diff --git a/northamerica b/northamerica index 0922c57..c880fb7 100644 --- a/northamerica +++ b/northamerica @@ -1,16 +1,24 @@ # %W% +############################################################################### + +# United States + +# From Arthur David Olson: # US Daylight Saving Time ended on the last Sunday of *October* in 1974. # See, for example, the front page of the Saturday, October 26, 1974 # and Sunday, October 27, 1974 editions of the Washington Post. -# Note also this from seismo!munnari!kre: -# "I recall also being told by someone once that Canada didn't have +# From seismo!munnari!kre: +# I recall also being told by someone once that Canada didn't have # the DST variations in 74/75 that the US did, but I am not nearly -# sure enough of this to add anything." +# sure enough of this to add anything. + +# From Arthur David Olson: # The above has been confirmed by Bob Devine; we'll go with it here. -# Before the Uniform Time Act of 1966 took effect in 1967, observance of +# From Arthur David Olson: +# Before the Uniform Time Act of 1966 took effect in 1966, observance of # Daylight Saving Time in the US was by local option, except during wartime. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S @@ -25,16 +33,84 @@ Rule US 1975 only - Feb 23 2:00 1:00 D Rule US 1976 1986 - Apr lastSun 2:00 1:00 D Rule US 1987 max - Apr Sun>=1 2:00 1:00 D -############################################################################### +# From Bob Devine (January 28, 1988): +# ...Alaska (and Hawaii) had the timezone names changed in 1967. +# old new +# Pacific Standard Time(PST) -same- +# Yukon Standard Time(YST) -same- +# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) +# Nome Standard Time (NT) Bering Standard Time (BST) +# +# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. +# The YST zone now covers nearly all of the state, AHST just part +# of the Aleutian islands. No DST. -# New names +# From U.S. Naval Observatory (February 13, 1988): +# USA EASTERN 5 H BEHIND UTC IN WINTER; NEW YORK, WASHINGTON +# USA EASTERN 4 H BEHIND UTC APR 29 - OCT 29 +# USA CENTRAL 6 H BEHIND UTC IN WINTER; CHICAGO, HOUSTON +# USA CENTRAL 5 H BEHIND UTC APR 29 - OCT 29 +# USA MOUNTAIN 7 H BEHIND UTC IN WINTER; DENVER +# USA MOUNTAIN 6 H BEHIND UTC APR 29 - OCT 29 +# USA PACIFIC 8 H BEHIND UTC IN WINTER; L.A., SAN FRANCISCO +# USA PACIFIC 7 H BEHIND UTC APR 29 - OCT 29 +# USA ALASKA STD 9 H BEHIND UTC IN WINTER; MOST OF ALASKA (AKST) +# USA ALASKA STD 8 H BEHIND UTC APR 29 - OCT 29 (AKDT) +# USA ALEUTIAN 10 H BEHIND UTC IN WINTER; ISLANDS WEST OF 170W +# USA - " - 9 H BEHIND UTC APR 29 - OCT 29 +# USA HAWAII 10 H BEHIND UTC ALL YEAR; +# USA BERING 11 H BEHIND UTC ALL YEAR; SAMOA, MIDWAY -# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] +# From Arthur David Olson (February 13, 1988): +# Note that the Naval Observatory has the wrong starting date for DST. +# Note also the "AKST" and "AKDT" abbreviations, the claim that there's +# no DST in Samoa, and the claim that there is DST in Alaska and the +# Aleutians. + +# From Arthur David Olson (February 13, 1988): +# Legal standard time zone names, from United States Code (1982 Edition and +# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names +# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966 +# took effect), as explained in sections 263 and 261: +# (none) +# United States standard eastern time +# United States standard mountain time +# United States standard central time +# United States standard Pacific time +# (none) +# United States standard Alaska time +# (none) +# Next, names from April 1, 1967 until November 30, 1983 (the date for +# public law 98-181): +# Atlantic standard time +# eastern standard time +# central standard time +# mountain standard time +# Pacific standard time +# Yukon standard time +# Alaska-Hawaii standard time +# Bering standard time +# And after November 30, 1983: +# Atlantic standard time +# eastern standard time +# central standard time +# mountain standard time +# Pacific standard time +# Alaska standard time +# Hawaii-Aleutian standard time +# Samoa standard time +# The law doesn't give abbreviations. + +# Easy stuff first--including Alaska, where we ignore history (since we +# can't tell if we should give Yukon time or Alaska-Hawaii time for "old" +# times). + +# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] Zone US/Eastern -5:00 US E%sT Zone US/Central -6:00 US C%sT Zone US/Mountain -7:00 US M%sT Zone US/Pacific -8:00 US P%sT -Zone US/Yukon -9:00 US Y%sT +Zone US/Alaska -9:00 US AK%sT # Per Naval Observatory # Mainland US areas that are always Standard as of 1986. @@ -43,19 +119,34 @@ Zone US/East-Indiana -5:00 US E%sT 1946 Zone US/Arizona -7:00 US M%sT 1946 -7:00 - MST # Always MST as of 1986 +# From Arthur David Olson (February 13, 1988): # However. . .a writer from the Inter Tribal Council of Arizona, Inc., # notes in private correspondence dated 12/28/87 that "Presently, only the # Navajo Nation participates in the Daylight Saving Time policy, due to its -# large size and location in three states." +# large size and location in three states." (The "only" means that other +# tribal nations don't use DST.) Link US/Mountain Navajo -# Bob Devine notes that "Michigan didn't observe DST from 1968 to 1973." +# From Bob Devine (January 28, 1988): +# Michigan didn't observe DST from 1968 to 1973. Zone US/Michigan -5:00 US E%sT 1968 -5:00 - EST 1973 -5:00 US E%sT +# Samoa just changes names. No DST, as per Naval Observatory. + +Zone US/Samoa -11:00 - NST 1967 Apr 1 # N=Nome + -11:00 - BST 1983 Nov 30 # B=Bering + -11:00 - SST + +# Aleutian has a name change. DST, as per Naval Observatory. + +Zone US/Aleutian -10:00 US AH%sT 1983 Nov 30 + -10:00 US HAST + +# From Arthur David Olson: # And then there's Hawaii. # DST was observed for one day in 1933; # Standard time was change by half an hour in 1947; @@ -77,20 +168,10 @@ Link US/East-Indiana EST Link US/Arizona MST Link US/Hawaii HST -# From Bob Devine (January 28, 1988): -# ...Alaska (and Hawaii) had the timezone names changed in 1967. -# old new -# Pacific Standard Time(PST) -same- -# Yukon Standard Time(YST) -same- -# Central Alaska S.T. (CAT) Alaska-Hawaii Stnadard Time (AHST) -# Nome Standard Time (NT) Bering Standard Time (BST) -# -# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. -# The YST zone now covers nearly all of the state, AHST just part -# of the Aleutian islands. No DST. - ################################################################################ +# Canada + # Canada is reportedly lots easier than the US--leastways since 1951. # I don't know what they did before then. # 4.3BSD claims that it's perfectly regular. @@ -100,9 +181,10 @@ Link US/Hawaii HST # adopting the new daylight savings time rules...". We assume all of # Canada is doing so. -# From Bob Devine (January 28, 1988): "All of Canada did have DST from your -# first rule except Saskatchewan. Which parts did not observe DST is hard -# to pinpoint but most of the province follows the rules. +# From Bob Devine (January 28, 1988): +# All of Canada did have DST from your first rule except Saskatchewan. +# Which parts did not observe DST is hard to pinpoint but most of the +# province follows the rules. # NOTE: those that didn't have DST for that rule, also # probably did not have it for several years previous. @@ -134,20 +216,29 @@ Zone Canada/Yukon -9:00 Canada Y%sT # as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific # Coast (States of Sinaloa and Sonora)." -# From Bob Devine: +# From Bob Devine (January 28, 1988): # The Federal District (where Mexico City is) has observed [DST] several # times but not recently. # # I don't where to drawn the line in the North Baja area. 28th latitude -# sounds good -- but it may be higher (how far to radio stations from +# sounds good -- but it may be higher (how far [d]o radio stations from # San Diego affect culture?). # # The dates of DST probably go back to 1981. The rules are the same as # US's. This is going to be a headache for US presidential electi[o]n years! -# From Arthur David Olson: +# From Arthur David Olson (February 13, 1988) # Since the 1981 starting date is only "probable," we'll keep the 1987 # starting date below. +# +# I lived in San Diego for nine years; I always listened to KKGO (nee KBCA), +# a Los Angeles radio station. Perhaps San Diego radio doesn't affect culture. + +# From U.S. Naval Observatory (February 13, 1988): +# MEXICO BAJA CAL N 8 H BEHIND UTC IN WINTER; NORTH BAJA CAL, TIJUANA +# MEXICO BAJA CAL N 7 H BEHIND UTC APR 29 - OCT 29 +# MEXICO BAJA CAL S 7 H BEHIND UTC ALL YEAR; MAZATLAN +# MEXICO CENTRAL 6 H BEHIND UTC ALL YEAR; MEXICO CITY # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Mexico 1987 max - Oct lastSun 2:00 0 S @@ -162,11 +253,16 @@ Zone Mexico/General -6:00 - CST # Jamaica -# From Bob Devine (January 28, 1988): "Follows US rules." +# From Bob Devine (January 28, 1988): +# Follows US rules. # From U.S. Naval Observatory (February 10, 1988): -# JAMAICA 5 H BEHIND UTC IN WINTER -# JAMAICA 4 H BEHIND UTC APR 29 - OCT 29 +# JAMAICA 5 H BEHIND UTC IN WINTER +# JAMAICA 4 H BEHIND UTC APR 29 - OCT 29 + +# From Arthur David Olson (February 13, 1988): +# The Naval Observatory's (wrong) data for Jamaica matches its (wrong) data +# for the eastern US, so we'll assume that it does indeed follow US rules. Link US/Eastern Jamaica @@ -174,13 +270,14 @@ Link US/Eastern Jamaica # Cuba -# From Bob Devine (January 28, 1988): ". . .DST is from 2nd Sunday in May to -# 2nd Sunday in October since 1981. Change at midnight. In 1979 & 1980, -# started at 3rd Sunday in March (I think)." +# From Bob Devine (January 28, 1988): +# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981. +# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March +# (I think). # From U.S. Naval Observatory (February 10, 1988): -# CUBA 5 H BEHIND UTC IN WINTER -# CUBA 4 H BEHIND UTC MAY 8 - OCT 8 +# CUBA 5 H BEHIND UTC IN WINTER +# CUBA 4 H BEHIND UTC MAY 8 - OCT 8 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D