Update tzdata to version 2026c (#145)

github-actions[bot] · StanFromIreland · web-flow · commit a44279419071 · 2026-07-10T10:41:12.000+02:00
# Version 2026.3

Upstream version 2026c released 2026-07-08T17:23:58+00:00

## Briefly:

Alberta moved to permanent -06 on 2026-06-18. Morocco moves to permanent +00 on
2026-09-20. More integer overflow bugs have been fixed in zic.

## Changes to future timestamps

Alberta’s 2026-03-08 spring forward was its last foreseeable clock change, as it
moved to permanent -06 thereafter.  (Thanks to Roozbeh Pournader and others.)
Model this with its traditional abbreviation CST.  Although the change to
permanent -06 legally took place on 2026-06-18, temporarily model the change to
occur on 2026-11-01 at 02:00 instead, for the same reason we introduced a
similarly temporary hack for British Columbia in 2026b.

Although another TZDB release will likely be needed soon because Northwest
Territories will likely follow Alberta, the legal formalities have not yet taken
place.

Morocco plans to move back to permanent UTC, without daylight saving time
transitions, on 2026-09-20 at 02:00.  This also affects Western Sahara.

## Changes to commentary

Northwest Territories is expected to move to permanent -06 prior to 2026-11-01
02:00, when clocks would otherwise fall back.  (Thanks to Tim Parenti and James
Bellaire.)  Model this with its traditional abbreviation CST.  Unfortunately the
change is not yet official, so it is currently present only as comments that can
be uncommented as needed.

Co-authored-by: Stan Ulbrych &lt;stan@python.org&gt;
diff --git a/NEWS.md b/NEWS.md
@@ -1,3 +1,37 @@
+# Version 2026.3
+Upstream version 2026c released 2026-07-08T17:23:58+00:00
+
+## Briefly:
+
+Alberta moved to permanent -06 on 2026-06-18. Morocco moves to permanent +00 on
+2026-09-20. More integer overflow bugs have been fixed in zic.
+
+## Changes to future timestamps
+
+Alberta’s 2026-03-08 spring forward was its last foreseeable clock change, as it
+moved to permanent -06 thereafter.  (Thanks to Roozbeh Pournader and others.)
+Model this with its traditional abbreviation CST.  Although the change to
+permanent -06 legally took place on 2026-06-18, temporarily model the change to
+occur on 2026-11-01 at 02:00 instead, for the same reason we introduced a
+similarly temporary hack for British Columbia in 2026b.
+
+Although another TZDB release will likely be needed soon because Northwest
+Territories will likely follow Alberta, the legal formalities have not yet taken
+place.
+
+Morocco plans to move back to permanent UTC, without daylight saving time
+transitions, on 2026-09-20 at 02:00.  This also affects Western Sahara.
+
+## Changes to commentary
+
+Northwest Territories is expected to move to permanent -06 prior to 2026-11-01
+02:00, when clocks would otherwise fall back.  (Thanks to Tim Parenti and James
+Bellaire.)  Model this with its traditional abbreviation CST.  Unfortunately the
+change is not yet official, so it is currently present only as comments that can
+be uncommented as needed.
+
+---
+
 # Version 2026.2
 Upstream version 2026b released 2026-04-23T06:06:43+00:00
 
diff --git a/VERSION b/VERSION
@@ -1 +1 @@
-2026.2
+2026.3
diff --git a/news.d/2026b.md b/news.d/2026b.md
@@ -0,0 +1,16 @@
+# Version 2026.2
+Upstream version 2026b released 2026-04-23T06:06:43+00:00
+
+## Briefly:
+
+British Columbia moved to permanent -07 on 2026-03-09. Some more overflow bugs
+have been fixed in zic.
+
+## Changes to future timestamps
+
+British Columbia’s 2026-03-08 spring forward was its last foreseeable clock
+change, as it moved to permanent -07 thereafter. (Thanks to Arthur David Olson.)
+Although the change to permanent -07 legally took place on 2026-03-09,
+temporarily model the change to occur on 2026-11-01 at 02:00 instead.  This
+works around a limitation in CLDR v48.2 (2026-03-17).  This temporary hack is
+planned to be removed after CLDR is fixed.
diff --git a/news.d/2026c.md b/news.d/2026c.md
@@ -0,0 +1,31 @@
+# Version 2026.3
+Upstream version 2026c released 2026-07-08T17:23:58+00:00
+
+## Briefly:
+
+Alberta moved to permanent -06 on 2026-06-18. Morocco moves to permanent +00 on
+2026-09-20. More integer overflow bugs have been fixed in zic.
+
+## Changes to future timestamps
+
+Alberta’s 2026-03-08 spring forward was its last foreseeable clock change, as it
+moved to permanent -06 thereafter.  (Thanks to Roozbeh Pournader and others.)
+Model this with its traditional abbreviation CST.  Although the change to
+permanent -06 legally took place on 2026-06-18, temporarily model the change to
+occur on 2026-11-01 at 02:00 instead, for the same reason we introduced a
+similarly temporary hack for British Columbia in 2026b.
+
+Although another TZDB release will likely be needed soon because Northwest
+Territories will likely follow Alberta, the legal formalities have not yet taken
+place.
+
+Morocco plans to move back to permanent UTC, without daylight saving time
+transitions, on 2026-09-20 at 02:00.  This also affects Western Sahara.
+
+## Changes to commentary
+
+Northwest Territories is expected to move to permanent -06 prior to 2026-11-01
+02:00, when clocks would otherwise fall back.  (Thanks to Tim Parenti and James
+Bellaire.)  Model this with its traditional abbreviation CST.  Unfortunately the
+change is not yet official, so it is currently present only as comments that can
+be uncommented as needed.
diff --git a/src/tzdata/__init__.py b/src/tzdata/__init__.py
@@ -1,6 +1,6 @@
 # IANA versions like 2020a are not valid PEP 440 identifiers; the recommended
 # way to translate the version is to use YYYY.n where `n` is a 0-based index.
-__version__ = "2026.2"
+__version__ = "2026.3"
 
 # This exposes the original IANA version number.
-IANA_VERSION = "2026b"
+IANA_VERSION = "2026c"
diff --git a/src/tzdata/zoneinfo/Africa/Casablanca b/src/tzdata/zoneinfo/Africa/Casablanca
diff --git a/src/tzdata/zoneinfo/Africa/El_Aaiun b/src/tzdata/zoneinfo/Africa/El_Aaiun
diff --git a/src/tzdata/zoneinfo/America/Edmonton b/src/tzdata/zoneinfo/America/Edmonton
diff --git a/src/tzdata/zoneinfo/America/Yellowknife b/src/tzdata/zoneinfo/America/Yellowknife
diff --git a/src/tzdata/zoneinfo/Canada/Mountain b/src/tzdata/zoneinfo/Canada/Mountain
diff --git a/src/tzdata/zoneinfo/leapseconds b/src/tzdata/zoneinfo/leapseconds
@@ -70,7 +70,7 @@ Leap	2016	Dec	31	23:59:60	+	S
 # 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 2026	Dec	28	00:00:00
+#Expires 2027	Jun	28	00:00:00
 
 # Here are POSIX timestamps for the data in this file.
 # "#updated" gives the last time the leap seconds data changed
@@ -79,8 +79,8 @@ Leap	2016	Dec	31	23:59:60	+	S
 # "#expires" gives the first time this file might be wrong;
 # if this file was derived from the IERS leap-seconds.list,
 # this is typically a bit less than one year after "updated".
-#updated 1767698058 (2026-01-06 11:14:18 UTC)
-#expires 1798416000 (2026-12-28 00:00:00 UTC)
+#updated 1783323897 (2026-07-06 07:44:57 UTC)
+#expires 1814140800 (2027-06-28 00:00:00 UTC)
 
 #	Updated through IERS Bulletin C (https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat)
-#	File expires on 28 December 2026
+#	File expires on 28 June 2027
diff --git a/src/tzdata/zoneinfo/tzdata.zi b/src/tzdata/zoneinfo/tzdata.zi
@@ -1,4 +1,4 @@
-# version 2026b-dirty
+# version 2026c
 # redo posix_only
 # This zic input file is in the public domain.
 R d 1916 o - Jun 14 23s 1 S
@@ -135,132 +135,6 @@ R M 2025 o - F 23 3 -1 -
 R M 2025 o - Ap 6 2 0 -
 R M 2026 o - F 15 3 -1 -
 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 - 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 - D 14 3 -1 -
-R M 2032 o - Ja 18 2 0 -
-R M 2032 o - N 28 3 -1 -
-R M 2033 o - Ja 9 2 0 -
-R M 2033 o - N 20 3 -1 -
-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 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 2039 o - S 18 3 -1 -
-R M 2039 o - O 23 2 0 -
-R M 2040 o - S 2 3 -1 -
-R M 2040 o - O 14 2 0 -
-R M 2041 o - Au 25 3 -1 -
-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 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 2047 o - Jun 23 3 -1 -
-R M 2047 o - Jul 28 2 0 -
-R M 2048 o - Jun 7 3 -1 -
-R M 2048 o - Jul 19 2 0 -
-R M 2049 o - May 30 3 -1 -
-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 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 2055 o - Mar 28 3 -1 -
-R M 2055 o - May 2 2 0 -
-R M 2056 o - Mar 12 3 -1 -
-R M 2056 o - Ap 23 2 0 -
-R M 2057 o - Mar 4 3 -1 -
-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 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 - 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 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 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 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 - 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 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 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 - 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 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 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 11 2 0 -
 R NA 1994 o - Mar 21 0 -1 WAT
 R NA 1994 2017 - S Su>=1 2 0 CAT
 R NA 1995 2017 - Ap Su>=1 2 -1 WAT
@@ -2106,7 +1980,8 @@ Z Africa/Casablanca -0:30:20 - LMT 1913 O 26
 0 M %z 1984 Mar 16
 1 - %z 1986
 0 M %z 2018 O 28 3
-1 M %z
+1 M %z 2026 S 20 2
+0 - %z
 Z Africa/Ceuta -0:21:16 - LMT 1901 Ja 1 0u
 0 - WET 1918 May 6 23
 0 1 WEST 1918 O 7 23
@@ -2119,7 +1994,8 @@ Z Africa/Ceuta -0:21:16 - LMT 1901 Ja 1 0u
 Z Africa/El_Aaiun -0:52:48 - LMT 1934
 -1 - %z 1976 Ap 14
 0 M %z 2018 O 28 3
-1 M %z
+1 M %z 2026 S 20 2
+0 - %z
 Z Africa/Johannesburg 1:52 - LMT 1892 F 8
 1:30 - SAST 1903 Mar
 2 SA SAST
@@ -2483,7 +2359,9 @@ Z America/Detroit -5:32:11 - LMT 1905
 -5 u E%sT
 Z America/Edmonton -7:33:52 - LMT 1906 S
 -7 Ed M%sT 1987
--7 C M%sT
+-7 C M%sT 2026 Jun 18
+-7 1 MDT 2026 N 1 2
+-6 - CST
 Z America/Eirunepe -4:39:28 - LMT 1914
 -5 B %z 1988 S 12
 -5 - %z 1993 S 28
diff --git a/src/tzdata/zoneinfo/zone.tab b/src/tzdata/zoneinfo/zone.tab
@@ -121,7 +121,7 @@ CA	+744144-0944945	America/Resolute	Central - NU (Resolute)
 CA	+624900-0920459	America/Rankin_Inlet	Central - NU (central)
 CA	+5024-10439	America/Regina	CST - SK (most areas)
 CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
-CA	+5333-11328	America/Edmonton	Mountain - AB, BC(E), NT(E), SK(W)
+CA	+5333-11328	America/Edmonton	CST - AB, BC(E), NT(E), SK(W)
 CA	+690650-1050310	America/Cambridge_Bay	Mountain - NU (west)
 CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
 CA	+4916-12307	America/Vancouver	MST - BC (most areas)
diff --git a/src/tzdata/zoneinfo/zone1970.tab b/src/tzdata/zoneinfo/zone1970.tab
@@ -112,7 +112,7 @@ CA	+744144-0944945	America/Resolute	Central - NU (Resolute)
 CA	+624900-0920459	America/Rankin_Inlet	Central - NU (central)
 CA	+5024-10439	America/Regina	CST - SK (most areas)
 CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
-CA	+5333-11328	America/Edmonton	Mountain - AB, BC(E), NT(E), SK(W)
+CA	+5333-11328	America/Edmonton	CST - AB, BC(E), NT(E), SK(W)
 CA	+690650-1050310	America/Cambridge_Bay	Mountain - NU (west)
 CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
 CA	+4916-12307	America/Vancouver	MST - BC (most areas)
diff --git a/src/tzdata/zoneinfo/zonenow.tab b/src/tzdata/zoneinfo/zonenow.tab
@@ -56,16 +56,19 @@ XX	+611305-1495401	America/Anchorage	most of Alaska (AKST/AKDT)
 XX	-2504-13005	Pacific/Pitcairn	Pitcairn
 #
 # -08/-07 - PST/PDT (North America DST)
-XX	+340308-1181434	America/Los_Angeles	Pacific (PST/PDT) - US & Canada; Mexico near US border
+XX	+340308-1181434	America/Los_Angeles	Pacific (PST/PDT) - US; Mexico near US border
 #
 # -08/-07 - PST/PDT (North America DST) until 2026-11-01 02:00; then MST
-XX	+4916-12307	America/Vancouver	MST - BC (most areas)
+XX	+4916-12307	America/Vancouver	Mountain Standard (MST) - British Columbia (most areas)
 #
 # -07 - MST
 XX	+332654-1120424	America/Phoenix	Mountain Standard (MST) - Arizona; western Mexico; Yukon
 #
 # -07/-06 - MST/MDT (North America DST)
-XX	+394421-1045903	America/Denver	Mountain (MST/MDT) - US & Canada; Mexico near US border
+XX	+394421-1045903	America/Denver	Mountain (MST/MDT) - US; Mexico near US border; northern Canada
+#
+# -07/-06 - MST/MDT (North America DST) until 2026-11-01 02:00; then CST
+XX	+5333-11328	America/Edmonton	Central Standard (CST) - Alberta and some neighbors
 #
 # -06
 XX	-0054-08936	Pacific/Galapagos	Galápagos
