Update time zone data files to tzdata release 2021a.

DST law changes in Russia (Volgograd zone) and South Sudan.
Historical corrections for Australia, Bahamas, Belize, Bermuda,
Ghana, Israel, Kenya, Nigeria, Palestine, Seychelles, and Vanuatu.
Notably, the Australia/Currie zone has been corrected to the point
where it is identical to Australia/Hobart.

src/timezone/Makefile

@@ -60,9 +60,10 @@ ifeq (,$(with_system_tzdata))
 endif
 	$(MAKE) -C tznames $@
 
+# Note: -P code currently depends on '-b fat'.  Not worth fixing right now.
 abbrevs.txt: zic $(TZDATAFILES)
 	mkdir junkdir
-	$(ZIC) -P -d junkdir $(TZDATAFILES) | LANG=C sort | uniq >abbrevs.txt
+	$(ZIC) -P -b fat -d junkdir $(TZDATAFILES) | LANG=C sort | uniq >abbrevs.txt
 	rm -rf junkdir
 
 installdirs:

src/timezone/data/tzdata.zi

-# version 2020d
+# version 2021a
 # This zic input file is in the public domain.
 R d 1916 o - Jun 14 23s 1 S
 R d 1916 1919 - O Su>=1 23s 0 -
@@ -86,17 +86,24 @@ R K 2014 o - Jul 31 24 1 S
 R K 2014 o - S lastTh 24 0 -
 Z Africa/Cairo 2:5:9 - LMT 1900 O
 2 K EE%sT
-R GH 1920 1942 - S 1 0 0:20 -
-R GH 1920 1942 - D 31 0 0 -
-Z Africa/Accra -0:0:52 - LMT 1918
-0 GH GMT/+0020
+R GH 1919 o - N 24 0 0:20 +0020
+R GH 1920 1942 - Ja 1 2 0 GMT
+R GH 1920 1939 - S 1 2 0:20 +0020
+R GH 1940 1941 - May 1 2 0:20 +0020
+R GH 1950 1955 - S 1 2 0:30 +0030
+R GH 1951 1956 - Ja 1 2 0 GMT
+Z Africa/Accra -0:0:52 - LMT 1915 N 2
+0 GH %s 1942 F 8
+0:30 - +0030 1946 Ja 6
+0 GH %s
 Z Africa/Bissau -1:2:20 - LMT 1912 Ja 1 1u
 -1 - -01 1975
 0 - GMT
-Z Africa/Nairobi 2:27:16 - LMT 1928 Jul
-3 - EAT 1930
-2:30 - +0230 1940
-2:45 - +0245 1960
+Z Africa/Nairobi 2:27:16 - LMT 1908 May
+2:30 - +0230 1928 Jun 30 24
+3 - EAT 1930 Ja 4 24
+2:30 - +0230 1936 D 31 24
+2:45 - +0245 1942 Jul 31 24
 3 - EAT
 L Africa/Nairobi Africa/Addis_Ababa
 L Africa/Nairobi Africa/Asmara
@@ -353,7 +360,10 @@ Z Africa/Windhoek 1:8:24 - LMT 1892 F 8
 2 1 SAST 1943 Mar 21 2
 2 - SAST 1990 Mar 21
 2 NA %s
-Z Africa/Lagos 0:13:36 - LMT 1919 S
+Z Africa/Lagos 0:13:35 - LMT 1905 Jul
+0 - GMT 1908 Jul
+0:13:35 - LMT 1914
+0:30 - +0030 1919 S
 1 - WAT
 L Africa/Lagos Africa/Bangui
 L Africa/Lagos Africa/Brazzaville
@@ -371,7 +381,7 @@ Z Africa/Sao_Tome 0:26:56 - LMT 1884
 0 - GMT 2018 Ja 1 1
 1 - WAT 2019 Ja 1 2
 0 - GMT
-Z Indian/Mahe 3:41:48 - LMT 1906 Jun
+Z Indian/Mahe 3:41:48 - LMT 1907
 4 - +04
 R SA 1942 1943 - S Su>=15 2 1 -
 R SA 1943 1944 - Mar Su>=15 2 0 -
@@ -390,7 +400,8 @@ Z Africa/Khartoum 2:10:8 - LMT 1931
 2 - CAT
 Z Africa/Juba 2:6:28 - LMT 1931
 2 SD CA%sT 2000 Ja 15 12
-3 - EAT
+3 - EAT 2021 F
+2 - CAT
 R n 1939 o - Ap 15 23s 1 S
 R n 1939 o - N 18 23s 0 -
 R n 1940 o - F 25 23s 1 S
@@ -782,68 +793,66 @@ Z Asia/Baghdad 2:57:40 - LMT 1890
 2:57:36 - BMT 1918
 3 - +03 1982 May
 3 IQ +03/+04
-R Z 1940 o - Jun 1 0 1 D
-R Z 1942 1944 - N 1 0 0 S
-R Z 1943 o - Ap 1 2 1 D
-R Z 1944 o - Ap 1 0 1 D
-R Z 1945 o - Ap 16 0 1 D
-R Z 1945 o - N 1 2 0 S
-R Z 1946 o - Ap 16 2 1 D
-R Z 1946 o - N 1 0 0 S
-R Z 1948 o - May 23 0 2 DD
-R Z 1948 o - S 1 0 1 D
-R Z 1948 1949 - N 1 2 0 S
-R Z 1949 o - May 1 0 1 D
-R Z 1950 o - Ap 16 0 1 D
-R Z 1950 o - S 15 3 0 S
-R Z 1951 o - Ap 1 0 1 D
-R Z 1951 o - N 11 3 0 S
-R Z 1952 o - Ap 20 2 1 D
-R Z 1952 o - O 19 3 0 S
-R Z 1953 o - Ap 12 2 1 D
-R Z 1953 o - S 13 3 0 S
-R Z 1954 o - Jun 13 0 1 D
-R Z 1954 o - S 12 0 0 S
-R Z 1955 o - Jun 11 2 1 D
-R Z 1955 o - S 11 0 0 S
-R Z 1956 o - Jun 3 0 1 D
-R Z 1956 o - S 30 3 0 S
-R Z 1957 o - Ap 29 2 1 D
-R Z 1957 o - S 22 0 0 S
-R Z 1974 o - Jul 7 0 1 D
-R Z 1974 o - O 13 0 0 S
-R Z 1975 o - Ap 20 0 1 D
-R Z 1975 o - Au 31 0 0 S
-R Z 1980 o - Au 2 0 1 D
-R Z 1980 o - S 13 1 0 S
-R Z 1984 o - May 5 0 1 D
-R Z 1984 o - Au 25 1 0 S
-R Z 1985 o - Ap 14 0 1 D
-R Z 1985 o - S 15 0 0 S
-R Z 1986 o - May 18 0 1 D
-R Z 1986 o - S 7 0 0 S
-R Z 1987 o - Ap 15 0 1 D
-R Z 1987 o - S 13 0 0 S
-R Z 1988 o - Ap 10 0 1 D
-R Z 1988 o - S 4 0 0 S
-R Z 1989 o - Ap 30 0 1 D
-R Z 1989 o - S 3 0 0 S
-R Z 1990 o - Mar 25 0 1 D
-R Z 1990 o - Au 26 0 0 S
-R Z 1991 o - Mar 24 0 1 D
-R Z 1991 o - S 1 0 0 S
-R Z 1992 o - Mar 29 0 1 D
-R Z 1992 o - S 6 0 0 S
+R Z 1940 o - May 31 24u 1 D
+R Z 1940 o - S 30 24u 0 S
+R Z 1940 o - N 16 24u 1 D
+R Z 1942 1946 - O 31 24u 0 S
+R Z 1943 1944 - Mar 31 24u 1 D
+R Z 1945 1946 - Ap 15 24u 1 D
+R Z 1948 o - May 22 24u 2 DD
+R Z 1948 o - Au 31 24u 1 D
+R Z 1948 1949 - O 31 24u 0 S
+R Z 1949 o - Ap 30 24u 1 D
+R Z 1950 o - Ap 15 24u 1 D
+R Z 1950 o - S 14 24u 0 S
+R Z 1951 o - Mar 31 24u 1 D
+R Z 1951 o - N 10 24u 0 S
+R Z 1952 o - Ap 19 24u 1 D
+R Z 1952 o - O 18 24u 0 S
+R Z 1953 o - Ap 11 24u 1 D
+R Z 1953 o - S 12 24u 0 S
+R Z 1954 o - Jun 12 24u 1 D
+R Z 1954 o - S 11 24u 0 S
+R Z 1955 o - Jun 11 24u 1 D
+R Z 1955 o - S 10 24u 0 S
+R Z 1956 o - Jun 2 24u 1 D
+R Z 1956 o - S 29 24u 0 S
+R Z 1957 o - Ap 27 24u 1 D
+R Z 1957 o - S 21 24u 0 S
+R Z 1974 o - Jul 6 24 1 D
+R Z 1974 o - O 12 24 0 S
+R Z 1975 o - Ap 19 24 1 D
+R Z 1975 o - Au 30 24 0 S
+R Z 1980 o - Au 2 24s 1 D
+R Z 1980 o - S 13 24s 0 S
+R Z 1984 o - May 5 24s 1 D
+R Z 1984 o - Au 25 24s 0 S
+R Z 1985 o - Ap 13 24 1 D
+R Z 1985 o - Au 31 24 0 S
+R Z 1986 o - May 17 24 1 D
+R Z 1986 o - S 6 24 0 S
+R Z 1987 o - Ap 14 24 1 D
+R Z 1987 o - S 12 24 0 S
+R Z 1988 o - Ap 9 24 1 D
+R Z 1988 o - S 3 24 0 S
+R Z 1989 o - Ap 29 24 1 D
+R Z 1989 o - S 2 24 0 S
+R Z 1990 o - Mar 24 24 1 D
+R Z 1990 o - Au 25 24 0 S
+R Z 1991 o - Mar 23 24 1 D
+R Z 1991 o - Au 31 24 0 S
+R Z 1992 o - Mar 28 24 1 D
+R Z 1992 o - S 5 24 0 S
 R Z 1993 o - Ap 2 0 1 D
 R Z 1993 o - S 5 0 0 S
 R Z 1994 o - Ap 1 0 1 D
 R Z 1994 o - Au 28 0 0 S
 R Z 1995 o - Mar 31 0 1 D
 R Z 1995 o - S 3 0 0 S
-R Z 1996 o - Mar 15 0 1 D
-R Z 1996 o - S 16 0 0 S
-R Z 1997 o - Mar 21 0 1 D
-R Z 1997 o - S 14 0 0 S
+R Z 1996 o - Mar 14 24 1 D
+R Z 1996 o - S 15 24 0 S
+R Z 1997 o - Mar 20 24 1 D
+R Z 1997 o - S 13 24 0 S
 R Z 1998 o - Mar 20 0 1 D
 R Z 1998 o - S 6 0 0 S
 R Z 1999 o - Ap 2 2 1 D
@@ -1256,13 +1265,13 @@ Z Asia/Ho_Chi_Minh 7:6:40 - LMT 1906 Jul
 7 - +07 1959 D 31 23
 8 - +08 1975 Jun 13
 7 - +07
-R AU 1917 o - Ja 1 0:1 1 D
-R AU 1917 o - Mar 25 2 0 S
-R AU 1942 o - Ja 1 2 1 D
-R AU 1942 o - Mar 29 2 0 S
-R AU 1942 o - S 27 2 1 D
-R AU 1943 1944 - Mar lastSu 2 0 S
-R AU 1943 o - O 3 2 1 D
+R AU 1917 o - Ja 1 2s 1 D
+R AU 1917 o - Mar lastSu 2s 0 S
+R AU 1942 o - Ja 1 2s 1 D
+R AU 1942 o - Mar lastSu 2s 0 S
+R AU 1942 o - S 27 2s 1 D
+R AU 1943 1944 - Mar lastSu 2s 0 S
+R AU 1943 o - O 3 2s 1 D
 Z Australia/Darwin 8:43:20 - LMT 1895 F
 9 - ACST 1899 May
 9:30 AU AC%sT
@@ -1313,8 +1322,12 @@ Z Australia/Adelaide 9:14:20 - LMT 1895 F
 9 - ACST 1899 May
 9:30 AU AC%sT 1971
 9:30 AS AC%sT
+R AT 1916 o - O Su>=1 2s 1 D
+R AT 1917 o - Mar lastSu 2s 0 S
+R AT 1917 1918 - O Su>=22 2s 1 D
+R AT 1918 1919 - Mar Su>=1 2s 0 S
 R AT 1967 o - O Su>=1 2s 1 D
-R AT 1968 o - Mar lastSu 2s 0 S
+R AT 1968 o - Mar Su>=29 2s 0 S
 R AT 1968 1985 - O lastSu 2s 1 D
 R AT 1969 1971 - Mar Su>=8 2s 0 S
 R AT 1972 o - F lastSu 2s 0 S
@@ -1333,15 +1346,9 @@ R AT 2006 o - Ap Su>=1 2s 0 S
 R AT 2007 o - Mar lastSu 2s 0 S
 R AT 2008 ma - Ap Su>=1 2s 0 S
 Z Australia/Hobart 9:49:16 - LMT 1895 S
-10 - AEST 1916 O 1 2
-10 1 AEDT 1917 F
+10 AT AE%sT 1919 O 24
 10 AU AE%sT 1967
 10 AT AE%sT
-Z Australia/Currie 9:35:28 - LMT 1895 S
-10 - AEST 1916 O 1 2
-10 1 AEDT 1917 F
-10 AU AE%sT 1971 Jul
-10 AT AE%sT
 R AV 1971 1985 - O lastSu 2s 1 D
 R AV 1972 o - F lastSu 2s 0 S
 R AV 1973 1985 - Mar Su>=1 2s 0 S
@@ -1615,12 +1622,12 @@ Z Pacific/Funafuti 11:56:52 - LMT 1901
 12 - +12
 Z Pacific/Wake 11:6:28 - LMT 1901
 12 - +12
-R VU 1983 o - S 25 0 1 -
-R VU 1984 1991 - Mar Su>=23 0 0 -
-R VU 1984 o - O 23 0 1 -
-R VU 1985 1991 - S Su>=23 0 1 -
-R VU 1992 1993 - Ja Su>=23 0 0 -
-R VU 1992 o - O Su>=23 0 1 -
+R VU 1973 o - D 22 12u 1 -
+R VU 1974 o - Mar 30 12u 0 -
+R VU 1983 1991 - S Sa>=22 24 1 -
+R VU 1984 1991 - Mar Sa>=22 24 0 -
+R VU 1992 1993 - Ja Sa>=22 24 0 -
+R VU 1992 o - O Sa>=22 24 1 -
 Z Pacific/Efate 11:13:16 - LMT 1912 Ja 13
 11 VU +11/+12
 Z Pacific/Wallis 12:15:20 - LMT 1901
@@ -2463,7 +2470,8 @@ Z Europe/Volgograd 2:57:40 - LMT 1920 Ja 3
 3 R +03/+04 2011 Mar 27 2s
 4 - +04 2014 O 26 2s
 3 - +03 2018 O 28 2s
-4 - +04
+4 - +04 2020 D 27 2s
+3 - +03
 Z Europe/Saratov 3:4:18 - LMT 1919 Jul 1 0u
 3 - +03 1930 Jun 21
 4 R +04/+05 1988 Mar 27 2s
@@ -3546,6 +3554,11 @@ Z America/Tijuana -7:48:4 - LMT 1922 Ja 1 0:11:56
 -8 u P%sT 2002 F 20
 -8 m P%sT 2010
 -8 u P%sT
+R BS 1942 o - May 1 24 1 W
+R BS 1944 o - D 31 24 0 S
+R BS 1945 o - F 1 0 1 W
+R BS 1945 o - Au 14 23u 1 P
+R BS 1945 o - O 17 24 0 S
 R BS 1964 1975 - O lastSu 2 0 S
 R BS 1964 1975 - Ap lastSu 2 1 D
 Z America/Nassau -5:9:30 - LMT 1912 Mar 2
@@ -3559,16 +3572,38 @@ R BB 1980 o - S 25 2 0 S
 Z America/Barbados -3:58:29 - LMT 1924
 -3:58:29 - BMT 1932
 -4 BB A%sT
-R BZ 1918 1942 - O Su>=2 0 0:30 -0530
-R BZ 1919 1943 - F Su>=9 0 0 CST
+R BZ 1918 1941 - O Sa>=1 24 0:30 -0530
+R BZ 1919 1942 - F Sa>=8 24 0 CST
+R BZ 1942 o - Jun 27 24 1 CWT
+R BZ 1945 o - Au 14 23u 1 CPT
+R BZ 1945 o - D 15 24 0 CST
+R BZ 1947 1967 - O Sa>=1 24 0:30 -0530
+R BZ 1948 1968 - F Sa>=8 24 0 CST
 R BZ 1973 o - D 5 0 1 CDT
 R BZ 1974 o - F 9 0 0 CST
 R BZ 1982 o - D 18 0 1 CDT
 R BZ 1983 o - F 12 0 0 CST
 Z America/Belize -5:52:48 - LMT 1912 Ap
 -6 BZ %s
-Z Atlantic/Bermuda -4:19:18 - LMT 1930 Ja 1 2
--4 - AST 1974 Ap 28 2
+R Be 1917 o - Ap 5 24 1 -
+R Be 1917 o - S 30 24 0 -
+R Be 1918 o - Ap 13 24 1 -
+R Be 1918 o - S 15 24 0 S
+R Be 1942 o - Ja 11 2 1 D
+R Be 1942 o - O 18 2 0 S
+R Be 1943 o - Mar 21 2 1 D
+R Be 1943 o - O 31 2 0 S
+R Be 1944 1945 - Mar Su>=8 2 1 D
+R Be 1944 1945 - N Su>=1 2 0 S
+R Be 1947 o - May Su>=15 2 1 D
+R Be 1947 o - S Su>=8 2 0 S
+R Be 1948 1952 - May Su>=22 2 1 D
+R Be 1948 1952 - S Su>=1 2 0 S
+R Be 1956 o - May Su>=22 2 1 D
+R Be 1956 o - O lastSu 2 0 S
+Z Atlantic/Bermuda -4:19:18 - LMT 1890
+-4:19:18 Be BMT/BST 1930 Ja 1 2
+-4 Be A%sT 1974 Ap 28 2
 -4 C A%sT 1976
 -4 u A%sT
 R CR 1979 1980 - F lastSu 0 1 D
@@ -3707,7 +3742,7 @@ Z America/Miquelon -3:44:40 - LMT 1911 May 15
 Z America/Grand_Turk -4:44:32 - LMT 1890
 -5:7:10 - KMT 1912 F
 -5 - EST 1979
--5 u E%sT 2015 N Su>=1 2
+-5 u E%sT 2015 Mar 8 2
 -4 - AST 2018 Mar 11 3
 -5 u E%sT
 R A 1930 o - D 1 0 1 -
@@ -4343,6 +4378,7 @@ L Atlantic/Faroe Atlantic/Faeroe
 L Europe/Oslo Atlantic/Jan_Mayen
 L Australia/Sydney Australia/ACT
 L Australia/Sydney Australia/Canberra
+L Australia/Hobart Australia/Currie
 L Australia/Lord_Howe Australia/LHI
 L Australia/Sydney Australia/NSW
 L Australia/Darwin Australia/North