 0 S 440# Zone NAME GMTOFF RULES FORMAT [UNTIL] 441Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 442 -6:00 US C%sT 1946 443 -6:00 Menominee C%sT 1969 Apr 27 2:00 444 -5:00 - EST 1973 Apr 29 2:00 445 -6:00 US C%sT 446 447# Navassa 448# uninhabited 449 450 451# Old names, for S5 users 452 453# Link LINK-FROM LINK-TO 454Link America/New_York EST5EDT 455Link America/Chicago CST6CDT 456Link America/Denver MST7MDT 457Link America/Los_Angeles PST8PDT 458Link America/Indianapolis EST 459Link America/Phoenix MST 460Link Pacific/Honolulu HST 461 462################################################################################ 463 464 465# From Paul Eggert <eggert@twinsun.com> (1996-11-22): 466# A good source for time zone historical data outside the US is 467# Thomas G. Shanks, The International Atlas (3rd edition), 468# San Diego: ACS Publications, Inc. (1991). 469# 470# Gwillim Law <LAW@encmail.encompass.com> writes that a good source 471# for recent time zone data is the International Air Transport 472# Association's Standard Schedules Information Manual (IATA SSIM), 473# published semiannually. Law sent in several helpful summaries 474# of the IATA's data after 1990. 475# 476# Except where otherwise noted, Shanks is the source for entries through 1990, 477# and IATA SSIM is the source for entries after 1990. 478# 479# Another source occasionally used is Edward W. Whitman, World Time Differences, 480# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 481# I found in the UCLA library. 482# 483# See the `europe' file for Greenland. 484# 485# See the `africa' file for time zone naming and abbreviation conventions. 486 487# Canada 488 489# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 490# I post here the time zone abbreviations standardized in Canada 491# for both English and French in the CAN/CSA-Z234.4-89 standard.... 492# 493# UTC Standard time Daylight savings time 494# offset French English French English 495# -2:30 - - HAT NDT 496# -3 - - HAA ADT 497# -3:30 HNT NST - - 498# -4 HNA AST HAE EDT 499# -5 HNE EST HAC CDT 500# -6 HNC CST HAR MDT 501# -7 HNR MST HAP PDT 502# -8 HNP PST HAY YDT 503# -9 HNY YST - - 504# 505# HN: Heure Normale ST: Standard Time 506# HA: Heure Avanc<e'>e DT: Daylight saving Time 507# 508# A: de l'Atlantique Atlantic 509# C: du Centre Central 510# E: de l'Est Eastern 511# M: Mountain 512# N: Newfoundland 513# P: du Pacifique Pacific 514# R: des Rocheuses 515# T: de Terre-Neuve 516# Y: du Yukon Yukon 517# 518# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 519# Alas, this sort of thing must be handled by localization software. 520 521# The data for Canada are all from Shanks (1991). 522 523 524# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 525Rule Canada 1918 only - Apr 14 2:00 1:00 D 526Rule Canada 1918 only - Oct 31 2:00 0 S 527Rule Canada 1942 only - Feb 9 2:00 1:00 D 528Rule Canada 1945 only - Sep 30 2:00 0 S 529Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 530Rule Canada 1974 max - Oct lastSun 2:00 0 S 531Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 532 533 534# Newfoundland (except Labrador) 535 536# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 537Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 538Rule StJohns 1917 only - Sep 17 2:00 0 S 539Rule StJohns 1918 only - Oct 31 2:00 0 S 540# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 541Rule StJohns 1919 only - May 5 23:00 1:00 D 542Rule StJohns 1919 only - Aug 12 23:00 0 S 543# For 1931-1935 Whitman gives Apr same date; go with Shanks. 544Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 545Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 546# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 547Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 548Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 549# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 550Rule StJohns 1942 only - Mar 1 0:00 1:00 D 551Rule StJohns 1942 only - Dec 31 0:00 0 S 552Rule StJohns 1943 only - May 30 0:00 1:00 D 553Rule StJohns 1943 only - Sep 5 0:00 0 S 554Rule StJohns 1944 only - Jul 10 0:00 1:00 D 555Rule StJohns 1944 only - Sep 2 0:00 0 S 556Rule StJohns 1945 only - Jan 1 0:00 1:00 D 557Rule StJohns 1945 only - Oct 7 2:00 0 S 558# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 559# Apr 30 - Sep 24; go with Shanks. 560Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 561Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 562Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 563Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 564Rule StJohns 1960 max - Oct lastSun 2:00 0 S 565Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D 566Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD 567Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D 568# St John's has an apostrophe, but Posix file names can't have apostrophes. 569# Zone NAME GMTOFF RULES FORMAT [UNTIL] 570Zone America/St_Johns -3:30:52 - LMT 1884 571 -3:30:52 StJohns N%sT 1935 Mar 30 572 -3:30 StJohns N%sT 573 574 575# east Labrador 576 577# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 578# Zone NAME GMTOFF RULES FORMAT [UNTIL] 579Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 580 -3:30:52 StJohns NST 1919 581 -3:30:52 - NST 1935 Mar 30 582 -3:30 - NST 1936 583 -3:30 StJohns N%sT 1966 Mar 15 2:00 584 -4:00 StJohns A%sT 585 586 587# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 588 589# From Paul Eggert (1996-06-12): 590# Shanks writes that since 1970 most of this region has been like Halifax. 591# Many locales did not observe peacetime DST until 1972; 592# Glace Bay, NS is the largest that we know of. 593# Shanks also writes that Liverpool, NS was the only town in Canada to observe 594# DST in 1971 but not 1970; for now we'll assume this is a typo. 595 596# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 597Rule Halifax 1916 only - Apr 1 0:00 1:00 D 598Rule Halifax 1916 only - Oct 1 0:00 0 S 599Rule Halifax 1918 only - Apr 14 2:00 1:00 D 600Rule Halifax 1918 only - Oct 31 2:00 0 S 601Rule Halifax 1920 only - May 9 0:00 1:00 D 602Rule Halifax 1920 only - Aug 29 0:00 0 S 603Rule Halifax 1921 only - May 6 0:00 1:00 D 604Rule Halifax 1921 1922 - Sep 5 0:00 0 S 605Rule Halifax 1922 only - Apr 30 0:00 1:00 D 606Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 607Rule Halifax 1923 only - Sep 4 0:00 0 S 608Rule Halifax 1924 only - Sep 15 0:00 0 S 609Rule Halifax 1925 only - Sep 28 0:00 0 S 610Rule Halifax 1926 only - May 16 0:00 1:00 D 611Rule Halifax 1926 only - Sep 13 0:00 0 S 612Rule Halifax 1927 only - May 1 0:00 1:00 D 613Rule Halifax 1927 only - Sep 26 0:00 0 S 614Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 615Rule Halifax 1928 only - Sep 9 0:00 0 S 616Rule Halifax 1929 only - Sep 3 0:00 0 S 617Rule Halifax 1930 only - Sep 15 0:00 0 S 618Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 619Rule Halifax 1933 only - Apr 30 0:00 1:00 D 620Rule Halifax 1933 only - Oct 2 0:00 0 S 621Rule Halifax 1934 only - May 20 0:00 1:00 D 622Rule Halifax 1934 only - Sep 16 0:00 0 S 623Rule Halifax 1935 only - Jun 2 0:00 1:00 D 624Rule Halifax 1935 only - Sep 30 0:00 0 S 625Rule Halifax 1936 only - Jun 1 0:00 1:00 D 626Rule Halifax 1936 only - Sep 14 0:00 0 S 627Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 628Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 629Rule Halifax 1939 only - May 28 0:00 1:00 D 630Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 631Rule Halifax 1942 only - Feb 9 2:00 1:00 D 632Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S 633Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 634Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 635Rule Halifax 1962 max - Oct lastSun 2:00 0 S 636Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 637# Zone NAME GMTOFF RULES FORMAT [UNTIL] 638Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 639 -4:00 Halifax A%sT 640Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 641 -4:00 Canada A%sT 1953 642 -4:00 Halifax A%sT 1954 643 -4:00 - AST 1972 644 -4:00 Halifax A%sT 645 646 647# Ontario, Quebec 648 649# From Paul Eggert (1996-06-12): 650# Shanks writes that since 1970 most of this region has been like Montreal. 651# Thunder Bay skipped DST in 1973. 652# Many smaller locales did not observe peacetime DST until 1974; 653# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 654# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 655 656# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 657Rule Mont 1917 only - Mar 25 2:00 1:00 D 658Rule Mont 1917 only - Apr 24 0:00 0 S 659Rule Mont 1918 only - Apr 14 2:00 1:00 D 660Rule Mont 1918 only - Oct 31 2:00 0 S 661Rule Mont 1919 only - Mar 31 2:30 1:00 D 662Rule Mont 1919 only - Oct 25 2:30 0 S 663Rule Mont 1920 only - May 2 2:30 1:00 D 664Rule Mont 1920 only - Oct 3 2:30 0 S 665Rule Mont 1921 only - May 1 2:00 1:00 D 666Rule Mont 1921 only - Oct 2 2:30 0 S 667Rule Mont 1922 only - Apr 30 2:00 1:00 D 668Rule Mont 1922 only - Oct 1 2:30 0 S 669Rule Mont 1924 only - May 17 2:00 1:00 D 670Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 671Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 672Rule Mont 1927 only - May 1 0:00 1:00 D 673Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 674Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 675Rule Mont 1932 only - May 1 0:00 1:00 D 676Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 677Rule Mont 1933 only - Oct 1 0:00 0 S 678Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 679Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 680Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 681Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 682Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 683Rule Mont 1957 max - Oct lastSun 2:00 0 S 684Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 685# Zone NAME GMTOFF RULES FORMAT [UNTIL] 686Zone America/Montreal -4:54:16 - LMT 1884 687 -5:00 Mont E%sT 688Zone America/Thunder_Bay -5:57:00 - LMT 1895 689 -5:00 Canada E%sT 1970 690 -5:00 Mont E%sT 1973 691 -5:00 - EST 1974 692 -5:00 Canada E%sT 693Zone America/Nipigon -5:53:04 - LMT 1895 694 -5:00 Canada E%sT 695Zone America/Rainy_River -6:17:56 - LMT 1895 696 -6:00 Canada C%sT 697 698 699# Manitoba 700 701# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 702Rule Winn 1916 only - Apr 23 0:00 1:00 D 703Rule Winn 1916 only - Sep 17 0:00 0 S 704Rule Winn 1918 only - Apr 14 2:00 1:00 D 705Rule Winn 1918 only - Oct 31 2:00 0 S 706Rule Winn 1937 only - May 16 2:00 1:00 D 707Rule Winn 1937 only - Sep 26 2:00 0 S 708Rule Winn 1942 only - Feb 9 2:00 1:00 D 709Rule Winn 1945 only - Sep lastSun 2:00 0 S 710Rule Winn 1946 only - May 12 2:00 1:00 D 711Rule Winn 1946 only - Oct 13 2:00 0 S 712Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 713Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 714Rule Winn 1950 only - May 1 2:00 1:00 D 715Rule Winn 1950 only - Sep 30 2:00 0 S 716Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 717Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 718Rule Winn 1959 only - Oct lastSun 2:00 0 S 719Rule Winn 1960 only - Sep lastSun 2:00 0 S 720Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 721Rule Winn 1963 only - Sep 22 2:00 0 S 722Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 723Rule Winn 1966 max - Oct lastSun 2:00 0 S 724Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 725# Zone NAME GMTOFF RULES FORMAT [UNTIL] 726Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 727 -6:00 Winn C%sT 728 729 730# Saskatchewan 731 732# From Paul Eggert (1996-06-12): 733# Shanks writes that since 1970 most of this region has been like Regina. 734# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 735# Other western towns (e.g. Lloydminster) are like Edmonton. 736 737# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 738# The. . .below is based on information I got from our law library, the 739# provincial archives, and the provincial Community Services department. 740# A precise history would require digging through newspaper archives, and 741# since you didn't say what you wanted, I didn't bother. 742# 743# Saskatchewan is split by a time zone meridian (105W) and over the years 744# the boundary became pretty ragged as communities near it reevaluated 745# their affiliations in one direction or the other. In 1965 a provincial 746# referendum favoured legislating common time practices. 747# 748# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 749# Saskatchewan 1978) was proclaimed, and established that the eastern 750# part of Saskatchewan would use CST year round, that districts in 751# northwest Saskatchewan would by default follow CST but could opt to 752# follow Mountain Time rules (thus 1 hour difference in the winter and 753# zero in the summer), and that districts in southwest Saskatchewan would 754# by default follow MT but could opt to follow CST. 755# 756# It took a few years for the dust to settle (I know one story of a town 757# on one time zone having its school in another, such that a mom had to 758# serve her family lunch in two shifts), but presently it seems that only 759# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 760# rules any more; all other districts appear to have used CST year round 761# since sometime in the 1960s. 762 763# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 764Rule Regina 1918 only - Apr 14 2:00 1:00 D 765Rule Regina 1918 only - Oct 31 2:00 0 S 766Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 767Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 768Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 769Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 770Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 771Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 772Rule Regina 1942 only - Feb 9 2:00 1:00 D 773Rule Regina 1945 only - Sep lastSun 2:00 0 S 774Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 775Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 776Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D 777Rule Regina 1947 1958 - Sep lastSun 2:00 0 S 778Rule Regina 1959 only - Oct lastSun 2:00 0 S 779# 780Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 781Rule Swift 1957 only - Oct lastSun 2:00 0 S 782Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 783Rule Swift 1959 only - Oct lastSun 2:00 0 S 784Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 785# Zone NAME GMTOFF RULES FORMAT [UNTIL] 786Zone America/Regina -6:58:36 - LMT 1905 Sep 787 -7:00 Regina M%sT 1960 Apr lastSun 2:00 788 -6:00 - CST 789Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 790 -7:00 Canada M%sT 1946 Apr lastSun 2:00 791 -7:00 Regina M%sT 1950 792 -7:00 Swift M%sT 1972 Apr lastSun 2:00 793 -6:00 - CST 794 795 796# Alberta 797 798# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 799Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 800Rule Edm 1918 only - Oct 31 2:00 0 S 801Rule Edm 1919 only - May 27 2:00 0 S 802Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 803Rule Edm 1920 only - Oct lastSun 2:00 0 S 804Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 805Rule Edm 1942 only - Feb 9 2:00 1:00 D 806Rule Edm 1945 only - Sep lastSun 2:00 0 S 807Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 808Rule Edm 1947 only - Sep lastSun 2:00 0 S 809Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 810Rule Edm 1967 only - Oct lastSun 2:00 0 S 811Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 812Rule Edm 1969 only - Oct lastSun 2:00 0 S 813Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 814Rule Edm 1972 max - Oct lastSun 2:00 0 S 815Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 816# Zone NAME GMTOFF RULES FORMAT [UNTIL] 817Zone America/Edmonton -7:33:52 - LMT 1906 Sep 818 -7:00 Edm M%sT 819 820 821# British Columbia 822 823# From Paul Eggert (1996-06-12): 824# Shanks writes that since 1970 most of this region has been like Vancouver. 825# Dawswon Creek uses MST. Much of east BC is like Edmonton. 826 827# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 828Rule Vanc 1918 only - Apr 14 2:00 1:00 D 829Rule Vanc 1918 only - Oct 31 2:00 0 S 830Rule Vanc 1942 only - Feb 9 2:00 1:00 D 831Rule Vanc 1945 only - Sep 30 2:00 0 S 832Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 833Rule Vanc 1946 only - Oct 13 2:00 0 S 834Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 835Rule Vanc 1962 max - Oct lastSun 2:00 0 S 836Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 837# Zone NAME GMTOFF RULES FORMAT [UNTIL] 838Zone America/Vancouver -8:12:28 - LMT 1884 839 -8:00 Vanc P%sT 840Zone America/Dawson_Creek -8:00:56 - LMT 1884 841 -8:00 Canada P%sT 1947 842 -8:00 Vanc P%sT 1972 Aug 30 2:00 843 -7:00 - MST 844 845 846# Northwest Territories, Yukon 847 848# From Paul Eggert (1996-10-07): 849# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 850# Shanks's table for Watson Lake is corrupted, so we have no data there. 851# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 852# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 853# c. 7 defines Yukon standard time as UTC-9. This is still valid; 854# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 855# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 856# * O.I.C. 1980/02 established DST. 857# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 858# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 859 860# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 861Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 862Rule NT_YK 1918 only - Oct 27 2:00 0 S 863Rule NT_YK 1919 only - May 25 2:00 1:00 D 864Rule NT_YK 1919 only - Nov 1 0:00 0 S 865Rule NT_YK 1942 only - Feb 9 2:00 1:00 D 866Rule NT_YK 1945 only - Sep 30 2:00 0 S 867Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 868Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 869Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 870Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 871Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 872# Zone NAME GMTOFF RULES FORMAT [UNTIL] 873Zone America/Pangnirtung -4:22:56 - LMT 1884 874 -4:00 NT_YK A%sT 875Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay 876 -5:00 NT_YK E%sT 877Zone America/Rankin_Inlet -6:08:40 - LMT 1884 878 -6:00 NT_YK C%sT 879Zone America/Yellowknife -7:37:24 - LMT 1884 880 -7:00 NT_YK M%sT 881Zone America/Inuvik -8:54:00 - LMT 1884 882 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 883 -7:00 NT_YK M%sT 884Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 885 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 886 -8:00 NT_YK P%sT 887Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 888 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 889 -8:00 NT_YK P%sT 890 891 892############################################################################### 893 894# Mexico 895 896# From Guy Harris: 897# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 898# Rules prior to 1987 are unknown. 899# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 900# observe DST." This is presumably Baja California Norte, above 28th parallel, 901# as listed there; [there is also] "Baja California Sur and N. Pacific 902# Coast (States of Sinaloa and Sonora)." 903 904# From Bob Devine (1988-01-28): 905# The Federal District (where Mexico City is) has observed [DST] several 906# times but not recently. 907# 908# I don't where to drawn the line in the North Baja area. 28th latitude 909# sounds good -- but it may be higher (how far [d]o radio stations from 910# San Diego affect culture?). 911# 912# The dates of DST probably go back to 1981. The rules are the same as 913# US's. This is going to be a headache for US presidential electi[o]n years! 914 915# From Arthur David Olson (1988-02-13) 916# Since the 1981 starting date is only "probable," we'll keep the 1987 917# starting date below. 918 919# From U. S. Naval Observatory (1989-01-19): 920# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 921# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 922# MEXICO BAJA CAL N OF SINALOA AND SONORA) 923# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 924# MEXICO BAJA CAL N - OCT 29 925# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 926# MEXICO BAJA CAL N - 0CT 29 927# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 928# MEXICO COAHUILA, NUEVO LEON, 929# MEXICO TAMAULIPAS 930# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 931# MEXICO COAHUILA, NUEVO LEON, 932# MEXICO TAMAULIPAS APR 3 - OCT 29 933# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 934# MEXICO CAMPECHE, QUINTANA ROO AND 935# MEXICO YUCATAN 936 937# From Arthur David Olson (1989-01-21): 938# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 939# USNO claims there should be four Mexican zones rather than three: 940# a zone that's GMT-8 with DST; a zone that's always GMT-7; 941# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 942 943# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 944# Shanks also says there are four zones, but disagrees about the fourth. 945# Instead of GMT-6 with DST, he says there's GMT-8 without DST. 946 947# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 948# A guy from our Mexico subsidiary finally found the Presidential Decree 949# outlining the timezone changes in Mexico. 950# 951# ------------- Begin Forwarded Message ------------- 952# 953# I finally got my hands on the Official Presidential Decree that sets up the 954# rules for the DST changes. The rules are: 955# 956# 1. The country is divided in 3 timezones: 957# - Baja California Norte (the Mexico/BajaNorte TZ) 958# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 959# - The rest of the country (the Mexico/General TZ) 960# 961# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 962# at 2:00 AM, the times in each zone are as follows: 963# BajaNorte: GMT+7 964# BajaSur: GMT+6 965# General: GMT+5 966# 967# 3. The rest of the year, the times are as follows: 968# BajaNorte: GMT+8 969# BajaSur: GMT+7 970# General: GMT+6 971# 972# The Decree was published in Mexico's Official Newspaper on January 4th. 973# 974# -------------- End Forwarded Message -------------- 975# From Paul Eggert (1996-06-12): 976# For an English translation of the decree, 977# see ``Diario Oficial: Time Zone Changeover'', 978# <URL:http://mexico-travel.com/extra/timezone_eng.html> (1996-01-04). 979 980# From Shanks (1991): 981# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 982Rule Mexico 1939 only - Feb 5 0:00 1:00 D 983Rule Mexico 1939 only - Jun 25 0:00 0 S 984Rule Mexico 1940 only - Dec 9 0:00 1:00 D 985Rule Mexico 1941 only - Apr 1 0:00 0 S 986Rule Mexico 1943 only - Dec 16 0:00 1:00 D 987Rule Mexico 1944 only - May 1 0:00 0 S 988Rule Mexico 1950 only - Feb 12 0:00 1:00 D 989Rule Mexico 1950 only - Jul 30 0:00 0 S 990Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D 991Rule Mexico 1996 max - Oct lastSun 2:00 0 S 992# 993Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D 994Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S 995Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S 996# Zone NAME GMTOFF RULES FORMAT [UNTIL] 997Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 998 -7:00 - MST 1927 Jun 10 23:00 999 -6:00 - CST 1930 Nov 15 1000 -7:00 - MST 1931 May 1 23:00 1001 -6:00 - CST 1931 Oct 1002 -7:00 - MST 1932 Mar 30 23:00 1003 -6:00 Mexico C%sT 1004Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1005 -7:00 - MST 1927 Jun 10 23:00 1006 -6:00 - CST 1930 Nov 15 1007 -7:00 - MST 1931 May 1 23:00 1008 -6:00 - CST 1931 Oct 1009 -7:00 - MST 1932 Mar 30 23:00 1010 -6:00 - CST 1942 Apr 1011 -7:00 - MST 1949 Jan 14 1012 -8:00 - PST 1970 1013 -7:00 Mexico M%sT 1014Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1015 -8:00 - PST 1927 Jun 10 23:00 1016 -7:00 - MST 1930 Nov 16 1017 -8:00 - PST 1942 Apr 1018 -7:00 - MST 1949 Jan 14 1019 -8:00 BajaN P%sT 1967 Apr lastSun 2:00 1020 -8:00 US P%sT 1996 1021 -8:00 Mexico P%sT 1022Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32 1023 -8:00 - PST 1927 Jun 10 23:00 1024 -7:00 - MST 1930 Nov 16 1025 -8:00 - PST 1942 Apr 1026 -7:00 - MST 1949 Jan 14 1027 -8:00 - PST 1996 1028 -8:00 Mexico P%sT 1029# 1030# Revillagigedo Is 1031# no information 1032 1033############################################################################### 1034 1035# Anguilla 1036# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1037Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1038 -4:00 - AST 1039 1040# Antigua and Barbuda 1041# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1042Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1043 -5:00 - EST 1951 1044 -4:00 - AST 1045 1046# Bahamas 1047# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1048Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1049Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1050Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1051# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1052Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1053 -5:00 Bahamas E%sT 1054 1055# Barbados 1056# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1057Rule Barb 1977 only - Jun 12 2:00 1:00 D 1058Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1059Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1060Rule Barb 1979 only - Sep 30 2:00 0 S 1061Rule Barb 1980 only - Sep 25 2:00 0 S 1062# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1063Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1064 -3:58 - BMT 1932 # Bridgetown Mean Time 1065 -4:00 Barb A%sT 1066 1067# Belize 1068# Whitman entirely disagrees with Shanks; go with Shanks. 1069# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1070Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1071Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1072Rule Belize 1973 only - Dec 5 0:00 1:00 D 1073Rule Belize 1974 only - Feb 9 0:00 0 S 1074Rule Belize 1982 only - Dec 18 0:00 1:00 D 1075Rule Belize 1983 only - Feb 12 0:00 0 S 1076# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1077Zone America/Belize -5:52:48 - LMT 1912 Apr 1078 -6:00 Belize C%sT 1079 1080# Bermuda 1081# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1082Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1083 -4:00 - AST 1974 Apr 28 2:00 1084 -4:00 Bahamas A%sT 1085 1086# Cayman Is 1087# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1088Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1089 -5:07 - KMT 1912 Feb # Kingston Mean Time 1090 -5:00 - EST 1091 1092# Clipperton 1093# uninhabited 1094 1095# Costa Rica 1096# Shanks gives some very odd dates for 1991, and stops there. 1097# For now, we won't guess further. 1098# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1099Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1100Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1101Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1102# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1103Rule CR 1991 only - Jul 1 0:00 0 S 1104Rule CR 1992 only - Mar 15 0:00 0 S 1105# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1106# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1107Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1108 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time 1109 -6:00 CR C%sT 1110# Coco 1111# no information; probably like America/Costa_Rica 1112 1113# Cuba 1114 1115# From Bob Devine (1988-01-28): 1116# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 1117# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 1118# (I think). 1119 1120# From U. S. Naval Observatory (1989-01-19): 1121# CUBA 5 H BEHIND UTC 1122# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 1123 1124# From Shanks (1991): 1125# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1126Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1127Rule Cuba 1928 only - Oct 10 0:00 0 S 1128Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1129Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1130Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1131Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1132Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1133Rule Cuba 1965 only - Sep 30 0:00 0 S 1134Rule Cuba 1966 only - May 29 0:00 1:00 D 1135Rule Cuba 1966 only - Oct 2 0:00 0 S 1136Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1137Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1138Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1139Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1140Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1141Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1142Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1143Rule Cuba 1978 only - May 7 0:00 1:00 D 1144Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S 1145Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1146Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1147Rule Cuba 1981 1990 - Oct Sun>=8 0:00 0 S 1148Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1149Rule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D 1150Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1151Rule Cuba 1996 max - Oct Sun>=1 0:00s 0 S 1152 1153# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1154Zone America/Havana -5:29:28 - LMT 1890 1155 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT 1156 -5:00 Cuba C%sT 1157 1158# Dominica 1159# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1160Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1161 -4:00 - AST 1162 1163# Dominican Republic 1164# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1165Rule DR 1966 only - Oct 30 0:00 1:00 D 1166Rule DR 1967 only - Feb 28 0:00 0 S 1167Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1168Rule DR 1970 only - Feb 21 0:00 0 S 1169Rule DR 1971 only - Jan 20 0:00 0 S 1170Rule DR 1972 1974 - Jan 21 0:00 0 S 1171# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1172Zone America/Santo_Domingo -4:39:36 - LMT 1890 1173 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1174 -5:00 DR E%sT 1974 Oct 27 1175 -4:00 - AST 1176 1177# El Salvador 1178# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1179Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1180Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1181# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 1182# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1183Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1184 -6:00 Salv C%sT 1185 1186# Grenada 1187# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1188Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1189 -4:00 - AST 1190 1191# Guadeloupe 1192# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1193Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1194 -4:00 - AST 1195 1196# Guatemala 1197# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1198Rule Guat 1973 only - Nov 25 0:00 1:00 D 1199Rule Guat 1974 only - Feb 24 0:00 0 S 1200Rule Guat 1983 only - May 21 0:00 1:00 D 1201Rule Guat 1983 only - Sep 22 0:00 0 S 1202Rule Guat 1991 only - Mar 23 0:00 1:00 D 1203Rule Guat 1991 only - Sep 7 0:00 0 S 1204# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1205Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1206 -6:00 Guat C%sT 1207 1208# Haiti 1209# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1210Rule Haiti 1983 only - May 8 0:00 1:00 D 1211Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1212Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1213# Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA. 1214Rule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D 1215Rule Haiti 1988 max - Oct lastSun 1:00s 0 S 1216# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1217Zone America/Port-au-Prince -4:49:20 - LMT 1890 1218 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1219 -5:00 Haiti E%sT 1220 1221# Honduras 1222# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1223# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1224Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1225 -6:00 Salv C%sT 1226 1227# Jamaica 1228 1229# From Bob Devine (1988-01-28): 1230# Follows US rules. 1231 1232# From U. S. Naval Observatory (1989-01-19): 1233# JAMAICA 5 H BEHIND UTC 1234 1235# From Shanks (1991): 1236# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1237Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1238 -5:07 - KMT 1912 Feb # Kingston Mean Time 1239 -5:00 - EST 1974 Jan 6 2:00 1240 -5:00 US E%sT 1984 1241 -5:00 - EST 1242 1243# Martinique 1244# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1245Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1246 -4:04 - FFMT 1911 May # Fort-de-France MT 1247 -4:00 - AST 1980 Apr 6 1248 -4:00 1:00 ADT 1980 Sep 28 1249 -4:00 - AST 1250 1251# Montserrat 1252# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1253Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth 1254 -4:00 - AST 1255 1256# Nicaragua 1257# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1258Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 1259Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 1260Rule Nic 1992 only - Jan 1 4:00 1:00 D 1261Rule Nic 1992 only - Sep 24 0:00 0 S 1262# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1263Zone America/Managua -5:45:08 - LMT 1890 1264 -5:45 - MMT 1934 Jun 23 # Managua Mean Time 1265 -6:00 - CST 1973 May 1266 -5:00 - EST 1975 Feb 16 1267 -6:00 Nic C%sT 1993 Jan 1 4:00 1268 -5:00 - EST 1269 1270# Panama 1271# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1272Zone America/Panama -5:18:08 - LMT 1890 1273 -5:20 - PMT 1908 Apr 22 # Panama Mean Time 1274 -5:00 - EST 1275 1276# Puerto Rico 1277# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 1278# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1279Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 1280 -4:00 - AST 1942 May 3 1281 -4:00 1:00 AWT 1945 Sep 30 2:00 1282 -4:00 - AST 1283 1284# St Kitts-Nevis 1285# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1286Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 1287 -4:00 - AST 1288 1289# St Lucia 1290# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1291Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 1292 -4:04 - CMT 1912 # Castries Mean Time 1293 -4:00 - AST 1294 1295# St Pierre and Miquelon 1296# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 1297# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1298Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 1299 -4:00 - AST 1980 May 1300 -3:00 Mont PM%sT # Pierre & Miquelon Time 1301 1302# St Vincent and the Grenadines 1303# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1304Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1305 -4:05 - KMT 1912 # Kingstown Mean Time 1306 -4:00 - AST 1307 1308# Turks and Caicos 1309# From Paul Eggert (1996-11-22): 1310# Shanks says they use US DST rules, but IATA SSIM (1991/1996) 1311# says they switch at midnight. Go with IATA SSIM. 1312# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1313Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 1314Rule TC 1979 max - Oct lastSun 0:00 0 S 1315Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 1316# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1317Zone America/Grand_Turk -4:44:32 - LMT 1890 1318 -5:07 - KMT 1912 Feb # Kingston Mean Time 1319 -5:00 TC E%sT 1320 1321# British Virgin Is 1322# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1323Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 1324 -4:00 - AST 1325 1326# Virgin Is 1327# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1328Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1329 -4:00 - AST 1330