standardization and changes

SCCS-file: northamerica SCCS-SID: 3.11
2025-11-22 20:55:11 +00:00 · 1988-02-13 12:20:22 -05:00
parent a8270175ee
commit 10f93774da
1 changed files with 133 additions and 36 deletions
--- a/159
+++ b/159
@ -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
+
+# 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
@ -162,21 +253,27 @@ 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

+# 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

 ###############################################################################

 # 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