Update tzdata and zoneinfo to version 2021c.

Author: GitHub Actions

tzdata/Makefile

@@ -504,7 +504,7 @@ MANTXTS=	newctime.3.txt newstrftime.3.txt newtzset.3.txt \
 			tzfile.5.txt tzselect.8.txt zic.8.txt zdump.8.txt \
 			date.1.txt
 COMMON=		calendars CONTRIBUTING LICENSE Makefile \
-			NEWS README theory.html version
+			NEWS README SECURITY theory.html version
 WEB_PAGES=	tz-art.html tz-how-to.html tz-link.html
 CHECK_WEB_PAGES=check_theory.html check_tz-art.html \
 			check_tz-how-to.html check_tz-link.html
@@ -539,7 +539,7 @@ ENCHILADA = $(EIGHT_YARDS) $(TZS)
 # This list is not the same as the output of 'git ls-files', since
 # .gitignore is not distributed.
 VERSION_DEPS= \
-		calendars CONTRIBUTING LICENSE Makefile NEWS README \
+		calendars CONTRIBUTING LICENSE Makefile NEWS README SECURITY \
 		africa antarctica asctime.c asia australasia \
 		backward backzone \
 		checklinks.awk checktab.awk \
@@ -763,7 +763,7 @@ check_character_set: $(ENCHILADA)
 		sharp='#' && \
 		! grep -Env $(SAFE_LINE) $(MANS) date.1 $(MANTXTS) \
 			$(MISC) $(SOURCES) $(WEB_PAGES) \
-			CONTRIBUTING LICENSE README \
+			CONTRIBUTING LICENSE README SECURITY \
 			version tzdata.zi && \
 		! grep -Env $(SAFE_LINE)'|^UNUSUAL_OK_'$(OK_CHAR)'*$$' \
 			Makefile && \

tzdata/NEWS

@@ -1,5 +1,41 @@
 News for the tz database
 
+Release 2021c - 2021-10-01 14:21:49 -0700
+
+  Briefly:
+    Revert most 2021b changes to 'backward'.
+    Fix 'zic -b fat' bug in pre-1970 32-bit data.
+    Fix two Link line typos.
+    Distribute SECURITY file.
+
+    This release is intended as a bugfix release, to fix compatibility
+    problems and typos reported since 2021b was released.
+
+  Changes to Link directives
+
+    Revert almost all of 2021b's changes to the 'backward' file,
+    by moving Link directives back to where they were in 2021a.
+    Although 'zic' doesn't care which source file contains a Link
+    directive, some downstream uses ran into trouble with the move.
+    (Problem reported by Stephen Colebourne for Joda-Time.)
+
+    Fix typo that linked Atlantic/Jan_Mayen to the wrong location
+    (problem reported by Chris Walton).
+
+    Fix 'backzone' typo that linked America/Virgin to the wrong
+    location (problem reported by Michael Deckers).
+
+  Changes to code
+
+    Fix a bug in 'zic -b fat' that caused old timestamps to be
+    mishandled in 32-bit-only readers (problem reported by Daniel
+    Fischer).
+
+  Changes to documentation
+
+    Distribute the SECURITY file (problem reported by Andreas Radke).
+
+
 Release 2021b - 2021-09-24 16:23:00 -0700
 
   Briefly:
@@ -18,13 +54,13 @@ Release 2021b - 2021-09-24 16:23:00 -0700
     tzfile.5 better matches a draft successor to RFC 8536.
     A new file SECURITY.
 
-  This release is prompted by recent announcements by Jordan and Samoa.
-  It incorporates many other changes that had accumulated since 2021a.
-  However, it omits most proposed changes that merged all Zones
-  agreeing since 1970, as concerns were raised about doing too many of
-  these changes at once.  It does keeps some of these changes in the
-  interest of making tzdb more equitable one step at a time; see
-  "Merge more location-based Zones" below.
+    This release is prompted by recent announcements by Jordan and Samoa.
+    It incorporates many other changes that had accumulated since 2021a.
+    However, it omits most proposed changes that merged all Zones
+    agreeing since 1970, as concerns were raised about doing too many of
+    these changes at once.  It does keeps some of these changes in the
+    interest of making tzdb more equitable one step at a time; see
+    "Merge more location-based Zones" below.
 
   Changes to future timestamps
 

tzdata/SECURITY

@@ -0,0 +1,15 @@
+Please report any sensitive security-related bugs via email to the
+tzdb designated coordinators, currently Paul Eggert
+<[email protected]> and Tim Parenti <[email protected]>.
+Put "tzdb security" at the start of your email's subject line.
+We prefer communications to be in English.
+
+You should receive a response within a week. If not, please follow up
+via email to make sure we received your original message.
+
+If we confirm the bug, we plan to notify affected third-party services
+or software that we know about, prepare an advisory, commit fixes to
+the main development branch as quickly as is practical, and finally
+publish the advisory on [email protected].  As with all tzdb contributions,
+we give credit to security contributors unless they wish to remain
+anonymous.

tzdata/africa

@@ -150,6 +150,16 @@ Zone	Africa/Ndjamena	1:00:12 -	LMT	1912        # N'Djamena
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Abidjan	-0:16:08 -	LMT	1912
 			 0:00	-	GMT
+Link Africa/Abidjan Africa/Accra	# Ghana
+Link Africa/Abidjan Africa/Bamako	# Mali
+Link Africa/Abidjan Africa/Banjul	# The Gambia
+Link Africa/Abidjan Africa/Conakry	# Guinea
+Link Africa/Abidjan Africa/Dakar	# Senegal
+Link Africa/Abidjan Africa/Freetown	# Sierra Leone
+Link Africa/Abidjan Africa/Lome		# Togo
+Link Africa/Abidjan Africa/Nouakchott	# Mauritania
+Link Africa/Abidjan Africa/Ouagadougou	# Burkina Faso
+Link Africa/Abidjan Atlantic/St_Helena	# St Helena
 
 # Djibouti
 # See Africa/Nairobi.
@@ -436,6 +446,15 @@ Zone	Africa/Nairobi	2:27:16	-	LMT	1908 May
 			2:30	-	+0230	1936 Dec 31 24:00
 			2:45	-	+0245	1942 Jul 31 24:00
 			3:00	-	EAT
+Link Africa/Nairobi Africa/Addis_Ababa	 # Ethiopia
+Link Africa/Nairobi Africa/Asmara	 # Eritrea
+Link Africa/Nairobi Africa/Dar_es_Salaam # Tanzania
+Link Africa/Nairobi Africa/Djibouti
+Link Africa/Nairobi Africa/Kampala	 # Uganda
+Link Africa/Nairobi Africa/Mogadishu	 # Somalia
+Link Africa/Nairobi Indian/Antananarivo	 # Madagascar
+Link Africa/Nairobi Indian/Comoro
+Link Africa/Nairobi Indian/Mayotte
 
 # Lesotho
 # See Africa/Johannesburg.
@@ -1122,6 +1141,13 @@ Zone Africa/El_Aaiun	-0:52:48 -	LMT	1934 Jan # El Aaiún
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Maputo	2:10:20 -	LMT	1903 Mar
 			2:00	-	CAT
+Link Africa/Maputo Africa/Blantyre	# Malawi
+Link Africa/Maputo Africa/Bujumbura	# Burundi
+Link Africa/Maputo Africa/Gaborone	# Botswana
+Link Africa/Maputo Africa/Harare	# Zimbabwe
+Link Africa/Maputo Africa/Kigali	# Rwanda
+Link Africa/Maputo Africa/Lubumbashi	# E Dem. Rep. of Congo
+Link Africa/Maputo Africa/Lusaka	# Zambia
 
 
 # Namibia
@@ -1269,6 +1295,15 @@ Zone	Africa/Lagos	0:13:35 -	LMT	1905 Jul  1
 			0:13:35	-	LMT	1914 Jan  1
 			0:30	-	+0030	1919 Sep  1
 			1:00	-	WAT
+Link Africa/Lagos Africa/Bangui		# Central African Republic
+Link Africa/Lagos Africa/Brazzaville	# Rep. of the Congo
+Link Africa/Lagos Africa/Douala		# Cameroon
+Link Africa/Lagos Africa/Kinshasa	# Dem. Rep. of the Congo (west)
+Link Africa/Lagos Africa/Libreville	# Gabon
+Link Africa/Lagos Africa/Luanda		# Angola
+Link Africa/Lagos Africa/Malabo		# Equatorial Guinea
+Link Africa/Lagos Africa/Niamey		# Niger
+Link Africa/Lagos Africa/Porto-Novo	# Benin
 
 # Réunion
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
@@ -1366,6 +1401,8 @@ Rule	SA	1943	1944	-	Mar	Sun>=15	2:00	0	-
 Zone Africa/Johannesburg 1:52:00 -	LMT	1892 Feb 8
 			1:30	-	SAST	1903 Mar
 			2:00	SA	SAST
+Link Africa/Johannesburg Africa/Maseru	# Lesotho
+Link Africa/Johannesburg Africa/Mbabane	# Eswatini
 #
 # Marion and Prince Edward Is
 # scientific station since 1947

tzdata/asia

@@ -1173,9 +1173,10 @@ Zone	Asia/Famagusta	2:15:48	-	LMT	1921 Nov 14
 			2:00	EUAsia	EE%sT	2016 Sep  8
 			3:00	-	+03	2017 Oct 29 1:00u
 			2:00	EUAsia	EE%sT
+
 # Classically, Cyprus belongs to Asia; e.g. see Herodotus, Histories, I.72.
 # However, for various reasons many users expect to find it under Europe.
-# See the 'backward' file for the Europe/Nicosia link.
+Link	Asia/Nicosia	Europe/Nicosia
 
 # Georgia
 # From Paul Eggert (1994-11-19):
@@ -3531,6 +3532,7 @@ Zone	Asia/Manila	-15:56:00 -	LMT	1844 Dec 31
 Zone	Asia/Qatar	3:26:08 -	LMT	1920     # Al Dawhah / Doha
 			4:00	-	+04	1972 Jun
 			3:00	-	+03
+Link Asia/Qatar Asia/Bahrain
 
 # Saudi Arabia
 #
@@ -3577,6 +3579,9 @@ Zone	Asia/Qatar	3:26:08 -	LMT	1920     # Al Dawhah / Doha
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Riyadh	3:06:52 -	LMT	1947 Mar 14
 			3:00	-	+03
+Link Asia/Riyadh Antarctica/Syowa
+Link Asia/Riyadh Asia/Aden	# Yemen
+Link Asia/Riyadh Asia/Kuwait
 
 # Singapore
 # taken from Mok Ly Yng (2003-10-30)
@@ -3833,6 +3838,8 @@ Zone	Asia/Dushanbe	4:35:12 -	LMT	1924 May  2
 Zone	Asia/Bangkok	6:42:04	-	LMT	1880
 			6:42:04	-	BMT	1920 Apr # Bangkok Mean Time
 			7:00	-	+07
+Link Asia/Bangkok Asia/Phnom_Penh	# Cambodia
+Link Asia/Bangkok Asia/Vientiane	# Laos
 
 # Turkmenistan
 # From Shanks & Pottenger.
@@ -3847,6 +3854,7 @@ Zone	Asia/Ashgabat	3:53:32 -	LMT	1924 May  2 # or Ashkhabad
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Dubai	3:41:12 -	LMT	1920
 			4:00	-	+04
+Link Asia/Dubai Asia/Muscat	# Oman
 
 # Uzbekistan
 # Byalokoz 1919 says Uzbekistan was 4:27:53.

tzdata/australasia

@@ -458,6 +458,7 @@ Zone	Pacific/Guam	-14:21:00 -	LMT	1844 Dec 31
 			 9:00	-	+09	1944 Jul 31
 			10:00	Guam	G%sT	2000 Dec 23
 			10:00	-	ChST	# Chamorro Standard Time
+Link Pacific/Guam Pacific/Saipan # N Mariana Is
 
 # Kiribati
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
@@ -583,6 +584,8 @@ Zone Pacific/Chatham	12:13:48 -	LMT	1868 Nov  2
 			12:15	-	+1215	1946 Jan  1
 			12:45	Chatham	+1245/+1345
 
+Link Pacific/Auckland Antarctica/McMurdo
+
 # Auckland Is
 # uninhabited; Māori and Moriori, colonial settlers, pastoralists, sealers,
 # and scientific personnel have wintered
@@ -676,6 +679,7 @@ Zone Pacific/Palau	-15:02:04 -	LMT	1844 Dec 31	# Koror
 Zone Pacific/Port_Moresby 9:48:40 -	LMT	1880
 			9:48:32	-	PMMT	1895 # Port Moresby Mean Time
 			10:00	-	+10
+Link Pacific/Port_Moresby Antarctica/DumontDUrville
 #
 # From Paul Eggert (2014-10-13):
 # Base the Bougainville entry on the Arawa-Kieta region, which appears to have
@@ -711,6 +715,7 @@ Zone Pacific/Pitcairn	-8:40:20 -	LMT	1901        # Adamstown
 Zone Pacific/Pago_Pago	 12:37:12 -	LMT	1892 Jul  5
 			-11:22:48 -	LMT	1911
 			-11:00	-	SST	            # S=Samoa
+Link Pacific/Pago_Pago Pacific/Midway # in US minor outlying islands
 
 # Samoa (formerly and also known as Western Samoa)