1# @(#)northamerica 4.8 2 3############################################################################### 4 5# United States 6 7# From Arthur David Olson: 8# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 9# See, for example, the front page of the Saturday, October 26, 1974 10# and Sunday, October 27, 1974 editions of the Washington Post. 11 12# From seismo!munnari!kre: 13# I recall also being told by someone once that Canada didn't have 14# the DST variations in 74/75 that the US did, but I am not nearly 15# sure enough of this to add anything. 16 17# From Arthur David Olson: 18# The above has been confirmed by Bob Devine; we'll go with it here. 19 20# From Arthur David Olson: 21# Before the Uniform Time Act of 1966 took effect in 1967, observance of 22# Daylight Saving Time in the US was by local option, except during wartime. 23 24# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 25Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 26Rule US 1918 1919 - Oct lastSun 2:00 0 S 27Rule US 1942 only - Feb 9 2:00 1:00 W # War 28Rule US 1945 only - Sep 30 2:00 0 S 29Rule US 1967 max - Oct lastSun 2:00 0 S 30Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 31Rule US 1974 only - Jan 6 2:00 1:00 D 32Rule US 1975 only - Feb 23 2:00 1:00 D 33Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 34Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 35 36# From Bob Devine (January 28, 1988): 37# ...Alaska (and Hawaii) had the timezone names changed in 1967. 38# old new 39# Pacific Standard Time(PST) -same- 40# Yukon Standard Time(YST) -same- 41# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 42# Nome Standard Time (NT) Bering Standard Time (BST) 43# 44# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 45# The YST zone now covers nearly all of the state, AHST just part 46# of the Aleutian islands. No DST. 47 48# From U. S. Naval Observatory (January 19, 1989): 49# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 50# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 51# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 52# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 53# USA MOUNTAIN 7 H BEHIND UTC DENVER 54# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 55# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 56# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 57# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 58# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 59# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 60# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 61# USA HAWAII 10 H BEHIND UTC 62# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 63 64# From Arthur David Olson (January 21, 1989): 65# The above dates are for 1988. 66# Note the "AKST" and "AKDT" abbreviations, the claim that there's 67# no DST in Samoa, and the claim that there is DST in Alaska and the 68# Aleutians. 69 70# From Arthur David Olson (February 13, 1988): 71# Legal standard time zone names, from United States Code (1982 Edition and 72# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 73# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 74# took effect), as explained in sections 263 and 261: 75# (none) 76# United States standard eastern time 77# United States standard mountain time 78# United States standard central time 79# United States standard Pacific time 80# (none) 81# United States standard Alaska time 82# (none) 83# Next, names from April 1, 1967 until November 30, 1983 (the date for 84# public law 98-181): 85# Atlantic standard time 86# eastern standard time 87# central standard time 88# mountain standard time 89# Pacific standard time 90# Yukon standard time 91# Alaska-Hawaii standard time 92# Bering standard time 93# And after November 30, 1983: 94# Atlantic standard time 95# eastern standard time 96# central standard time 97# mountain standard time 98# Pacific standard time 99# Alaska standard time 100# Hawaii-Aleutian standard time 101# Samoa standard time 102# The law doesn't give abbreviations. 103 104# Easy stuff first--including Alaska, where we ignore history (since we 105# can't tell if we should give Yukon time or Alaska-Hawaii time for "old" 106# times). 107 108# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] 109Zone US/Eastern -5:00 US E%sT 110Zone US/Central -6:00 US C%sT 111Zone US/Mountain -7:00 US M%sT 112Zone US/Pacific -8:00 US P%sT 113Zone US/Alaska -9:00 US AK%sT # Abbreviation per USNO 114 115# Mainland US areas that are always Standard as of 1986. 116 117Zone US/East-Indiana -5:00 US E%sT 1946 118 -5:00 - EST # Always EST as of 1986 119Zone US/Arizona -7:00 US M%sT 1946 120 -7:00 - MST # Always MST as of 1986 121 122# From Arthur David Olson (February 13, 1988): 123# However. . .a writer from the Inter Tribal Council of Arizona, Inc., 124# notes in private correspondence dated 12/28/87 that "Presently, only the 125# Navajo Nation participates in the Daylight Saving Time policy, due to its 126# large size and location in three states." (The "only" means that other 127# tribal nations don't use DST.) 128 129Link US/Mountain Navajo 130 131# From Bob Devine (January 28, 1988): 132# Michigan didn't observe DST from 1968 to 1973. 133 134Zone US/Michigan -5:00 US E%sT 1968 135 -5:00 - EST 1973 136 -5:00 US E%sT 137 138# Samoa just changes names. No DST, per Naval Observatory. 139 140Zone US/Samoa -11:00 - NST 1967 Apr 1 # N=Nome 141 -11:00 - BST 1983 Nov 30 # B=Bering 142 -11:00 - SST # S=Samoa 143 144# Aleutian has a name change. DST, per Naval Observatory. 145 146Zone US/Aleutian -10:00 US AH%sT 1983 Nov 30 147 -10:00 US HA%sT 148 149# From Arthur David Olson: 150# And then there's Hawaii. 151# DST was observed for one day in 1933; 152# Standard time was change by half an hour in 1947; 153# it's always standard as of 1986. 154 155Zone US/Hawaii -10:30 US H%sT 1933 Apr 30 2:00 156 -10:30 1:00 HDT 1933 May 1 2:00 157 -10:30 US H%sT 1947 Jun 8 2:00 158 -10:00 - HST 159 160# Old names, for S5 users 161 162# Link LINK-FROM LINK-TO 163# Link US/Eastern EST5EDT 164# Link US/Central CST6CDT 165# Link US/Mountain MST7MDT 166# Link US/Pacific PST8PDT 167# Link US/East-Indiana EST 168# Link US/Arizona MST 169# Link US/Hawaii HST 170 171################################################################################ 172 173# Canada 174 175# Canada is reportedly lots easier than the US--leastways since 1951. 176# I don't know what they did before then. 177# 4.3BSD claims that it's perfectly regular. 178# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc. 179# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada, 180# "...Canada (well, Ontario and at least some of the other provinces) are 181# adopting the new daylight savings time rules...". We assume all of 182# Canada is doing so. 183 184# From Bob Devine (January 28, 1988): 185# All of Canada did have DST from your first rule except Saskatchewan. 186# Which parts did not observe DST is hard to pinpoint but most of the 187# province follows the rules. 188# NOTE: those that didn't have DST for that rule, also 189# probably did not have it for several years previous. 190 191# From U. S. Naval Observatory (January 19, 1989): 192# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S 193# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29 194# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX 195# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29 196# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA 197# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29 198# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG 199# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29 200# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON 201# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29 202# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER 203# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29 204# CANADA YUKON SAME AS PACIFIC DAWSON 205 206# From Arthur David Olson (January 21, 1989): 207# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 208# Note claim that there's double DST in Newfoundland and that Yukon should 209# be same as Pacific. Stick with rules posted in 1988 until more authoritative 210# information is available. 211 212# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 213Rule Canada 1969 max - Oct lastSun 2:00 0 S 214Rule Canada 1969 1986 - Apr lastSun 2:00 1:00 D 215Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 216 217# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] 218# Bob Devine says that DST *is* observed in Newfoundland 219Zone Canada/Newfoundland -3:30 Canada N%sT 220Zone Canada/Atlantic -4:00 Canada A%sT 221Zone Canada/Eastern -5:00 Canada E%sT 222Zone Canada/Central -6:00 Canada C%sT 223Zone Canada/East-Saskatchewan -6:00 - CST # No DST as of 1987 224Zone Canada/Mountain -7:00 Canada M%sT 225Zone Canada/Pacific -8:00 Canada P%sT 226Zone Canada/Yukon -9:00 Canada Y%sT 227 228############################################################################### 229 230# Mexico 231 232# From Guy Harris: 233# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. 234# Rules prior to 1987 are unknown. 235# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana 236# observe DST." This is presumably Baja California Norte, above 28th parallel, 237# as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific 238# Coast (States of Sinaloa and Sonora)." 239 240# From Bob Devine (January 28, 1988): 241# The Federal District (where Mexico City is) has observed [DST] several 242# times but not recently. 243# 244# I don't where to drawn the line in the North Baja area. 28th latitude 245# sounds good -- but it may be higher (how far [d]o radio stations from 246# San Diego affect culture?). 247# 248# The dates of DST probably go back to 1981. The rules are the same as 249# US's. This is going to be a headache for US presidential electi[o]n years! 250 251# From Arthur David Olson (February 13, 1988) 252# Since the 1981 starting date is only "probable," we'll keep the 1987 253# starting date below. 254 255# From U. S. Naval Observatory (January 19, 1989): 256# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND 257# MEXICO BAJA CAL N N. PACIFIC COAST (STATES 258# MEXICO BAJA CAL N OF SINALOA AND SONORA) 259# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 260# MEXICO BAJA CAL N - OCT 29 261# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3 262# MEXICO BAJA CAL N - 0CT 29 263# MEXICO 6 H BEHIND UTC STATES OF DURANGO, 264# MEXICO COAHUILA, NUEVO LEON, 265# MEXICO TAMAULIPAS 266# MEXICO 5 H BEHIND UTC STATES OF DURANGO, 267# MEXICO COAHUILA, NUEVO LEON, 268# MEXICO TAMAULIPAS APR 3 - OCT 29 269# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF 270# MEXICO CAMPECHE, QUINTANA ROO AND 271# MEXICO YUCATAN 272 273# From Arthur David Olson (January 21, 1989): 274# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. 275# USNO claims there should be four Mexican zones rather than three: 276# a zone that's GMT-8 with DST; a zone that's always GMT-7; 277# a zone that's GMT-6 with DST; and a zone that's always GMT-6. 278# Wait for more authoritative information before changing. 279 280# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 281Rule Mexico 1987 max - Oct lastSun 2:00 0 S 282Rule Mexico 1987 max - Apr Sun>=1 2:00 1:00 D 283 284# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] 285Zone Mexico/BajaNorte -8:00 Mexico P%sT 286Zone Mexico/BajaSur -7:00 - MST 287Zone Mexico/General -6:00 - CST 288 289############################################################################### 290 291# Jamaica 292 293# From Bob Devine (January 28, 1988): 294# Follows US rules. 295 296# From U. S. Naval Observatory (January 19, 1989): 297# JAMAICA 5 H BEHIND UTC 298 299Link US/Eastern Jamaica 300 301############################################################################### 302 303# Cuba 304 305# From Bob Devine (January 28, 1988): 306# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. 307# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March 308# (I think). 309 310# From U. S. Naval Observatory (January 19, 1989): 311# CUBA 5 H BEHIND UTC 312# CUBA 4 H BEHIND UTC MAR 20 - OCT 8 313 314# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 315Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 316Rule Cuba 1979 1980 - Oct Sun>=8 0:00 0 S 317Rule Cuba 1981 max - May Sun>=8 0:00 1:00 D 318Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S 319 320# Zone NAME GMTOFF RULES/SAVE FORMAT 321Zone Cuba -5:00 Cuba C%sT 322