diff --git a/lib/pytz/__init__.py b/lib/pytz/__init__.py
index 8b6bd646..6ef4366b 100644
--- a/lib/pytz/__init__.py
+++ b/lib/pytz/__init__.py
@@ -22,8 +22,8 @@ from pytz.tzfile import build_tzinfo
 
 
 # The IANA (nee Olson) database is updated several times a year.
-OLSON_VERSION = '2019c'
-VERSION = '2019.3'  # pip compatible version number.
+OLSON_VERSION = '2021c'
+VERSION = '2021.3'  # pip compatible version number.
 __version__ = VERSION
 
 OLSEN_VERSION = OLSON_VERSION  # Old releases had this misspelling
@@ -34,7 +34,7 @@ __all__ = [
     'NonExistentTimeError', 'UnknownTimeZoneError',
     'all_timezones', 'all_timezones_set',
     'common_timezones', 'common_timezones_set',
-    'BaseTzInfo',
+    'BaseTzInfo', 'FixedOffset',
 ]
 
 
@@ -111,6 +111,13 @@ def open_resource(name):
 def resource_exists(name):
     """Return true if the given resource exists"""
     try:
+        if os.environ.get('PYTZ_SKIPEXISTSCHECK', ''):
+            # In "standard" distributions, we can assume that
+            # all the listed timezones are present. As an
+            # import-speed optimization, you can set the
+            # PYTZ_SKIPEXISTSCHECK flag to skip checking
+            # for the presence of the resource file on disk.
+            return True
         open_resource(name).close()
         return True
     except IOError:
@@ -263,8 +270,8 @@ def _UTC():
     module global.
 
     These examples belong in the UTC class above, but it is obscured; or in
-    the README.txt, but we are not depending on Python 2.4 so integrating
-    the README.txt examples with the unit tests is not trivial.
+    the README.rst, but we are not depending on Python 2.4 so integrating
+    the README.rst examples with the unit tests is not trivial.
 
     >>> import datetime, pickle
     >>> dt = datetime.datetime(2005, 3, 1, 14, 13, 21, tzinfo=utc)
@@ -683,6 +690,7 @@ all_timezones = \
  'America/North_Dakota/Beulah',
  'America/North_Dakota/Center',
  'America/North_Dakota/New_Salem',
+ 'America/Nuuk',
  'America/Ojinaga',
  'America/Panama',
  'America/Pangnirtung',
@@ -1050,6 +1058,7 @@ all_timezones = \
  'Pacific/Guam',
  'Pacific/Honolulu',
  'Pacific/Johnston',
+ 'Pacific/Kanton',
  'Pacific/Kiritimati',
  'Pacific/Kosrae',
  'Pacific/Kwajalein',
@@ -1210,7 +1219,6 @@ common_timezones = \
  'America/Fort_Nelson',
  'America/Fortaleza',
  'America/Glace_Bay',
- 'America/Godthab',
  'America/Goose_Bay',
  'America/Grand_Turk',
  'America/Grenada',
@@ -1264,6 +1272,7 @@ common_timezones = \
  'America/North_Dakota/Beulah',
  'America/North_Dakota/Center',
  'America/North_Dakota/New_Salem',
+ 'America/Nuuk',
  'America/Ojinaga',
  'America/Panama',
  'America/Pangnirtung',
@@ -1412,7 +1421,6 @@ common_timezones = \
  'Australia/Adelaide',
  'Australia/Brisbane',
  'Australia/Broken_Hill',
- 'Australia/Currie',
  'Australia/Darwin',
  'Australia/Eucla',
  'Australia/Hobart',
@@ -1506,7 +1514,6 @@ common_timezones = \
  'Pacific/Chuuk',
  'Pacific/Easter',
  'Pacific/Efate',
- 'Pacific/Enderbury',
  'Pacific/Fakaofo',
  'Pacific/Fiji',
  'Pacific/Funafuti',
@@ -1515,6 +1522,7 @@ common_timezones = \
  'Pacific/Guadalcanal',
  'Pacific/Guam',
  'Pacific/Honolulu',
+ 'Pacific/Kanton',
  'Pacific/Kiritimati',
  'Pacific/Kosrae',
  'Pacific/Kwajalein',
diff --git a/lib/pytz/exceptions.py b/lib/pytz/exceptions.py
index 18df33e8..4b20bde9 100644
--- a/lib/pytz/exceptions.py
+++ b/lib/pytz/exceptions.py
@@ -8,7 +8,11 @@ __all__ = [
 ]
 
 
-class UnknownTimeZoneError(KeyError):
+class Error(Exception):
+    '''Base class for all exceptions raised by the pytz library'''
+
+
+class UnknownTimeZoneError(KeyError, Error):
     '''Exception raised when pytz is passed an unknown timezone.
 
     >>> isinstance(UnknownTimeZoneError(), LookupError)
@@ -20,11 +24,18 @@ class UnknownTimeZoneError(KeyError):
 
     >>> isinstance(UnknownTimeZoneError(), KeyError)
     True
+
+    And also a subclass of pytz.exceptions.Error, as are other pytz
+    exceptions.
+
+    >>> isinstance(UnknownTimeZoneError(), Error)
+    True
+
     '''
     pass
 
 
-class InvalidTimeError(Exception):
+class InvalidTimeError(Error):
     '''Base class for invalid time exceptions.'''
 
 
diff --git a/lib/pytz/tests/test_docs.py b/lib/pytz/tests/test_docs.py
index c4ed4a3d..d3b4b94a 100644
--- a/lib/pytz/tests/test_docs.py
+++ b/lib/pytz/tests/test_docs.py
@@ -7,12 +7,12 @@ import sys
 
 THIS_DIR = os.path.dirname(__file__)
 
-README = os.path.join(THIS_DIR, os.pardir, os.pardir, 'README.txt')
+README = os.path.join(THIS_DIR, os.pardir, os.pardir, 'README.rst')
 
 
 class DocumentationTestCase(unittest.TestCase):
     def test_readme_encoding(self):
-        '''Confirm the README.txt is pure ASCII.'''
+        '''Confirm the README.rst is ASCII.'''
         f = open(README, 'rb')
         try:
             f.read().decode('ASCII')
@@ -24,7 +24,7 @@ def test_suite():
     "For the Z3 test runner"
     return unittest.TestSuite((
         DocumentationTestCase('test_readme_encoding'),
-        DocFileSuite(os.path.join(os.pardir, os.pardir, 'README.txt'))))
+        DocFileSuite(os.path.join(os.pardir, os.pardir, 'README.rst'))))
 
 
 if __name__ == '__main__':
diff --git a/lib/pytz/tests/test_tzinfo.py b/lib/pytz/tests/test_tzinfo.py
index 7d759af7..a16c8704 100644
--- a/lib/pytz/tests/test_tzinfo.py
+++ b/lib/pytz/tests/test_tzinfo.py
@@ -27,8 +27,8 @@ from pytz.tzinfo import DstTzInfo, StaticTzInfo  # noqa
 
 # I test for expected version to ensure the correct version of pytz is
 # actually being tested.
-EXPECTED_VERSION = '2019.3'
-EXPECTED_OLSON_VERSION = '2019c'
+EXPECTED_VERSION = '2021.3'
+EXPECTED_OLSON_VERSION = '2021c'
 
 fmt = '%Y-%m-%d %H:%M:%S %Z%z'
 
@@ -859,6 +859,7 @@ def test_suite():
     suite = unittest.TestSuite()
     suite.addTest(doctest.DocTestSuite('pytz'))
     suite.addTest(doctest.DocTestSuite('pytz.tzinfo'))
+    suite.addTest(doctest.DocTestSuite('pytz.exceptions'))
     import test_tzinfo
     suite.addTest(unittest.defaultTestLoader.loadTestsFromModule(test_tzinfo))
     return suite
diff --git a/lib/pytz/tzfile.py b/lib/pytz/tzfile.py
index 25117f32..99e74489 100644
--- a/lib/pytz/tzfile.py
+++ b/lib/pytz/tzfile.py
@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 '''
 $Id: tzfile.py,v 1.8 2004/06/03 00:15:24 zenzen Exp $
 '''
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index 9a2918f4..9dcfc19c 100644
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index 440ef06b..1ebd0664 100644
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index 3c0bef20..91f6f8bc 100644
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index dab1f3f6..999c367c 100644
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diff --git a/lib/pytz/zoneinfo/Pacific/Efate b/lib/pytz/zoneinfo/Pacific/Efate
index 60150175..d8d4093b 100644
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diff --git a/lib/pytz/zoneinfo/Pacific/Enderbury b/lib/pytz/zoneinfo/Pacific/Enderbury
index f0b82523..39b786e9 100644
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diff --git a/lib/pytz/zoneinfo/Pacific/Fiji b/lib/pytz/zoneinfo/Pacific/Fiji
index d39bf536..e71691ee 100644
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diff --git a/lib/pytz/zoneinfo/Pacific/Kanton b/lib/pytz/zoneinfo/Pacific/Kanton
new file mode 100644
index 00000000..39b786e9
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diff --git a/lib/pytz/zoneinfo/Pacific/Niue b/lib/pytz/zoneinfo/Pacific/Niue
index 684b010e..89117b37 100644
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diff --git a/lib/pytz/zoneinfo/Pacific/Rarotonga b/lib/pytz/zoneinfo/Pacific/Rarotonga
index da6b0fad..eea37aba 100644
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diff --git a/lib/pytz/zoneinfo/Pacific/Tongatapu b/lib/pytz/zoneinfo/Pacific/Tongatapu
index 5553c600..c2e5999b 100644
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diff --git a/lib/pytz/zoneinfo/Portugal b/lib/pytz/zoneinfo/Portugal
index 355817b5..55f01930 100644
Binary files a/lib/pytz/zoneinfo/Portugal and b/lib/pytz/zoneinfo/Portugal differ
diff --git a/lib/pytz/zoneinfo/leapseconds b/lib/pytz/zoneinfo/leapseconds
index 7808df8f..834b96ea 100644
--- a/lib/pytz/zoneinfo/leapseconds
+++ b/lib/pytz/zoneinfo/leapseconds
@@ -6,6 +6,10 @@
 # NIST format leap-seconds.list file, which can be copied from
 # <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
 # or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>.
+# The NIST file is used instead of its IERS upstream counterpart
+# <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list>
+# because under US law the NIST file is public domain
+# whereas the IERS file's copyright and license status is unclear.
 # For more about leap-seconds.list, please see
 # The NTP Timescale and Leap Seconds
 # <https://www.eecis.udel.edu/~mills/leap.html>.
@@ -64,9 +68,15 @@ Leap	2012	Jun	30	23:59:60	+	S
 Leap	2015	Jun	30	23:59:60	+	S
 Leap	2016	Dec	31	23:59:60	+	S
 
+# UTC timestamp when this leap second list expires.
+# Any additional leap seconds will come after this.
+# This Expires line is commented out for now,
+# so that pre-2020a zic implementations do not reject this file.
+#Expires 2022	Jun	28	00:00:00
+
 # POSIX timestamps for the data in this file:
 #updated 1467936000 (2016-07-08 00:00:00 UTC)
-#expires 1593302400 (2020-06-28 00:00:00 UTC)
+#expires 1656374400 (2022-06-28 00:00:00 UTC)
 
-#	Updated through IERS Bulletin C58
-#	File expires on:  28 June 2020
+#	Updated through IERS Bulletin C62
+#	File expires on:  28 June 2022
diff --git a/lib/pytz/zoneinfo/posixrules b/lib/pytz/zoneinfo/posixrules
deleted file mode 100644
index 2f75480e..00000000
Binary files a/lib/pytz/zoneinfo/posixrules and /dev/null differ
diff --git a/lib/pytz/zoneinfo/tzdata.zi b/lib/pytz/zoneinfo/tzdata.zi
index 4229d999..e16ab09f 100644
--- a/lib/pytz/zoneinfo/tzdata.zi
+++ b/lib/pytz/zoneinfo/tzdata.zi
@@ -1,4 +1,4 @@
-# version unknown
+# version unknown-dirty
 # 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 -
@@ -22,7 +22,7 @@ R d 1978 o - Mar 24 1 1 S
 R d 1978 o - S 22 3 0 -
 R d 1980 o - Ap 25 0 1 S
 R d 1980 o - O 31 2 0 -
-Z Africa/Algiers 0:12:12 - LMT 1891 Mar 15 0:1
+Z Africa/Algiers 0:12:12 - LMT 1891 Mar 16
 0:9:21 - PMT 1911 Mar 11
 0 d WE%sT 1940 F 25 2
 1 d CE%sT 1946 O 7
@@ -43,6 +43,7 @@ Z Africa/Ndjamena 1:0:12 - LMT 1912
 1 - WAT
 Z Africa/Abidjan -0:16:8 - LMT 1912
 0 - GMT
+L Africa/Abidjan Africa/Accra
 L Africa/Abidjan Africa/Bamako
 L Africa/Abidjan Africa/Banjul
 L Africa/Abidjan Africa/Conakry
@@ -86,17 +87,14 @@ 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
 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
@@ -187,13 +185,13 @@ R M 2018 o - Jun 17 2 1 -
 R M 2019 o - May 5 3 -1 -
 R M 2019 o - Jun 9 2 0 -
 R M 2020 o - Ap 19 3 -1 -
-R M 2020 o - May 24 2 0 -
+R M 2020 o - May 31 2 0 -
 R M 2021 o - Ap 11 3 -1 -
 R M 2021 o - May 16 2 0 -
 R M 2022 o - Mar 27 3 -1 -
 R M 2022 o - May 8 2 0 -
 R M 2023 o - Mar 19 3 -1 -
-R M 2023 o - Ap 23 2 0 -
+R M 2023 o - Ap 30 2 0 -
 R M 2024 o - Mar 10 3 -1 -
 R M 2024 o - Ap 14 2 0 -
 R M 2025 o - F 23 3 -1 -
@@ -203,13 +201,13 @@ R M 2026 o - Mar 22 2 0 -
 R M 2027 o - F 7 3 -1 -
 R M 2027 o - Mar 14 2 0 -
 R M 2028 o - Ja 23 3 -1 -
-R M 2028 o - F 27 2 0 -
+R M 2028 o - Mar 5 2 0 -
 R M 2029 o - Ja 14 3 -1 -
 R M 2029 o - F 18 2 0 -
 R M 2029 o - D 30 3 -1 -
 R M 2030 o - F 10 2 0 -
 R M 2030 o - D 22 3 -1 -
-R M 2031 o - Ja 26 2 0 -
+R M 2031 o - F 2 2 0 -
 R M 2031 o - D 14 3 -1 -
 R M 2032 o - Ja 18 2 0 -
 R M 2032 o - N 28 3 -1 -
@@ -219,13 +217,13 @@ R M 2033 o - D 25 2 0 -
 R M 2034 o - N 5 3 -1 -
 R M 2034 o - D 17 2 0 -
 R M 2035 o - O 28 3 -1 -
-R M 2035 o - D 2 2 0 -
+R M 2035 o - D 9 2 0 -
 R M 2036 o - O 19 3 -1 -
 R M 2036 o - N 23 2 0 -
 R M 2037 o - O 4 3 -1 -
 R M 2037 o - N 15 2 0 -
 R M 2038 o - S 26 3 -1 -
-R M 2038 o - O 31 2 0 -
+R M 2038 o - N 7 2 0 -
 R M 2039 o - S 18 3 -1 -
 R M 2039 o - O 23 2 0 -
 R M 2040 o - S 2 3 -1 -
@@ -235,13 +233,13 @@ R M 2041 o - S 29 2 0 -
 R M 2042 o - Au 10 3 -1 -
 R M 2042 o - S 21 2 0 -
 R M 2043 o - Au 2 3 -1 -
-R M 2043 o - S 6 2 0 -
+R M 2043 o - S 13 2 0 -
 R M 2044 o - Jul 24 3 -1 -
 R M 2044 o - Au 28 2 0 -
 R M 2045 o - Jul 9 3 -1 -
 R M 2045 o - Au 20 2 0 -
 R M 2046 o - Jul 1 3 -1 -
-R M 2046 o - Au 5 2 0 -
+R M 2046 o - Au 12 2 0 -
 R M 2047 o - Jun 23 3 -1 -
 R M 2047 o - Jul 28 2 0 -
 R M 2048 o - Jun 7 3 -1 -
@@ -251,13 +249,13 @@ R M 2049 o - Jul 4 2 0 -
 R M 2050 o - May 15 3 -1 -
 R M 2050 o - Jun 26 2 0 -
 R M 2051 o - May 7 3 -1 -
-R M 2051 o - Jun 11 2 0 -
+R M 2051 o - Jun 18 2 0 -
 R M 2052 o - Ap 28 3 -1 -
 R M 2052 o - Jun 2 2 0 -
 R M 2053 o - Ap 13 3 -1 -
 R M 2053 o - May 25 2 0 -
 R M 2054 o - Ap 5 3 -1 -
-R M 2054 o - May 10 2 0 -
+R M 2054 o - May 17 2 0 -
 R M 2055 o - Mar 28 3 -1 -
 R M 2055 o - May 2 2 0 -
 R M 2056 o - Mar 12 3 -1 -
@@ -267,65 +265,65 @@ R M 2057 o - Ap 8 2 0 -
 R M 2058 o - F 17 3 -1 -
 R M 2058 o - Mar 31 2 0 -
 R M 2059 o - F 9 3 -1 -
-R M 2059 o - Mar 16 2 0 -
+R M 2059 o - Mar 23 2 0 -
 R M 2060 o - F 1 3 -1 -
 R M 2060 o - Mar 7 2 0 -
 R M 2061 o - Ja 16 3 -1 -
 R M 2061 o - F 27 2 0 -
 R M 2062 o - Ja 8 3 -1 -
-R M 2062 o - F 12 2 0 -
+R M 2062 o - F 19 2 0 -
 R M 2062 o - D 31 3 -1 -
 R M 2063 o - F 4 2 0 -
 R M 2063 o - D 16 3 -1 -
-R M 2064 o - Ja 20 2 0 -
+R M 2064 o - Ja 27 2 0 -
 R M 2064 o - D 7 3 -1 -
 R M 2065 o - Ja 11 2 0 -
 R M 2065 o - N 22 3 -1 -
 R M 2066 o - Ja 3 2 0 -
 R M 2066 o - N 14 3 -1 -
-R M 2066 o - D 19 2 0 -
+R M 2066 o - D 26 2 0 -
 R M 2067 o - N 6 3 -1 -
 R M 2067 o - D 11 2 0 -
 R M 2068 o - O 21 3 -1 -
 R M 2068 o - D 2 2 0 -
 R M 2069 o - O 13 3 -1 -
-R M 2069 o - N 17 2 0 -
+R M 2069 o - N 24 2 0 -
 R M 2070 o - O 5 3 -1 -
 R M 2070 o - N 9 2 0 -
 R M 2071 o - S 20 3 -1 -
-R M 2071 o - O 25 2 0 -
+R M 2071 o - N 1 2 0 -
 R M 2072 o - S 11 3 -1 -
 R M 2072 o - O 16 2 0 -
 R M 2073 o - Au 27 3 -1 -
 R M 2073 o - O 8 2 0 -
 R M 2074 o - Au 19 3 -1 -
-R M 2074 o - S 23 2 0 -
+R M 2074 o - S 30 2 0 -
 R M 2075 o - Au 11 3 -1 -
 R M 2075 o - S 15 2 0 -
 R M 2076 o - Jul 26 3 -1 -
 R M 2076 o - S 6 2 0 -
 R M 2077 o - Jul 18 3 -1 -
-R M 2077 o - Au 22 2 0 -
+R M 2077 o - Au 29 2 0 -
 R M 2078 o - Jul 10 3 -1 -
 R M 2078 o - Au 14 2 0 -
 R M 2079 o - Jun 25 3 -1 -
-R M 2079 o - Jul 30 2 0 -
+R M 2079 o - Au 6 2 0 -
 R M 2080 o - Jun 16 3 -1 -
 R M 2080 o - Jul 21 2 0 -
 R M 2081 o - Jun 1 3 -1 -
 R M 2081 o - Jul 13 2 0 -
 R M 2082 o - May 24 3 -1 -
-R M 2082 o - Jun 28 2 0 -
+R M 2082 o - Jul 5 2 0 -
 R M 2083 o - May 16 3 -1 -
 R M 2083 o - Jun 20 2 0 -
 R M 2084 o - Ap 30 3 -1 -
 R M 2084 o - Jun 11 2 0 -
 R M 2085 o - Ap 22 3 -1 -
-R M 2085 o - May 27 2 0 -
+R M 2085 o - Jun 3 2 0 -
 R M 2086 o - Ap 14 3 -1 -
 R M 2086 o - May 19 2 0 -
 R M 2087 o - Mar 30 3 -1 -
-R M 2087 o - May 4 2 0 -
+R M 2087 o - May 11 2 0 -
 Z Africa/Casablanca -0:30:20 - LMT 1913 O 26
 0 M +00/+01 1984 Mar 16
 1 - +01 1986
@@ -353,7 +351,10 @@ 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 +372,7 @@ 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 +391,8 @@ 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
@@ -426,7 +428,12 @@ Z Antarctica/Casey 0 - -00 1969
 11 - +11 2012 F 21 17u
 8 - +08 2016 O 22
 11 - +11 2018 Mar 11 4
-8 - +08
+8 - +08 2018 O 7 4
+11 - +11 2019 Mar 17 3
+8 - +08 2019 O 4 3
+11 - +11 2020 Mar 8 3
+8 - +08 2020 O 4 0:1
+11 - +11
 Z Antarctica/Davis 0 - -00 1957 Ja 13
 7 - +07 1964 N
 0 - -00 1969 F
@@ -440,12 +447,6 @@ Z Antarctica/Mawson 0 - -00 1954 F 13
 5 - +05
 Z Indian/Kerguelen 0 - -00 1950
 5 - +05
-Z Antarctica/DumontDUrville 0 - -00 1947
-10 - +10 1952 Ja 14
-0 - -00 1956 N
-10 - +10
-Z Antarctica/Syowa 0 - -00 1957 Ja 29
-3 - +03
 R Tr 2005 ma - Mar lastSu 1u 2 +02
 R Tr 2004 ma - O lastSu 1u 0 +00
 Z Antarctica/Troll 0 - -00 2005 F 12
@@ -498,6 +499,8 @@ Z Asia/Yangon 6:24:47 - LMT 1880
 6:30 - +0630 1942 May
 9 - +09 1945 May 3
 6:30 - +0630
+R Sh 1919 o - Ap 12 24 1 D
+R Sh 1919 o - S 30 24 0 S
 R Sh 1940 o - Jun 1 0 1 D
 R Sh 1940 o - O 12 24 0 S
 R Sh 1941 o - Mar 15 0 1 D
@@ -775,68 +778,66 @@ 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
@@ -900,8 +901,9 @@ R J 2004 o - O 15 0s 0 -
 R J 2005 o - S lastF 0s 0 -
 R J 2006 2011 - O lastF 0s 0 -
 R J 2013 o - D 20 0 0 -
-R J 2014 ma - Mar lastTh 24 1 S
+R J 2014 2021 - Mar lastTh 24 1 S
 R J 2014 ma - O lastF 0s 0 -
+R J 2022 ma - F lastTh 24 1 S
 Z Asia/Amman 2:23:44 - LMT 1931
 2 J EE%sT
 Z Asia/Almaty 5:7:48 - LMT 1924 May 2
@@ -1089,10 +1091,10 @@ R P 2004 o - O 1 1 0 -
 R P 2005 o - O 4 2 0 -
 R P 2006 2007 - Ap 1 0 1 S
 R P 2006 o - S 22 0 0 -
-R P 2007 o - S Th>=8 2 0 -
+R P 2007 o - S 13 2 0 -
 R P 2008 2009 - Mar lastF 0 1 S
 R P 2008 o - S 1 0 0 -
-R P 2009 o - S F>=1 1 0 -
+R P 2009 o - S 4 1 0 -
 R P 2010 o - Mar 26 0 1 S
 R P 2010 o - Au 11 0 0 -
 R P 2011 o - Ap 1 0:1 1 S
@@ -1101,12 +1103,16 @@ R P 2011 o - Au 30 0 1 S
 R P 2011 o - S 30 0 0 -
 R P 2012 2014 - Mar lastTh 24 1 S
 R P 2012 o - S 21 1 0 -
-R P 2013 o - S F>=21 0 0 -
-R P 2014 2015 - O F>=21 0 0 -
-R P 2015 o - Mar lastF 24 1 S
+R P 2013 o - S 27 0 0 -
+R P 2014 o - O 24 0 0 -
+R P 2015 o - Mar 28 0 1 S
+R P 2015 o - O 23 1 0 -
 R P 2016 2018 - Mar Sa>=24 1 1 S
-R P 2016 ma - O lastSa 1 0 -
-R P 2019 ma - Mar lastF 0 1 S
+R P 2016 2018 - O Sa>=24 1 0 -
+R P 2019 o - Mar 29 0 1 S
+R P 2019 o - O Sa>=24 0 0 -
+R P 2020 ma - Mar Sa>=24 0 1 S
+R P 2020 ma - O Sa>=24 1 0 -
 Z Asia/Gaza 2:17:52 - LMT 1900 O
 2 Z EET/EEST 1948 May 15
 2 K EE%sT 1967 Jun 5
@@ -1142,6 +1148,7 @@ Z Asia/Qatar 3:26:8 - LMT 1920
 L Asia/Qatar Asia/Bahrain
 Z Asia/Riyadh 3:6:52 - LMT 1947 Mar 14
 3 - +03
+L Asia/Riyadh Antarctica/Syowa
 L Asia/Riyadh Asia/Aden
 L Asia/Riyadh Asia/Kuwait
 Z Asia/Singapore 6:55:25 - LMT 1901
@@ -1245,13 +1252,13 @@ 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
@@ -1302,8 +1309,12 @@ 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
@@ -1322,15 +1333,9 @@ 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
@@ -1397,8 +1402,9 @@ Z Antarctica/Macquarie 0 - -00 1899 N
 10 AU AE%sT 1919 Ap 1 0s
 0 - -00 1948 Mar 25
 10 AU AE%sT 1967
-10 AT AE%sT 2010 Ap 4 3
-11 - +11
+10 AT AE%sT 2010
+10 1 AEDT 2011
+10 AT AE%sT
 Z Indian/Christmas 7:2:52 - LMT 1895 F
 7 - +07
 Z Indian/Cocos 6:27:40 - LMT 1900
@@ -1413,7 +1419,9 @@ R FJ 2012 2013 - Ja Su>=18 3 0 -
 R FJ 2014 o - Ja Su>=18 2 0 -
 R FJ 2014 2018 - N Su>=1 2 1 -
 R FJ 2015 ma - Ja Su>=12 3 0 -
-R FJ 2019 ma - N Su>=8 2 1 -
+R FJ 2019 o - N Su>=8 2 1 -
+R FJ 2020 o - D 20 2 1 -
+R FJ 2021 ma - N Su>=8 2 1 -
 Z Pacific/Fiji 11:55:44 - LMT 1915 O 26
 12 FJ +12/+13
 Z Pacific/Gambier -8:59:48 - LMT 1912 O
@@ -1445,7 +1453,7 @@ Z Pacific/Guam -14:21 - LMT 1844 D 31
 L Pacific/Guam Pacific/Saipan
 Z Pacific/Tarawa 11:32:4 - LMT 1901
 12 - +12
-Z Pacific/Enderbury -11:24:20 - LMT 1901
+Z Pacific/Kanton 0 - -00 1937 Au 31
 -12 - -12 1979 O
 -11 - -11 1994 D 31
 13 - +13
@@ -1539,12 +1547,12 @@ L Pacific/Auckland Antarctica/McMurdo
 R CK 1978 o - N 12 0 0:30 -
 R CK 1979 1991 - Mar Su>=1 0 0 -
 R CK 1979 1990 - O lastSu 0 0:30 -
-Z Pacific/Rarotonga -10:39:4 - LMT 1901
+Z Pacific/Rarotonga 13:20:56 - LMT 1899 D 26
+-10:39:4 - LMT 1952 O 16
 -10:30 - -1030 1978 N 12
 -10 CK -10/-0930
-Z Pacific/Niue -11:19:40 - LMT 1901
--11:20 - -1120 1951
--11:30 - -1130 1978 O
+Z Pacific/Niue -11:19:40 - LMT 1952 O 16
+-11:20 - -1120 1964 Jul
 -11 - -11
 Z Pacific/Norfolk 11:11:52 - LMT 1901
 11:12 - +1112 1951
@@ -1559,6 +1567,7 @@ Z Pacific/Palau -15:2:4 - LMT 1844 D 31
 Z Pacific/Port_Moresby 9:48:40 - LMT 1880
 9:48:32 - PMMT 1895
 10 - +10
+L Pacific/Port_Moresby Antarctica/DumontDUrville
 Z Pacific/Bougainville 10:22:16 - LMT 1880
 9:48:32 - PMMT 1895
 10 - +10 1942 Jul
@@ -1575,8 +1584,8 @@ L Pacific/Pago_Pago Pacific/Midway
 R WS 2010 o - S lastSu 0 1 -
 R WS 2011 o - Ap Sa>=1 4 0 -
 R WS 2011 o - S lastSa 3 1 -
-R WS 2012 ma - Ap Su>=1 4 0 -
-R WS 2012 ma - S lastSu 3 1 -
+R WS 2012 2021 - Ap Su>=1 4 0 -
+R WS 2012 2020 - S lastSu 3 1 -
 Z Pacific/Apia 12:33:4 - LMT 1892 Jul 5
 -11:26:56 - LMT 1911
 -11:30 - -1130 1950
@@ -1593,20 +1602,20 @@ R TO 2000 2001 - N Su>=1 2 1 -
 R TO 2001 2002 - Ja lastSu 2 0 -
 R TO 2016 o - N Su>=1 2 1 -
 R TO 2017 o - Ja Su>=15 3 0 -
-Z Pacific/Tongatapu 12:19:20 - LMT 1901
-12:20 - +1220 1941
+Z Pacific/Tongatapu 12:19:12 - LMT 1945 S 10
+12:20 - +1220 1961
 13 - +13 1999
 13 TO +13/+14
 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
@@ -1921,7 +1930,7 @@ Z America/Scoresbysund -1:27:52 - LMT 1916 Jul 28
 -2 - -02 1980 Ap 6 2
 -2 c -02/-01 1981 Mar 29
 -1 E -01/+00
-Z America/Godthab -3:26:56 - LMT 1916 Jul 28
+Z America/Nuuk -3:26:56 - LMT 1916 Jul 28
 -3 - -03 1980 Ap 6 2
 -3 E -03/-02
 Z America/Thule -4:35:8 - LMT 1916 Jul 28
@@ -1990,8 +1999,8 @@ R F 1945 o - Ap 2 2 2 M
 R F 1945 o - S 16 3 0 -
 R F 1976 o - Mar 28 1 1 S
 R F 1976 o - S 26 1 0 -
-Z Europe/Paris 0:9:21 - LMT 1891 Mar 15 0:1
-0:9:21 - PMT 1911 Mar 11 0:1
+Z Europe/Paris 0:9:21 - LMT 1891 Mar 16
+0:9:21 - PMT 1911 Mar 11
 0 F WE%sT 1940 Jun 14 23
 1 c CE%sT 1944 Au 25
 0 F WE%sT 1945 S 16 3
@@ -2043,29 +2052,30 @@ Z Europe/Athens 1:34:52 - LMT 1895 S 14
 1 g CE%sT 1944 Ap 4
 2 g EE%sT 1981
 2 E EE%sT
-R h 1918 o - Ap 1 3 1 S
-R h 1918 o - S 16 3 0 -
-R h 1919 o - Ap 15 3 1 S
-R h 1919 o - N 24 3 0 -
+R h 1918 1919 - Ap 15 2 1 S
+R h 1918 1920 - S M>=15 3 0 -
+R h 1920 o - Ap 5 2 1 S
 R h 1945 o - May 1 23 1 S
-R h 1945 o - N 1 0 0 -
+R h 1945 o - N 1 1 0 -
 R h 1946 o - Mar 31 2s 1 S
-R h 1946 1949 - O Su>=1 2s 0 -
+R h 1946 o - O 7 2 0 -
 R h 1947 1949 - Ap Su>=4 2s 1 S
-R h 1950 o - Ap 17 2s 1 S
-R h 1950 o - O 23 2s 0 -
-R h 1954 1955 - May 23 0 1 S
-R h 1954 1955 - O 3 0 0 -
-R h 1956 o - Jun Su>=1 0 1 S
-R h 1956 o - S lastSu 0 0 -
-R h 1957 o - Jun Su>=1 1 1 S
-R h 1957 o - S lastSu 3 0 -
-R h 1980 o - Ap 6 1 1 S
-Z Europe/Budapest 1:16:20 - LMT 1890 O
+R h 1947 1949 - O Su>=1 2s 0 -
+R h 1954 o - May 23 0 1 S
+R h 1954 o - O 3 0 0 -
+R h 1955 o - May 22 2 1 S
+R h 1955 o - O 2 3 0 -
+R h 1956 1957 - Jun Su>=1 2 1 S
+R h 1956 1957 - S lastSu 3 0 -
+R h 1980 o - Ap 6 0 1 S
+R h 1980 o - S 28 1 0 -
+R h 1981 1983 - Mar lastSu 0 1 S
+R h 1981 1983 - S lastSu 1 0 -
+Z Europe/Budapest 1:16:20 - LMT 1890 N
 1 c CE%sT 1918
-1 h CE%sT 1941 Ap 8
+1 h CE%sT 1941 Ap 7 23
 1 c CE%sT 1945
-1 h CE%sT 1980 S 28 2s
+1 h CE%sT 1984
 1 E CE%sT
 R w 1917 1919 - F 19 23 1 -
 R w 1917 o - O 21 1 0 -
@@ -2221,8 +2231,8 @@ Z Europe/Chisinau 1:55:20 - LMT 1880
 2 R EE%sT 1992
 2 e EE%sT 1997
 2 MD EE%sT
-Z Europe/Monaco 0:29:32 - LMT 1891 Mar 15
-0:9:21 - PMT 1911 Mar 11
+Z Europe/Monaco 0:29:32 - LMT 1892 Jun
+0:9:21 - PMT 1911 Mar 29
 0 F WE%sT 1945 S 16 3
 1 F CE%sT 1977
 1 E CE%sT
@@ -2332,10 +2342,8 @@ R p 1943 1945 - Au Sa>=25 22s 1 S
 R p 1944 1945 - Ap Sa>=21 22s 2 M
 R p 1946 o - Ap Sa>=1 23s 1 S
 R p 1946 o - O Sa>=1 23s 0 -
-R p 1947 1949 - Ap Su>=1 2s 1 S
-R p 1947 1949 - O Su>=1 2s 0 -
-R p 1951 1965 - Ap Su>=1 2s 1 S
-R p 1951 1965 - O Su>=1 2s 0 -
+R p 1947 1965 - Ap Su>=1 2s 1 S
+R p 1947 1965 - O Su>=1 2s 0 -
 R p 1977 o - Mar 27 0s 1 S
 R p 1977 o - S 25 0s 0 -
 R p 1978 1979 - Ap Su>=1 0s 1 S
@@ -2448,7 +2456,8 @@ 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
@@ -2944,6 +2953,7 @@ Z America/Phoenix -7:28:18 - LMT 1883 N 18 11:31:42
 -7 - MST 1967
 -7 u M%sT 1968 Mar 21
 -7 - MST
+L America/Phoenix America/Creston
 Z America/Boise -7:44:49 - LMT 1883 N 18 12:15:11
 -8 u P%sT 1923 May 13 2
 -7 u M%sT 1974
@@ -3214,9 +3224,6 @@ Z America/Moncton -4:19:8 - LMT 1883 D 9
 -4 C A%sT 1993
 -4 o A%sT 2007
 -4 C A%sT
-Z America/Blanc-Sablon -3:48:28 - LMT 1884
--4 C A%sT 1970
--4 - AST
 R t 1919 o - Mar 30 23:30 1 D
 R t 1919 o - O 26 0 0 S
 R t 1920 o - May 2 2 1 D
@@ -3245,6 +3252,7 @@ Z America/Toronto -5:17:32 - LMT 1895
 -5 C E%sT 1946
 -5 t E%sT 1974
 -5 C E%sT
+L America/Toronto America/Nassau
 Z America/Thunder_Bay -5:57 - LMT 1895
 -6 - CST 1910
 -5 - EST 1942
@@ -3260,11 +3268,6 @@ Z America/Rainy_River -6:18:16 - LMT 1895
 -6 C C%sT 1940 S 29
 -6 1 CDT 1942 F 9 2s
 -6 C C%sT
-Z America/Atikokan -6:6:28 - LMT 1895
--6 C C%sT 1940 S 29
--6 1 CDT 1942 F 9 2s
--6 C C%sT 1945 S 30 2
--5 - EST
 R W 1916 o - Ap 23 0 1 D
 R W 1916 o - S 17 0 0 S
 R W 1918 o - Ap 14 2 1 D
@@ -3360,10 +3363,6 @@ Z America/Fort_Nelson -8:10:47 - LMT 1884
 -8 Va P%sT 1987
 -8 C P%sT 2015 Mar 8 2
 -7 - MST
-Z America/Creston -7:46:4 - LMT 1884
--7 - MST 1916 O
--8 - PST 1918 Jun 2
--7 - MST
 R Y 1918 o - Ap 14 2 1 D
 R Y 1918 o - O 27 2 0 S
 R Y 1919 o - May 25 2 1 D
@@ -3411,11 +3410,13 @@ Z America/Inuvik 0 - -00 1953
 Z America/Whitehorse -9:0:12 - LMT 1900 Au 20
 -9 Y Y%sT 1967 May 28
 -8 Y P%sT 1980
--8 C P%sT
+-8 C P%sT 2020 N
+-7 - MST
 Z America/Dawson -9:17:40 - LMT 1900 Au 20
 -9 Y Y%sT 1973 O 28
 -8 Y P%sT 1980
--8 C P%sT
+-8 C P%sT 2020 N
+-7 - MST
 R m 1939 o - F 5 0 1 D
 R m 1939 o - Jun 25 0 0 S
 R m 1940 o - D 9 0 1 D
@@ -3529,29 +3530,53 @@ 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 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
--5 BS E%sT 1976
--5 u E%sT
+R BB 1942 o - Ap 19 5u 1 D
+R BB 1942 o - Au 31 6u 0 S
+R BB 1943 o - May 2 5u 1 D
+R BB 1943 o - S 5 6u 0 S
+R BB 1944 o - Ap 10 5u 0:30 -
+R BB 1944 o - S 10 6u 0 S
 R BB 1977 o - Jun 12 2 1 D
 R BB 1977 1978 - O Su>=1 2 0 S
 R BB 1978 1980 - Ap Su>=15 2 1 D
 R BB 1979 o - S 30 2 0 S
 R BB 1980 o - S 25 2 0 S
-Z America/Barbados -3:58:29 - LMT 1924
--3:58:29 - BMT 1932
+Z America/Barbados -3:58:29 - LMT 1911 Au 28
+-4 BB A%sT 1944
+-4 BB AST/-0330 1945
 -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
@@ -3678,11 +3703,31 @@ Z America/Managua -5:45:8 - LMT 1890
 Z America/Panama -5:18:8 - LMT 1890
 -5:19:36 - CMT 1908 Ap 22
 -5 - EST
+L America/Panama America/Atikokan
 L America/Panama America/Cayman
 Z America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12
 -4 - AST 1942 May 3
 -4 u A%sT 1946
 -4 - AST
+L America/Puerto_Rico America/Anguilla
+L America/Puerto_Rico America/Antigua
+L America/Puerto_Rico America/Aruba
+L America/Puerto_Rico America/Curacao
+L America/Puerto_Rico America/Blanc-Sablon
+L America/Puerto_Rico America/Dominica
+L America/Puerto_Rico America/Grenada
+L America/Puerto_Rico America/Guadeloupe
+L America/Puerto_Rico America/Kralendijk
+L America/Puerto_Rico America/Lower_Princes
+L America/Puerto_Rico America/Marigot
+L America/Puerto_Rico America/Montserrat
+L America/Puerto_Rico America/Port_of_Spain
+L America/Puerto_Rico America/St_Barthelemy
+L America/Puerto_Rico America/St_Kitts
+L America/Puerto_Rico America/St_Lucia
+L America/Puerto_Rico America/St_Thomas
+L America/Puerto_Rico America/St_Vincent
+L America/Puerto_Rico America/Tortola
 Z America/Miquelon -3:44:40 - LMT 1911 May 15
 -4 - AST 1980 May
 -3 - -03 1987
@@ -3690,7 +3735,7 @@ 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 -
@@ -3862,7 +3907,6 @@ Z America/Argentina/Ushuaia -4:33:12 - LMT 1894 O 31
 -4 - -04 2004 Jun 20
 -3 A -03/-02 2008 O 18
 -3 - -03
-L America/Curacao America/Aruba
 Z America/La_Paz -4:32:36 - LMT 1890
 -4:32:36 - CMT 1931 O 15
 -4:32:36 1 BST 1932 Mar 21
@@ -4083,11 +4127,6 @@ R CO 1993 o - Ap 4 0 0 -
 Z America/Bogota -4:56:16 - LMT 1884 Mar 13
 -4:56:16 - BMT 1914 N 23
 -5 CO -05/-04
-Z America/Curacao -4:35:47 - LMT 1912 F 12
--4:30 - -0430 1965
--4 - AST
-L America/Curacao America/Lower_Princes
-L America/Curacao America/Kralendijk
 R EC 1992 o - N 28 0 1 -
 R EC 1993 o - F 5 0 0 -
 Z America/Guayaquil -5:19:20 - LMT 1890
@@ -4117,9 +4156,10 @@ Z Atlantic/Stanley -3:51:24 - LMT 1890
 Z America/Cayenne -3:29:20 - LMT 1911 Jul
 -4 - -04 1967 O
 -3 - -03
-Z America/Guyana -3:52:40 - LMT 1915 Mar
--3:45 - -0345 1975 Jul 31
--3 - -03 1991
+Z America/Guyana -3:52:39 - LMT 1911 Au
+-4 - -04 1915 Mar
+-3:45 - -0345 1975 Au
+-3 - -03 1992 Mar 29 1
 -4 - -04
 R y 1975 1988 - O 1 0 1 -
 R y 1975 1978 - Mar 1 0 0 -
@@ -4168,21 +4208,6 @@ Z America/Paramaribo -3:40:40 - LMT 1911
 -3:40:36 - PMT 1945 O
 -3:30 - -0330 1984 O
 -3 - -03
-Z America/Port_of_Spain -4:6:4 - LMT 1912 Mar 2
--4 - AST
-L America/Port_of_Spain America/Anguilla
-L America/Port_of_Spain America/Antigua
-L America/Port_of_Spain America/Dominica
-L America/Port_of_Spain America/Grenada
-L America/Port_of_Spain America/Guadeloupe
-L America/Port_of_Spain America/Marigot
-L America/Port_of_Spain America/Montserrat
-L America/Port_of_Spain America/St_Barthelemy
-L America/Port_of_Spain America/St_Kitts
-L America/Port_of_Spain America/St_Lucia
-L America/Port_of_Spain America/St_Thomas
-L America/Port_of_Spain America/St_Vincent
-L America/Port_of_Spain America/Tortola
 R U 1923 1925 - O 1 0 0:30 -
 R U 1924 1926 - Ap 1 0 0 -
 R U 1933 1938 - O lastSu 0 0:30 -
@@ -4290,10 +4315,11 @@ L America/Argentina/Catamarca America/Argentina/ComodRivadavia
 L America/Adak America/Atka
 L America/Argentina/Buenos_Aires America/Buenos_Aires
 L America/Argentina/Catamarca America/Catamarca
-L America/Atikokan America/Coral_Harbour
+L America/Panama America/Coral_Harbour
 L America/Argentina/Cordoba America/Cordoba
 L America/Tijuana America/Ensenada
 L America/Indiana/Indianapolis America/Fort_Wayne
+L America/Nuuk America/Godthab
 L America/Indiana/Indianapolis America/Indianapolis
 L America/Argentina/Jujuy America/Jujuy
 L America/Indiana/Knox America/Knox_IN
@@ -4304,7 +4330,7 @@ L America/Rio_Branco America/Porto_Acre
 L America/Argentina/Cordoba America/Rosario
 L America/Tijuana America/Santa_Isabel
 L America/Denver America/Shiprock
-L America/Port_of_Spain America/Virgin
+L America/Puerto_Rico America/Virgin
 L Pacific/Auckland Antarctica/South_Pole
 L Asia/Ashgabat Asia/Ashkhabad
 L Asia/Kolkata Asia/Calcutta
@@ -4325,6 +4351,7 @@ 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
@@ -4375,6 +4402,7 @@ L Pacific/Auckland NZ
 L Pacific/Chatham NZ-CHAT
 L America/Denver Navajo
 L Asia/Shanghai PRC
+L Pacific/Kanton Pacific/Enderbury
 L Pacific/Honolulu Pacific/Johnston
 L Pacific/Pohnpei Pacific/Ponape
 L Pacific/Pago_Pago Pacific/Samoa
diff --git a/lib/pytz/zoneinfo/zone.tab b/lib/pytz/zoneinfo/zone.tab
index 408fcb20..086458fb 100644
--- a/lib/pytz/zoneinfo/zone.tab
+++ b/lib/pytz/zoneinfo/zone.tab
@@ -3,7 +3,7 @@
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 #
-# From Paul Eggert (2018-06-27):
+# From Paul Eggert (2021-09-20):
 # This file is intended as a backward-compatibility aid for older programs.
 # New programs should use zone1970.tab.  This file is like zone1970.tab (see
 # zone1970.tab's comments), but with the following additional restrictions:
@@ -16,6 +16,9 @@
 # clocks have agreed since 1970; this is a narrower definition than
 # that of zone1970.tab.
 #
+# Unlike zone1970.tab, a row's third column can be a Link from
+# 'backward' instead of a Zone.
+#
 # This table is intended as an aid for users, to help them select timezones
 # appropriate for their practical needs.  It is not intended to take or
 # endorse any position on legal or territorial claims.
@@ -56,8 +59,7 @@ AS	-1416-17042	Pacific/Pago_Pago
 AT	+4813+01620	Europe/Vienna
 AU	-3133+15905	Australia/Lord_Howe	Lord Howe Island
 AU	-5430+15857	Antarctica/Macquarie	Macquarie Island
-AU	-4253+14719	Australia/Hobart	Tasmania (most areas)
-AU	-3956+14352	Australia/Currie	Tasmania (King Island)
+AU	-4253+14719	Australia/Hobart	Tasmania
 AU	-3749+14458	Australia/Melbourne	Victoria
 AU	-3352+15113	Australia/Sydney	New South Wales (most areas)
 AU	-3157+14127	Australia/Broken_Hill	New South Wales (Yancowinna)
@@ -130,9 +132,9 @@ CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
 CA	+4906-11631	America/Creston	MST - BC (Creston)
 CA	+5946-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
 CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
+CA	+6043-13503	America/Whitehorse	MST - Yukon (east)
+CA	+6404-13925	America/Dawson	MST - Yukon (west)
 CA	+4916-12307	America/Vancouver	Pacific - BC (most areas)
-CA	+6043-13503	America/Whitehorse	Pacific - Yukon (south)
-CA	+6404-13925	America/Dawson	Pacific - Yukon (north)
 CC	-1210+09655	Indian/Cocos
 CD	-0418+01518	Africa/Kinshasa	Dem. Rep. of Congo (west)
 CD	-1140+02728	Africa/Lubumbashi	Dem. Rep. of Congo (east)
@@ -189,7 +191,7 @@ GF	+0456-05220	America/Cayenne
 GG	+492717-0023210	Europe/Guernsey
 GH	+0533-00013	Africa/Accra
 GI	+3608-00521	Europe/Gibraltar
-GL	+6411-05144	America/Godthab	Greenland (most areas)
+GL	+6411-05144	America/Nuuk	Greenland (most areas)
 GL	+7646-01840	America/Danmarkshavn	National Park (east coast)
 GL	+7029-02158	America/Scoresbysund	Scoresbysund/Ittoqqortoormiit
 GL	+7634-06847	America/Thule	Thule/Pituffik
@@ -229,7 +231,7 @@ KE	-0117+03649	Africa/Nairobi
 KG	+4254+07436	Asia/Bishkek
 KH	+1133+10455	Asia/Phnom_Penh
 KI	+0125+17300	Pacific/Tarawa	Gilbert Islands
-KI	-0308-17105	Pacific/Enderbury	Phoenix Islands
+KI	-0247-17143	Pacific/Kanton	Phoenix Islands
 KI	+0152-15720	Pacific/Kiritimati	Line Islands
 KM	-1141+04316	Indian/Comoro
 KN	+1718-06243	America/St_Kitts
@@ -335,10 +337,10 @@ RU	+554521+0373704	Europe/Moscow	MSK+00 - Moscow area
 # The obsolescent zone.tab format cannot represent Europe/Simferopol well.
 # Put it in RU section and list as UA.  See "territorial claims" above.
 # Programs should use zone1970.tab instead; see above.
-UA	+4457+03406	Europe/Simferopol	MSK+00 - Crimea
+UA	+4457+03406	Europe/Simferopol	Crimea
 RU	+5836+04939	Europe/Kirov	MSK+00 - Kirov
+RU	+4844+04425	Europe/Volgograd	MSK+00 - Volgograd
 RU	+4621+04803	Europe/Astrakhan	MSK+01 - Astrakhan
-RU	+4844+04425	Europe/Volgograd	MSK+01 - Volgograd
 RU	+5134+04602	Europe/Saratov	MSK+01 - Saratov
 RU	+5420+04824	Europe/Ulyanovsk	MSK+01 - Ulyanovsk
 RU	+5312+05009	Europe/Samara	MSK+01 - Samara, Udmurtia
@@ -392,15 +394,15 @@ TK	-0922-17114	Pacific/Fakaofo
 TL	-0833+12535	Asia/Dili
 TM	+3757+05823	Asia/Ashgabat
 TN	+3648+01011	Africa/Tunis
-TO	-2110-17510	Pacific/Tongatapu
+TO	-210800-1751200	Pacific/Tongatapu
 TR	+4101+02858	Europe/Istanbul
 TT	+1039-06131	America/Port_of_Spain
 TV	-0831+17913	Pacific/Funafuti
 TW	+2503+12130	Asia/Taipei
 TZ	-0648+03917	Africa/Dar_es_Salaam
 UA	+5026+03031	Europe/Kiev	Ukraine (most areas)
-UA	+4837+02218	Europe/Uzhgorod	Ruthenia
-UA	+4750+03510	Europe/Zaporozhye	Zaporozh'ye/Zaporizhia; Lugansk/Luhansk (east)
+UA	+4837+02218	Europe/Uzhgorod	Transcarpathia
+UA	+4750+03510	Europe/Zaporozhye	Zaporozhye and east Lugansk
 UG	+0019+03225	Africa/Kampala
 UM	+2813-17722	Pacific/Midway	Midway Islands
 UM	+1917+16637	Pacific/Wake	Wake Island
diff --git a/lib/pytz/zoneinfo/zone1970.tab b/lib/pytz/zoneinfo/zone1970.tab
index 822ffa1f..c614be81 100644
--- a/lib/pytz/zoneinfo/zone1970.tab
+++ b/lib/pytz/zoneinfo/zone1970.tab
@@ -40,11 +40,9 @@ AL	+4120+01950	Europe/Tirane
 AM	+4011+04430	Asia/Yerevan
 AQ	-6617+11031	Antarctica/Casey	Casey
 AQ	-6835+07758	Antarctica/Davis	Davis
-AQ	-6640+14001	Antarctica/DumontDUrville	Dumont-d'Urville
 AQ	-6736+06253	Antarctica/Mawson	Mawson
 AQ	-6448-06406	Antarctica/Palmer	Palmer
 AQ	-6734-06808	Antarctica/Rothera	Rothera
-AQ	-690022+0393524	Antarctica/Syowa	Syowa
 AQ	-720041+0023206	Antarctica/Troll	Troll
 AQ	-7824+10654	Antarctica/Vostok	Vostok
 AR	-3436-05827	America/Argentina/Buenos_Aires	Buenos Aires (BA, CF)
@@ -63,8 +61,7 @@ AS,UM	-1416-17042	Pacific/Pago_Pago	Samoa, Midway
 AT	+4813+01620	Europe/Vienna
 AU	-3133+15905	Australia/Lord_Howe	Lord Howe Island
 AU	-5430+15857	Antarctica/Macquarie	Macquarie Island
-AU	-4253+14719	Australia/Hobart	Tasmania (most areas)
-AU	-3956+14352	Australia/Currie	Tasmania (King Island)
+AU	-4253+14719	Australia/Hobart	Tasmania
 AU	-3749+14458	Australia/Melbourne	Victoria
 AU	-3352+15113	Australia/Sydney	New South Wales (most areas)
 AU	-3157+14127	Australia/Broken_Hill	New South Wales (Yancowinna)
@@ -98,7 +95,6 @@ BR	+0249-06040	America/Boa_Vista	Roraima
 BR	-0308-06001	America/Manaus	Amazonas (east)
 BR	-0640-06952	America/Eirunepe	Amazonas (west)
 BR	-0958-06748	America/Rio_Branco	Acre
-BS	+2505-07721	America/Nassau
 BT	+2728+08939	Asia/Thimphu
 BY	+5354+02734	Europe/Minsk
 BZ	+1730-08812	America/Belize
@@ -107,13 +103,11 @@ CA	+4439-06336	America/Halifax	Atlantic - NS (most areas); PE
 CA	+4612-05957	America/Glace_Bay	Atlantic - NS (Cape Breton)
 CA	+4606-06447	America/Moncton	Atlantic - New Brunswick
 CA	+5320-06025	America/Goose_Bay	Atlantic - Labrador (most areas)
-CA	+5125-05707	America/Blanc-Sablon	AST - QC (Lower North Shore)
-CA	+4339-07923	America/Toronto	Eastern - ON, QC (most areas)
+CA,BS	+4339-07923	America/Toronto	Eastern - ON, QC (most areas), Bahamas
 CA	+4901-08816	America/Nipigon	Eastern - ON, QC (no DST 1967-73)
 CA	+4823-08915	America/Thunder_Bay	Eastern - ON (Thunder Bay)
 CA	+6344-06828	America/Iqaluit	Eastern - NU (most east areas)
 CA	+6608-06544	America/Pangnirtung	Eastern - NU (Pangnirtung)
-CA	+484531-0913718	America/Atikokan	EST - ON (Atikokan); NU (Coral H)
 CA	+4953-09709	America/Winnipeg	Central - ON (west); Manitoba
 CA	+4843-09434	America/Rainy_River	Central - ON (Rainy R, Ft Frances)
 CA	+744144-0944945	America/Resolute	Central - NU (Resolute)
@@ -124,15 +118,14 @@ CA	+5333-11328	America/Edmonton	Mountain - AB; BC (E); SK (W)
 CA	+690650-1050310	America/Cambridge_Bay	Mountain - NU (west)
 CA	+6227-11421	America/Yellowknife	Mountain - NT (central)
 CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
-CA	+4906-11631	America/Creston	MST - BC (Creston)
 CA	+5946-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
 CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
+CA	+6043-13503	America/Whitehorse	MST - Yukon (east)
+CA	+6404-13925	America/Dawson	MST - Yukon (west)
 CA	+4916-12307	America/Vancouver	Pacific - BC (most areas)
-CA	+6043-13503	America/Whitehorse	Pacific - Yukon (south)
-CA	+6404-13925	America/Dawson	Pacific - Yukon (north)
 CC	-1210+09655	Indian/Cocos
 CH,DE,LI	+4723+00832	Europe/Zurich	Swiss time
-CI,BF,GM,GN,ML,MR,SH,SL,SN,TG	+0519-00402	Africa/Abidjan
+CI,BF,GH,GM,GN,ML,MR,SH,SL,SN,TG	+0519-00402	Africa/Abidjan
 CK	-2114-15946	Pacific/Rarotonga
 CL	-3327-07040	America/Santiago	Chile (most areas)
 CL	-5309-07055	America/Punta_Arenas	Region of Magallanes
@@ -143,7 +136,6 @@ CO	+0436-07405	America/Bogota
 CR	+0956-08405	America/Costa_Rica
 CU	+2308-08222	America/Havana
 CV	+1455-02331	Atlantic/Cape_Verde
-CW,AW,BQ,SX	+1211-06900	America/Curacao
 CX	-1025+10543	Indian/Christmas
 CY	+3510+03322	Asia/Nicosia	Cyprus (most areas)
 CY	+3507+03357	Asia/Famagusta	Northern Cyprus
@@ -171,9 +163,8 @@ FR	+4852+00220	Europe/Paris
 GB,GG,IM,JE	+513030-0000731	Europe/London
 GE	+4143+04449	Asia/Tbilisi
 GF	+0456-05220	America/Cayenne
-GH	+0533-00013	Africa/Accra
 GI	+3608-00521	Europe/Gibraltar
-GL	+6411-05144	America/Godthab	Greenland (most areas)
+GL	+6411-05144	America/Nuuk	Greenland (most areas)
 GL	+7646-01840	America/Danmarkshavn	National Park (east coast)
 GL	+7029-02158	America/Scoresbysund	Scoresbysund/Ittoqqortoormiit
 GL	+7634-06847	America/Thule	Thule/Pituffik
@@ -205,7 +196,7 @@ JP	+353916+1394441	Asia/Tokyo
 KE,DJ,ER,ET,KM,MG,SO,TZ,UG,YT	-0117+03649	Africa/Nairobi
 KG	+4254+07436	Asia/Bishkek
 KI	+0125+17300	Pacific/Tarawa	Gilbert Islands
-KI	-0308-17105	Pacific/Enderbury	Phoenix Islands
+KI	-0247-17143	Pacific/Kanton	Phoenix Islands
 KI	+0152-15720	Pacific/Kiritimati	Line Islands
 KP	+3901+12545	Asia/Pyongyang
 KR	+3733+12658	Asia/Seoul
@@ -263,19 +254,19 @@ NR	-0031+16655	Pacific/Nauru
 NU	-1901-16955	Pacific/Niue
 NZ,AQ	-3652+17446	Pacific/Auckland	New Zealand time
 NZ	-4357-17633	Pacific/Chatham	Chatham Islands
-PA,KY	+0858-07932	America/Panama
+PA,CA,KY	+0858-07932	America/Panama	EST - Panama, Cayman, ON (Atikokan), NU (Coral H)
 PE	-1203-07703	America/Lima
 PF	-1732-14934	Pacific/Tahiti	Society Islands
 PF	-0900-13930	Pacific/Marquesas	Marquesas Islands
 PF	-2308-13457	Pacific/Gambier	Gambier Islands
-PG	-0930+14710	Pacific/Port_Moresby	Papua New Guinea (most areas)
+PG,AQ	-0930+14710	Pacific/Port_Moresby	Papua New Guinea (most areas), Dumont d'Urville
 PG	-0613+15534	Pacific/Bougainville	Bougainville
 PH	+1435+12100	Asia/Manila
 PK	+2452+06703	Asia/Karachi
 PL	+5215+02100	Europe/Warsaw
 PM	+4703-05620	America/Miquelon
 PN	-2504-13005	Pacific/Pitcairn
-PR	+182806-0660622	America/Puerto_Rico
+PR,AG,CA,AI,AW,BL,BQ,CW,DM,GD,GP,KN,LC,MF,MS,SX,TT,VC,VG,VI	+182806-0660622	America/Puerto_Rico	AST
 PS	+3130+03428	Asia/Gaza	Gaza Strip
 PS	+313200+0350542	Asia/Hebron	West Bank
 PT	+3843-00908	Europe/Lisbon	Portugal (mainland)
@@ -290,10 +281,10 @@ RS,BA,HR,ME,MK,SI	+4450+02030	Europe/Belgrade
 RU	+5443+02030	Europe/Kaliningrad	MSK-01 - Kaliningrad
 RU	+554521+0373704	Europe/Moscow	MSK+00 - Moscow area
 # Mention RU and UA alphabetically.  See "territorial claims" above.
-RU,UA	+4457+03406	Europe/Simferopol	MSK+00 - Crimea
+RU,UA	+4457+03406	Europe/Simferopol	Crimea
 RU	+5836+04939	Europe/Kirov	MSK+00 - Kirov
+RU	+4844+04425	Europe/Volgograd	MSK+00 - Volgograd
 RU	+4621+04803	Europe/Astrakhan	MSK+01 - Astrakhan
-RU	+4844+04425	Europe/Volgograd	MSK+01 - Volgograd
 RU	+5134+04602	Europe/Saratov	MSK+01 - Saratov
 RU	+5420+04824	Europe/Ulyanovsk	MSK+01 - Ulyanovsk
 RU	+5312+05009	Europe/Samara	MSK+01 - Samara, Udmurtia
@@ -315,12 +306,12 @@ RU	+4658+14242	Asia/Sakhalin	MSK+08 - Sakhalin Island
 RU	+6728+15343	Asia/Srednekolymsk	MSK+08 - Sakha (E); North Kuril Is
 RU	+5301+15839	Asia/Kamchatka	MSK+09 - Kamchatka
 RU	+6445+17729	Asia/Anadyr	MSK+09 - Bering Sea
-SA,KW,YE	+2438+04643	Asia/Riyadh
+SA,AQ,KW,YE	+2438+04643	Asia/Riyadh	Arabia, Syowa
 SB	-0932+16012	Pacific/Guadalcanal
 SC	-0440+05528	Indian/Mahe
 SD	+1536+03232	Africa/Khartoum
 SE	+5920+01803	Europe/Stockholm
-SG	+0117+10351	Asia/Singapore
+SG,MY	+0117+10351	Asia/Singapore	Singapore, peninsular Malaysia
 SR	+0550-05510	America/Paramaribo
 SS	+0451+03137	Africa/Juba
 ST	+0020+00644	Africa/Sao_Tome
@@ -335,14 +326,13 @@ TK	-0922-17114	Pacific/Fakaofo
 TL	-0833+12535	Asia/Dili
 TM	+3757+05823	Asia/Ashgabat
 TN	+3648+01011	Africa/Tunis
-TO	-2110-17510	Pacific/Tongatapu
+TO	-210800-1751200	Pacific/Tongatapu
 TR	+4101+02858	Europe/Istanbul
-TT,AG,AI,BL,DM,GD,GP,KN,LC,MF,MS,VC,VG,VI	+1039-06131	America/Port_of_Spain
 TV	-0831+17913	Pacific/Funafuti
 TW	+2503+12130	Asia/Taipei
 UA	+5026+03031	Europe/Kiev	Ukraine (most areas)
-UA	+4837+02218	Europe/Uzhgorod	Ruthenia
-UA	+4750+03510	Europe/Zaporozhye	Zaporozh'ye/Zaporizhia; Lugansk/Luhansk (east)
+UA	+4837+02218	Europe/Uzhgorod	Transcarpathia
+UA	+4750+03510	Europe/Zaporozhye	Zaporozhye and east Lugansk
 UM	+1917+16637	Pacific/Wake	Wake Island
 US	+404251-0740023	America/New_York	Eastern (most areas)
 US	+421953-0830245	America/Detroit	Eastern - MI (most areas)
@@ -363,7 +353,7 @@ US	+465042-1012439	America/North_Dakota/New_Salem	Central - ND (Morton rural)
 US	+471551-1014640	America/North_Dakota/Beulah	Central - ND (Mercer)
 US	+394421-1045903	America/Denver	Mountain (most areas)
 US	+433649-1161209	America/Boise	Mountain - ID (south); OR (east)
-US	+332654-1120424	America/Phoenix	MST - Arizona (except Navajo)
+US,CA	+332654-1120424	America/Phoenix	MST - Arizona (except Navajo), Creston BC
 US	+340308-1181434	America/Los_Angeles	Pacific
 US	+611305-1495401	America/Anchorage	Alaska (most areas)
 US	+581807-1342511	America/Juneau	Alaska - Juneau area