Update.

2004-07-28  GOTO Masanori  <gotom@debian.or.jp>

	* timezone/asia: Update from tzdata2004b.
	* timezone/backward: Likewise.
	* timezone/europe: Likewise.
	* timezone/iso3166.tab: Likewise.
	* timezone/leapseconds: Likewise.
	* timezone/northamerica: Likewise.
	* timezone/southamerica: Likewise.
	* timezone/zone.tab: Likewise.

	* timezone/private.h: Update from tzcode2004b.
	* timezone/zic.c: Likewise.

11 files changed, 348 insertions, 127 deletions

diff --git a/ChangeLog b/ChangeLog
index b7d78ee600..15a0012898 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2004-07-28  GOTO Masanori  <gotom@debian.or.jp>
+
+	* timezone/asia: Update from tzdata2004b.
+	* timezone/backward: Likewise.
+	* timezone/europe: Likewise.
+	* timezone/iso3166.tab: Likewise.
+	* timezone/leapseconds: Likewise.
+	* timezone/northamerica: Likewise.
+	* timezone/southamerica: Likewise.
+	* timezone/zone.tab: Likewise.
+
+	* timezone/private.h: Update from tzcode2004b.
+	* timezone/zic.c: Likewise.
+
 2004-07-27  Ulrich Drepper  <drepper@redhat.com>
 
 	* nscd/grpcache.c (cache_addgr): If necessary, add entry also
diff --git a/timezone/asia b/timezone/asia
index 496809313c..4417134dac 100644
--- a/timezone/asia
+++ b/timezone/asia
@@ -1,4 +1,4 @@
-# @(#)asia	7.72
+# @(#)asia	7.75
 
 # This data is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
@@ -335,6 +335,16 @@ Link	Asia/Nicosia	Europe/Nicosia
 # Instead of putting back clocks at the end of October, Georgia
 # will stay on daylight savings time this winter to save energy,
 # President Eduard Shevardnadze decreed Wednesday.
+#
+# From the BBC via Joseph S. Myers (2004-06-27):
+#  	
+# Georgia moved closer to Western Europe on Sunday...  The former Soviet
+# republic has changed its time zone back to that of Moscow.  As a result it
+# is now just four hours ahead of Greenwich Mean Time, rather than five hours
+# ahead.  The switch was decreed by the pro-Western president of Georgia,
+# Mikhail Saakashvili, who said the change was partly prompted by the process
+# of integration into Europe.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Tbilisi	2:59:16 -	LMT	1880
 			2:59:16	-	TBMT	1924 May  2 # Tbilisi Mean Time
@@ -345,7 +355,8 @@ Zone	Asia/Tbilisi	2:59:16 -	LMT	1880
 			3:00 E-EurAsia	GE%sT	1994 Sep lastSun
 			4:00 E-EurAsia	GE%sT	1996 Oct lastSun
 			4:00	1:00	GEST	1997 Mar lastSun
-			4:00 E-EurAsia	GE%sT
+			4:00 E-EurAsia	GE%sT	2004 Jun 27
+			3:00 RussiaAsia	GE%sT
 
 # East Timor
 
@@ -380,7 +391,7 @@ Zone	Asia/Dili	8:22:20 -	LMT	1912
 
 # India
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	Asia/Calcutta	5:53:28 -	LMT	1880
+Zone	Asia/Calcutta	5:53:28 -	LMT	1880	# Kolkata
 			5:53:20	-	HMT	1941 Oct    # Howrah Mean Time?
 			6:30	-	BURT	1942 May 15 # Burma Time
 			5:30	-	IST	1942 Sep
@@ -1011,22 +1022,29 @@ Zone	Asia/Beirut	2:22:00 -	LMT	1880
 Rule	NBorneo	1935	1941	-	Sep	14	0:00	0:20	TS # one-Third Summer
 Rule	NBorneo	1935	1941	-	Dec	14	0:00	0	-
 #
-# Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 # peninsular Malaysia
-Zone Asia/Kuala_Lumpur	6:46:48 -	LMT	1880
-			6:55:24	-	SMT	1905 Jun # Singapore Mean Time
-			7:00	-	MALT	1933	 # Malaya Time
-			7:20	-	MALT	1942 Feb 15
-			9:00	-	JST	1945 Sep 2
-			7:20	-	MALT	1950
-			7:30	-	MALT	1982 May
+# The data here are taken from Mok Ly Yng (2003-10-30)
+# <http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html>.
+# Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+Zone Asia/Kuala_Lumpur	6:46:46 -	LMT	1901 Jan  1
+			6:55:25	-	SMT	1905 Jun  1 # Singapore M.T.
+			7:00	-	MALT	1933 Jan  1 # Malaya Time
+			7:00	0:20	MALST	1936 Jan  1
+			7:20	-	MALT	1941 Sep  1
+			7:30	-	MALT	1942 Feb 16
+			9:00	-	JST	1945 Sep 12
+			7:30	-	MALT	1982 Jan  1
 			8:00	-	MYT	# Malaysia Time
 # Sabah & Sarawak
+# From Paul Eggert (2003-11-01):
+# The data here are mostly from Shanks, but the 1942, 1945 and 1982
+# transition dates are from Mok Ly Yng.
+# Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone Asia/Kuching	7:21:20	-	LMT	1926 Mar
 			7:30	-	BORT	1933	# Borneo Time
-			8:00	NBorneo	BOR%sT	1942
-			9:00	-	JST	1945 Sep 2
-			8:00	-	BORT	1982 May
+			8:00	NBorneo	BOR%sT	1942 Feb 16
+			9:00	-	JST	1945 Sep 12
+			8:00	-	BORT	1982 Jan  1
 			8:00	-	MYT
 
 # Maldives
@@ -1078,6 +1096,15 @@ Zone	Indian/Maldives	4:54:00 -	LMT	1880	# Male
 #
 # [The province of Selenge is omitted from the above lists.]
 
+# From Ganbold Ts., Ulaanbaatar <ganbold@micom.mng.net> (2004-04-17):
+# Daylight saving occurs at 02:00 local time last Saturday of March.
+# It will change back to normal at 02:00 local time last Saturday of
+# September.... As I remember this rule was changed in 2001.
+#
+# From Paul Eggert (2004-04-17):
+# For now, assume Rives McDow's informant got confused about Friday vs
+# Saturday, and that his 2001 dates should have 1 added to them.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Mongol	1983	1984	-	Apr	1	0:00	1:00	S
 Rule	Mongol	1983	only	-	Oct	1	0:00	0	-
@@ -1087,8 +1114,9 @@ Rule	Mongol	1983	only	-	Oct	1	0:00	0	-
 Rule	Mongol	1985	1998	-	Mar	lastSun	2:00s	1:00	S
 Rule	Mongol	1984	1998	-	Sep	lastSun	2:00s	0	-
 # IATA SSIM (1999-09) says Mongolia no longer observes DST.
-Rule	Mongol	2001	only	-	Apr	27	2:00s	1:00	S
-Rule	Mongol	2001	only	-	Sep	28	2:00s	0	-
+Rule	Mongol	2001	only	-	Apr	lastSat	2:00	1:00	S
+Rule	Mongol	2001	max	-	Sep	lastSat	2:00	0	-
+Rule	Mongol	2002	max	-	Mar	lastSat	2:00	1:00	S
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 # Hovd, a.k.a. Chovd, Dund-Us, Dzhargalant, Khovd, Jirgalanta
@@ -1295,15 +1323,18 @@ Zone	Asia/Riyadh	3:06:52 -	LMT	1950
 			3:00	-	AST
 
 # Singapore
+# The data here are taken from Mok Ly Yng (2003-10-30)
+# <http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html>.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	Asia/Singapore	6:55:24 -	LMT	1880
-			6:55:24	-	SMT	1905 Jun # Singapore Mean Time
-			7:00	-	MALT	1933	 # Malaya Time
-			7:20	-	MALT	1942 Feb 15
-			9:00	-	JST	1945 Sep  2
-			7:20	-	MALT	1950
+Zone	Asia/Singapore	6:55:25 -	LMT	1901 Jan  1
+			6:55:25	-	SMT	1905 Jun  1 # Singapore M.T.
+			7:00	-	MALT	1933 Jan  1 # Malaya Time
+			7:00	0:20	MALST	1936 Jan  1
+			7:20	-	MALT	1941 Sep  1
+			7:30	-	MALT	1942 Feb 16
+			9:00	-	JST	1945 Sep 12
 			7:30	-	MALT	1965 Aug  9 # independence
-			7:30	-	SGT	1982 May # Singapore Time
+			7:30	-	SGT	1982 Jan  1 # Singapore Time
 			8:00	-	SGT
 
 # Spratly Is
diff --git a/timezone/backward b/timezone/backward
index 8ae66f7fdc..6e118c2726 100644
--- a/timezone/backward
+++ b/timezone/backward
@@ -1,12 +1,17 @@
-# @(#)backward	7.24
+# @(#)backward	7.26
 
 # This file provides links between current names for time zones
 # and their old names.  Many names changed in late 1993.
 
 Link	America/Adak		America/Atka
+Link	America/Argentina/Buenos_Aires	America/Buenos_Aires
+Link	America/Argentina/Catamarca	America/Catamarca
+Link	America/Argentina/Cordoba	America/Cordoba
 Link	America/Tijuana		America/Ensenada
 Link	America/Indianapolis	America/Fort_Wayne
+Link	America/Argentina/Jujuy	America/Jujuy
 Link	America/Indiana/Knox	America/Knox_IN
+Link	America/Argentina/Mendoza	America/Mendoza
 Link	America/Rio_Branco	America/Porto_Acre
 Link	America/Cordoba		America/Rosario
 Link	America/St_Thomas	America/Virgin
@@ -65,7 +70,7 @@ Link	Africa/Tripoli		Libya
 Link	America/Tijuana		Mexico/BajaNorte
 Link	America/Mazatlan	Mexico/BajaSur
 Link	America/Mexico_City	Mexico/General
-Link	America/Denver		Navajo
+Link	America/Shiprock	Navajo
 Link	Pacific/Auckland	NZ
 Link	Pacific/Chatham		NZ-CHAT
 Link	Pacific/Pago_Pago	Pacific/Samoa
diff --git a/timezone/europe b/timezone/europe
index 0bd7ed827a..eeb114f881 100644
--- a/timezone/europe
+++ b/timezone/europe
@@ -1,4 +1,4 @@
-# @(#)europe	7.84
+# @(#)europe	7.88
 
 # This data is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
@@ -129,7 +129,7 @@
 # transition date for London, namely 1847-12-01.  We don't know as much
 # about Dublin, so we use 1880-08-02, the legal transition time.
 
-# From Paul Eggert (2003-07-29):
+# From Paul Eggert (2003-09-27):
 # Summer Time was first seriously proposed by William Willett (1857-1915),
 # a London builder and member of the Royal Astronomical Society
 # who circulated a pamphlet ``The Waste of Daylight'' (1907)
@@ -141,7 +141,7 @@
 # it was eventually adopted as a wartime measure in 1916.
 # See: Summer Time Arrives Early, The Times (2000-05-18).
 # A monument to Willett was unveiled on 1927-05-21, in an open space in
-# a 45-acre wood near Chiselhurst, Kent that was purchased by popular
+# a 45-acre wood near Chislehurst, Kent that was purchased by popular
 # subscription and open to the public.  On the south face of the monolith,
 # designed by G. W. Miller, is the the William Willett Memorial Sundial,
 # which is permanently set to Summer Time.
@@ -707,6 +707,9 @@ Zone	Europe/Sofia	1:33:16 -	LMT	1880
 # Croatia
 # see Serbia and Montenegro
 
+# Cyprus
+# See the `asia' file.
+
 # Czech Republic
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Czech	1945	only	-	Apr	 8	2:00s	1:00	S
@@ -918,6 +921,10 @@ Zone	Europe/Helsinki	1:39:52 -	LMT	1878 May 31
 			2:00	Finland	EE%sT	1981 Mar 29 2:00
 			2:00	EU	EE%sT
 
+# Aaland Is
+Link	Europe/Helsinki	Europe/Mariehamn
+
+
 # France
 
 # From Ciro Discepolo (2000-12-20):
@@ -1831,7 +1838,7 @@ Zone Europe/Bucharest	1:44:24 -	LMT	1891 Oct
 #
 # From Andrey A. Chernov <ache@nagual.ru> (1996-10-04):
 # `MSK' and `MSD' were born and used initially on Moscow computers with
-# Unix-like OSes by several developer groups (e.g. Demos group, Kiae group)....
+# UNIX-like OSes by several developer groups (e.g. Demos group, Kiae group)....
 # The next step was the UUCP network, the Relcom predecessor
 # (used mainly for mail), and MSK/MSD was actively used there.
 #
@@ -1952,28 +1959,26 @@ Zone Asia/Irkutsk	 6:57:20 -	LMT	1880
 			 7:00	Russia	IRK%sT	1992 Jan 19 2:00s
 			 8:00	Russia	IRK%sT
 #
-# From Oscar van Vlijmen (2001-08-25): [This region consists of]
+# From Oscar van Vlijmen (2003-10-18): [This region consists of]
 # Aginskij Buryatskij avtonomnyj okrug, Amurskaya oblast',
 # [parts of] Respublika Sakha (Yakutiya), Chitinskaya oblast'.
-#
-# From Alan Pritchard (2001-08-24): [The Sakha districts are:]
-# Aldansky, Amginsky, Anabarsky, Bulunsky, Churapchinsky,
-# Eveno-Bytantaisky, Gorny, Khangalassky, Kobyaisky, Lensky,
-# Megino-Kangalassky, Mirninsky, Namsky, Nyurbinsky, Olenyoksky,
-# Olyokminsky, Srednekolymsky, Suntarsky, Tattinsky, Ust-Aldansky,
-# Verkhnekolymsky, Verkhnevilyuisky, Vilyuisky, Zhigansky.
+# The Sakha districts are: Aldanskij, Amginskij, Anabarskij,
+# Bulunskij, Verkhnekolymskij, Verkhnevilyujskij, Vilyujskij, Gornyj,
+# Zhiganskij, Kobyajskij, Lenskij, Megino-Kangalasskij, Mirninskij,
+# Namskij, Nyurbinskij, Olenekskij, Olekminskij, Srednekolymskij,
+# Suntarskij, Tattinskij, Ust'-Aldanskij, Khangalasskij,
+# Churapchinskij, Eveno-Bytantajskij.
 Zone Asia/Yakutsk	 8:38:40 -	LMT	1919 Dec 15
 			 8:00	-	YAKT	1930 Jun 21 # Yakutsk Time
 			 9:00	Russia	YAK%sT	1991 Mar 31 2:00s
 			 8:00	Russia	YAK%sT	1992 Jan 19 2:00s
 			 9:00	Russia	YAK%sT
 #
-# From Oscar van Vlijmen (2001-08-25): [This region consists of]
+# From Oscar van Vlijmen (2003-10-18): [This region consists of]
 # Evrejskaya avtonomnaya oblast', Khabarovskij kraj, Primorskij kraj,
 # [parts of] Respublika Sakha (Yakutiya).
-#
-# From Alan Pritchard (2001-08-24): [The Sakha districts are:]
-# Tomponsky, Ust-Maisky, Ust-Yansky, Verkhoyansky.
+# The Sakha districts are: Verkhoyanskij, Tomponskij, Ust'-Majskij,
+# Ust'-Yanskij.
 Zone Asia/Vladivostok	 8:47:44 -	LMT	1922 Nov 15
 			 9:00	-	VLAT	1930 Jun 21 # Vladivostok Time
 			10:00	Russia	VLA%sT	1991 Mar 31 2:00s
@@ -1990,11 +1995,11 @@ Zone Asia/Sakhalin	 9:30:48 -	LMT	1905 Aug 23
 			11:00	Russia	SAK%sT	1997 Mar lastSun 2:00s
 			10:00	Russia	SAK%sT
 #
-# From Oscar van Vlijmen (2001-08-25): [This region consists of]
+# From Oscar van Vlijmen (2003-10-18): [This region consists of]
 # Magadanskaya oblast', Respublika Sakha (Yakutiya).
-#
-# From Alan Pritchard (2001-08-24): [The Sakha districts are:]
-# Abyisky, Allaikhovsky, Momsky, Nizhnekolymsky, Oimyakonsky.
+# Probably also: Kuril Islands.
+# The Sakha districts are: Abyjskij, Allaikhovskij, Momskij,
+# Nizhnekolymskij, Ojmyakonskij.
 Zone Asia/Magadan	10:03:12 -	LMT	1924 May  2
 			10:00	-	MAGT	1930 Jun 21 # Magadan Time
 			11:00	Russia	MAG%sT	1991 Mar 31 2:00s
diff --git a/timezone/iso3166.tab b/timezone/iso3166.tab
index acd4960889..b17843ac8e 100644
--- a/timezone/iso3166.tab
+++ b/timezone/iso3166.tab
@@ -1,12 +1,12 @@
 # ISO 3166 alpha-2 country codes
 #
-# @(#)iso3166.tab	1.9
+# @(#)iso3166.tab	1.15
 #
-# From Paul Eggert <eggert@twinsun.com> (2003-02-04):
+# From Paul Eggert <eggert@twinsun.com> (2004-06-14):
 #
 # This file contains a table with the following columns:
 # 1.  ISO 3166-1 alpha-2 country code, current as of
-#     ISO 3166-1 Newsletter No. V-8 (2003-07-23).  See:
+#     ISO 3166-1 Newsletter No. V-10 (2004-04-26).  See:
 #     <a href="http://www.iso.org/iso/en/prods-services/iso3166ma/index.html">
 #     ISO 3166 Maintenance agency (ISO 3166/MA)
 #     </a>.
@@ -36,6 +36,7 @@ AS	Samoa (American)
 AT	Austria
 AU	Australia
 AW	Aruba
+AX	Aaland Islands
 AZ	Azerbaijan
 BA	Bosnia & Herzegovina
 BB	Barbados
diff --git a/timezone/leapseconds b/timezone/leapseconds
index 0e7d8c8454..7add3303f2 100644
--- a/timezone/leapseconds
+++ b/timezone/leapseconds
@@ -1,4 +1,4 @@
-# @(#)leapseconds	7.16
+# @(#)leapseconds	7.17
 
 # Allowance for leapseconds added to each timezone file.
 
@@ -44,19 +44,20 @@ Leap	1995	Dec	31	23:59:60	+	S
 Leap	1997	Jun	30	23:59:60	+	S
 Leap	1998	Dec	31	23:59:60	+	S
 
-# 		INTERNATIONAL EARTH ROTATION SERVICE (IERS)
-# 		SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE
+# 	INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
+# 
+# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
 # 
 # SERVICE DE LA ROTATION TERRESTRE
 # OBSERVATOIRE DE PARIS
 # 61, Av. de l'Observatoire 75014 PARIS (France)
 # Tel.      : 33 (0) 1 40 51 22 26
 # FAX       : 33 (0) 1 40 51 22 91
-# Internet  : iers@obspm.fr
+# Internet  : services.iers@obspm.fr
 # 
-# 				 		Paris, 1 July 2003
+# 						Paris, 15 January 2004
 # 
-# 						Bulletin C 26
+# 						Bulletin C 27
 # 
 # 						To authorities responsible
 # 						for the measurement and
@@ -64,10 +65,10 @@ Leap	1998	Dec	31	23:59:60	+	S
 # 
 # 			INFORMATION ON UTC - TAI
 # 
-# NO positive leap second will be introduced at the end of December 2003.
+# NO positive leap second will be introduced at the end of June 2004.
 # The difference between UTC and the International Atomic Time TAI is:
-# 		
-# 	from 1999 January 1, 0h UTC, until further notice: UTC-TAI = -32 s
+# 
+# 	from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s
 # 
 # Leap seconds can be introduced in UTC at the end of the months of December
 # or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
@@ -77,3 +78,4 @@ Leap	1998	Dec	31	23:59:60	+	S
 # 					Daniel GAMBIS
 # 					Director
 # 					Earth Orientation Center of IERS
+# 					Observatoire de Paris, France
diff --git a/timezone/northamerica b/timezone/northamerica
index ca4ad5de57..6e755b04b3 100644
--- a/timezone/northamerica
+++ b/timezone/northamerica
@@ -1,4 +1,4 @@
-# @(#)northamerica	7.63
+# @(#)northamerica	7.69
 # also includes Central America and the Caribbean
 
 # This data is by no means authoritative; if you think you know better,
@@ -193,10 +193,6 @@ Rule	US	1987	max	-	Apr	Sun>=1	2:00	1:00	D
 #	Samoa standard time
 # The law doesn't give abbreviations.
 #
-# From Paul Eggert (1995-12-19):
-# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
-# Go with Shanks.
-#
 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
 # Public law 106-564 (2000-12-23) introduced the abbreviation
 # "Chamorro Standard Time" for time in Guam and the Northern Marianas.
@@ -228,7 +224,9 @@ Zone America/New_York	-4:56:02 -	LMT	1883 Nov 18 12:00
 
 # US central time, represented by Chicago
 
-# Alabama, Arkansas, Florida panhandle, Illinois, western Indiana
+# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
+# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
+# Washington counties), Illinois, western Indiana
 # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
 # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
 # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
@@ -258,7 +256,7 @@ Zone America/North_Dakota/Center -6:45:12 - LMT	1883 Nov 18 12:00
 
 # US mountain time, represented by Denver
 #
-# Colorado, southern Idaho, far western Kansas, Montana, western
+# Colorado, far western Kansas, Montana, western
 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
 # New Mexico, southwestern North Dakota, far eastern Oregon,
 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
@@ -280,7 +278,9 @@ Zone America/Denver	-6:59:56 -	LMT	1883 Nov 18 12:00
 
 # US Pacific time, represented by Los Angeles
 #
-# California, northern Idaho, most of Nevada, most of Oregon, and Washington
+# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
+# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties),
+# most of Nevada, most of Oregon, and Washington
 #
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER
 Rule	CA	1948	only	-	Mar	14	2:00	1:00	D
@@ -319,13 +319,14 @@ Zone America/Juneau	 15:02:19 -	LMT	1867 Oct 18
 			 -8:00	US	P%sT	1946
 			 -8:00	-	PST	1969
 			 -8:00	US	P%sT	1983 Oct 30 2:00
+			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Yakutat	 14:41:05 -	LMT	1867 Oct 18
 			 -9:18:55 -	LMT	1900 Aug 20 12:00
 			 -9:00	-	YST	1942
 			 -9:00	US	Y%sT	1946
 			 -9:00	-	YST	1969
-			 -9:00	US	Y%sT	1983 Oct 30 2:00
+			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Anchorage	 14:00:24 -	LMT	1867 Oct 18
 			 -9:59:36 -	LMT	1900 Aug 20 12:00
@@ -334,6 +335,7 @@ Zone America/Anchorage	 14:00:24 -	LMT	1867 Oct 18
 			-10:00	-	CAT	1967 Apr
 			-10:00	-	AHST	1969
 			-10:00	US	AH%sT	1983 Oct 30 2:00
+			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Nome	 12:58:21 -	LMT	1867 Oct 18
 			-11:01:38 -	LMT	1900 Aug 20 12:00
@@ -342,6 +344,7 @@ Zone America/Nome	 12:58:21 -	LMT	1867 Oct 18
 			-11:00	-	NST	1967 Apr
 			-11:00	-	BST	1969
 			-11:00	US	B%sT	1983 Oct 30 2:00
+			 -9:00	US	Y%sT	1983 Nov 30
 			 -9:00	US	AK%sT
 Zone America/Adak	 12:13:21 -	LMT	1867 Oct 18
 			-11:46:38 -	LMT	1900 Aug 20 12:00
@@ -350,6 +353,7 @@ Zone America/Adak	 12:13:21 -	LMT	1867 Oct 18
 			-11:00	-	NST	1967 Apr
 			-11:00	-	BST	1969
 			-11:00	US	B%sT	1983 Oct 30 2:00
+			-10:00	US	AH%sT	1983 Nov 30
 			-10:00	US	HA%sT
 # Shanks writes that part of southwest Alaska (e.g. Aniak)
 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
@@ -405,14 +409,20 @@ Zone America/Phoenix	-7:28:18 -	LMT	1883 Nov 18 12:00
 			-7:00	-	MST
 # From Arthur David Olson (1988-02-13):
 # A writer from the Inter Tribal Council of Arizona, Inc.,
-# notes in private correspondence dated 12/28/87 that "Presently, only the
+# notes in private correspondence dated 1987-12-28 that "Presently, only the
 # Navajo Nation participates in the Daylight Saving Time policy, due to its
 # large size and location in three states."  (The "only" means that other
 # tribal nations don't use DST.)
 
 Link America/Denver America/Shiprock
 
-# Southern Idaho and eastern Oregon switched four weeks late in 1974.
+# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
+# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
+# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
+# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
+# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon
+# switched four weeks late in 1974.
+# 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Boise	-7:44:49 -	LMT	1883 Nov 18 12:00
 			-8:00	US	P%sT	1923 May 13 2:00
@@ -951,10 +961,18 @@ Rule	Mont	1922	only	-	Apr	30	2:00	1:00	D
 Rule	Mont	1924	only	-	May	17	2:00	1:00	D
 Rule	Mont	1924	1926	-	Sep	lastSun	2:30	0	S
 Rule	Mont	1925	1926	-	May	Sun>=1	2:00	1:00	D
-Rule	Mont	1927	1937	-	Apr	lastSat	24:00	1:00	D
-Rule	Mont	1927	1937	-	Sep	lastSat	24:00	0	S
-Rule	Mont	1938	1940	-	Apr	lastSun	0:00	1:00	D
-Rule	Mont	1938	1939	-	Sep	lastSun	0:00	0	S
+# The 1927-to-1937 rules can be expressed more simply as
+# Rule	Mont	1927	1937	-	Apr	lastSat	24:00	1:00	D
+# Rule	Mont	1927	1937	-	Sep	lastSat	24:00	0	S
+# The rules below avoid use of 24:00
+# (which pre-1998 versions of zic cannot handle).
+Rule	Mont	1927	only	-	May	1	0:00	1:00	D
+Rule	Mont	1927	1932	-	Sep	lastSun	0:00	0	S
+Rule	Mont	1928	1931	-	Apr	lastSun	0:00	1:00	D
+Rule	Mont	1932	only	-	May	1	0:00	1:00	D
+Rule	Mont	1933	1940	-	Apr	lastSun	0:00	1:00	D
+Rule	Mont	1933	only	-	Oct	1	0:00	0	S
+Rule	Mont	1934	1939	-	Sep	lastSun	0:00	0	S
 Rule	Mont	1946	1973	-	Apr	lastSun	2:00	1:00	D
 Rule	Mont	1945	1948	-	Sep	lastSun	2:00	0	S
 Rule	Mont	1949	1950	-	Oct	lastSun	2:00	0	S
@@ -971,14 +989,19 @@ Rule	Toronto	1922	1923	-	May	Sun>=8	2:00	1:00	D
 # Shanks says 1923-09-19; assume it's a typo and that "-16" was meant.
 Rule	Toronto	1922	1926	-	Sep	Sun>=15	2:00	0	S
 Rule	Toronto	1924	1927	-	May	Sun>=1	2:00	1:00	D
-Rule	Toronto	1927	1928	-	Sep	lastSun	2:00	0	S
-Rule	Toronto	1928	only	-	Apr	lastSun	2:00	1:00	D
-Rule	Toronto	1929	only	-	Apr	lastSun	0:00	1:00	D
-Rule	Toronto	1929	only	-	Sep	lastSun	0:00	0	S
-Rule	Toronto	1930	1937	-	Apr	lastSat	24:00	1:00	D
-Rule	Toronto	1930	1937	-	Sep	lastSat	24:00	0	S
-Rule	Toronto	1938	1940	-	Apr	lastSun	0:00	1:00	D
-Rule	Toronto	1938	1939	-	Sep	lastSun	0:00	0	S
+# The 1927-to-1939 rules can be expressed more simply as
+# Rule	Toronto	1927	1937	-	Sep	Sun>=25	2:00	0	S
+# Rule	Toronto	1928	1937	-	Apr	Sun>=25	2:00	1:00	D
+# Rule	Toronto	1938	1940	-	Apr	lastSun	2:00	1:00	D
+# Rule	Toronto	1938	1939	-	Sep	lastSun	2:00	0	S
+# The rules below avoid use of Sun>=25
+# (which pre-2004 versions of zic cannot handle).
+Rule	Toronto	1927	1932	-	Sep	lastSun	2:00	0	S
+Rule	Toronto	1928	1931	-	Apr	lastSun	2:00	1:00	D
+Rule	Toronto	1932	only	-	May	1	2:00	1:00	D
+Rule	Toronto	1933	1940	-	Apr	lastSun	2:00	1:00	D
+Rule	Toronto	1933	only	-	Oct	1	2:00	0	S
+Rule	Toronto	1934	1939	-	Sep	lastSun	2:00	0	S