From 20c156ab11104faf34805486436230bfacc7224e Mon Sep 17 00:00:00 2001
From: GitHub Action <action@github.com>
Date: Sat, 12 Sep 2026 12:24:53 +0000
Subject: [PATCH 1/2] Update tzdata to version 2026d
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

# Version 2026.4
Upstream version 2026d released 2026-09-11T22:21:07+00:00

## Briefly:

Canada’s Northwest Territories moved to permanent -06 on 2026-08-21. Obsolescent
settings like TZ="EST5EDT" now conform better to POSIX. Fix security,
performance and porting bugs in zic and localtime.

## Changes to future timestamps

Canada’s Northwest Territories will not fall back on 2026-11-01 and will stay on
-06 year-round, matching Alberta’s recent change. Model this with its
traditional abbreviation CST.  Although the change to permanent -06 legally took
place on 2026-08-21, temporarily model the change to occur on 2026-11-01 at
02:00 for the same reason as other recent temporary hacks.  (Caution: see “NOTE
FOR 2026b TEMPORARY HACK FOR CLDR AND CANADA” below.) This affects only
America/Inuvik as the rest of the territory is covered by America/Edmonton, for
which the equivalent change was released in 2026c.

## Changes to past timestamps

Colombia’s 1992-05-02 spring forward was at 00:00, not 24:00.

Iran’s 1979-05-26 spring forward was at 00:00, not 24:00. (Thanks to N.F. Hase.)

The backward-compatibility names EST5EDT, CST6CDT, MST7MDT, and PST8PDT now
conform better to POSIX.  For example, EST5EDT now always uses the abbreviation
"EST" for standard time (now always 5 hours behind UT) and "EDT" for daylight
saving time, whereas it formerly had different UT offsets before standard time
was introduced and sometimes used abbreviations like "LMT", "EWT" and "EPT", all
contrary to POSIX.  Also, though not required by POSIX these names now use US
federal rules rather than rules of places like New York, reverting to 2024a
behavior.  This change affects only timestamps before 1966-10-30 at 01:00
standard time.

## Other data changes

The temporary hacks used for North American timekeeping changes now work around
a libstdc++ std::chrono bug in GCC 14.1-14.4, 15.1-15.2, and 16.1; see GCC bug
124851.  This data change does not affect TZif files or timestamps.  The change
does not work around the related but less serious GCC bugs 116110 and 124513.
These GCC bugs are all fixed in GCC 16.2.

## Changes to documentation

URLs for release tarballs in tz-link.html have been updated to reflect their new
canonical URLs on data.iana.org.
---
 NEWS.md                            |  51 +++++++++++++++++++++++++++++
 VERSION                            |   2 +-
 news.d/2026d.md                    |  48 +++++++++++++++++++++++++++
 src/tzdata/__init__.py             |   4 +--
 src/tzdata/zoneinfo/America/Bogota | Bin 179 -> 179 bytes
 src/tzdata/zoneinfo/America/Inuvik | Bin 817 -> 1160 bytes
 src/tzdata/zoneinfo/Asia/Tehran    | Bin 812 -> 812 bytes
 src/tzdata/zoneinfo/CST6CDT        | Bin 1754 -> 922 bytes
 src/tzdata/zoneinfo/EST5EDT        | Bin 1744 -> 922 bytes
 src/tzdata/zoneinfo/Iran           | Bin 812 -> 812 bytes
 src/tzdata/zoneinfo/MST7MDT        | Bin 1042 -> 922 bytes
 src/tzdata/zoneinfo/PST8PDT        | Bin 1294 -> 922 bytes
 src/tzdata/zoneinfo/tzdata.zi      |  49 +++++++++++++++++----------
 src/tzdata/zoneinfo/zone.tab       |   2 +-
 src/tzdata/zoneinfo/zone1970.tab   |   2 +-
 src/tzdata/zoneinfo/zonenow.tab    |   4 +--
 src/tzdata/zones                   |   8 ++---
 17 files changed, 142 insertions(+), 28 deletions(-)
 create mode 100644 news.d/2026d.md

diff --git a/NEWS.md b/NEWS.md
index eceec9d..cc09203 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,54 @@
+# Version 2026.4
+Upstream version 2026d released 2026-09-11T22:21:07+00:00
+
+## Briefly:
+
+Canada’s Northwest Territories moved to permanent -06 on 2026-08-21. Obsolescent
+settings like TZ="EST5EDT" now conform better to POSIX. Fix security,
+performance and porting bugs in zic and localtime.
+
+## Changes to future timestamps
+
+Canada’s Northwest Territories will not fall back on 2026-11-01 and will stay on
+-06 year-round, matching Alberta’s recent change. Model this with its
+traditional abbreviation CST.  Although the change to permanent -06 legally took
+place on 2026-08-21, temporarily model the change to occur on 2026-11-01 at
+02:00 for the same reason as other recent temporary hacks.  (Caution: see “NOTE
+FOR 2026b TEMPORARY HACK FOR CLDR AND CANADA” below.) This affects only
+America/Inuvik as the rest of the territory is covered by America/Edmonton, for
+which the equivalent change was released in 2026c.
+
+## Changes to past timestamps
+
+Colombia’s 1992-05-02 spring forward was at 00:00, not 24:00.
+
+Iran’s 1979-05-26 spring forward was at 00:00, not 24:00. (Thanks to N.F. Hase.)
+
+The backward-compatibility names EST5EDT, CST6CDT, MST7MDT, and PST8PDT now
+conform better to POSIX.  For example, EST5EDT now always uses the abbreviation
+"EST" for standard time (now always 5 hours behind UT) and "EDT" for daylight
+saving time, whereas it formerly had different UT offsets before standard time
+was introduced and sometimes used abbreviations like "LMT", "EWT" and "EPT", all
+contrary to POSIX.  Also, though not required by POSIX these names now use US
+federal rules rather than rules of places like New York, reverting to 2024a
+behavior.  This change affects only timestamps before 1966-10-30 at 01:00
+standard time.
+
+## Other data changes
+
+The temporary hacks used for North American timekeeping changes now work around
+a libstdc++ std::chrono bug in GCC 14.1-14.4, 15.1-15.2, and 16.1; see GCC bug
+124851.  This data change does not affect TZif files or timestamps.  The change
+does not work around the related but less serious GCC bugs 116110 and 124513.
+These GCC bugs are all fixed in GCC 16.2.
+
+## Changes to documentation
+
+URLs for release tarballs in tz-link.html have been updated to reflect their new
+canonical URLs on data.iana.org.
+
+---
+
 # Version 2026.3
 Upstream version 2026c released 2026-07-08T17:23:58+00:00
 
diff --git a/VERSION b/VERSION
index c82bdf1..f839d75 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2026.3
\ No newline at end of file
+2026.4rc0
\ No newline at end of file
diff --git a/news.d/2026d.md b/news.d/2026d.md
new file mode 100644
index 0000000..3afc15e
--- /dev/null
+++ b/news.d/2026d.md
@@ -0,0 +1,48 @@
+# Version 2026.4
+Upstream version 2026d released 2026-09-11T22:21:07+00:00
+
+## Briefly:
+
+Canada’s Northwest Territories moved to permanent -06 on 2026-08-21. Obsolescent
+settings like TZ="EST5EDT" now conform better to POSIX. Fix security,
+performance and porting bugs in zic and localtime.
+
+## Changes to future timestamps
+
+Canada’s Northwest Territories will not fall back on 2026-11-01 and will stay on
+-06 year-round, matching Alberta’s recent change. Model this with its
+traditional abbreviation CST.  Although the change to permanent -06 legally took
+place on 2026-08-21, temporarily model the change to occur on 2026-11-01 at
+02:00 for the same reason as other recent temporary hacks.  (Caution: see “NOTE
+FOR 2026b TEMPORARY HACK FOR CLDR AND CANADA” below.) This affects only
+America/Inuvik as the rest of the territory is covered by America/Edmonton, for
+which the equivalent change was released in 2026c.
+
+## Changes to past timestamps
+
+Colombia’s 1992-05-02 spring forward was at 00:00, not 24:00.
+
+Iran’s 1979-05-26 spring forward was at 00:00, not 24:00. (Thanks to N.F. Hase.)
+
+The backward-compatibility names EST5EDT, CST6CDT, MST7MDT, and PST8PDT now
+conform better to POSIX.  For example, EST5EDT now always uses the abbreviation
+"EST" for standard time (now always 5 hours behind UT) and "EDT" for daylight
+saving time, whereas it formerly had different UT offsets before standard time
+was introduced and sometimes used abbreviations like "LMT", "EWT" and "EPT", all
+contrary to POSIX.  Also, though not required by POSIX these names now use US
+federal rules rather than rules of places like New York, reverting to 2024a
+behavior.  This change affects only timestamps before 1966-10-30 at 01:00
+standard time.
+
+## Other data changes
+
+The temporary hacks used for North American timekeeping changes now work around
+a libstdc++ std::chrono bug in GCC 14.1-14.4, 15.1-15.2, and 16.1; see GCC bug
+124851.  This data change does not affect TZif files or timestamps.  The change
+does not work around the related but less serious GCC bugs 116110 and 124513.
+These GCC bugs are all fixed in GCC 16.2.
+
+## Changes to documentation
+
+URLs for release tarballs in tz-link.html have been updated to reflect their new
+canonical URLs on data.iana.org.
\ No newline at end of file
diff --git a/src/tzdata/__init__.py b/src/tzdata/__init__.py
index a5a1077..87a91ab 100644
--- 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__ = "2026.3"
+__version__ = "2026.4rc0"
 
 # This exposes the original IANA version number.
-IANA_VERSION = "2026c"
+IANA_VERSION = "2026d"
diff --git a/src/tzdata/zoneinfo/America/Bogota b/src/tzdata/zoneinfo/America/Bogota
index 85b903333eb6325aa8343f6e9aee38447495303f..8b37a3d6217ec9c2ddd82a66fc648f81b37d7891 100644
GIT binary patch
delta 13
UcmdnYxS4T62{V)8g^A@h03dz@rvLx|

delta 13
UcmdnYxS4T62{UtXz{GMJ03aR&dH?_b

diff --git a/src/tzdata/zoneinfo/America/Inuvik b/src/tzdata/zoneinfo/America/Inuvik
index 86639f6ecb4c424911e5bdbca81a9e39c86e850c..20b2ad1ebe5733b29d27f78da6b3ea5808dc8485 100644
GIT binary patch
delta 386
zcmdnU*1<U;j5D8sfq@N(B{s%8Fx3MY4DPx$Ad12L@^S$X?a3Plq8L0kcY^s|ZymsV
z?>S2+fEYg4Vj4iSZ%sRx@3+kk%=eGU1oH!?DS-KbHr`-<P#F`LA1tE_=7)qn0rNxt
z@YjO{!c32W1;U={2rvLagxq5g#Sn3n56qAJcNENzTJizRkG{7Y%#Ufg1m?%?>jd-T
zQnrBk@$<65`~=?%6F`i__Vxx4ous=7%ui0w1oKmPt)_qlQr*450;zAy!2EP|T`)iW
zYy_B}$<7bvXRfsZ^Ru3PY?wTs$z$?<CN)OZ$<LYORQ~^8y?{YP*T8@wz$JtsAUK4<
P7leUqXCTc5B+R$~9%WSz

delta 73
zcmeC++{iW|jMIaGfq@l>MK;DeFipPB>@nGmMNUW8z<?pZC4?a$IE29$gn?`>Aj2HU
V(D60aGtx8A@ijEmGt@KS0sv=C5HbJ&

diff --git a/src/tzdata/zoneinfo/Asia/Tehran b/src/tzdata/zoneinfo/Asia/Tehran
index 6fd31e075a29223eeea3f9a1a747b4531775f8ef..2a46cf7c133770db40a3efe96b76af43a0ba602d 100644
GIT binary patch
delta 14
WcmZ3(wuWuO9OgAyCpOOSWdZ;$9|lnX

delta 14
WcmZ3(wuWuO9OkuqJT}hnWdZ;#k_IFI

diff --git a/src/tzdata/zoneinfo/CST6CDT b/src/tzdata/zoneinfo/CST6CDT
index b016880653929aa40dd5ac0e82e4094a9d787cdf..cc2cb2753c328f875e42430bb5a329ba82c39fa3 100644
GIT binary patch
delta 146
zcmcb`JBxin7-u*G0|OHfb4*NE;Xd8*ui-xsTuS8J?8n^6l*!0I6ZrrC>IDoe|NrmY
Rz{ue262jmdJox~d6aZ{~7sdbp

literal 1754
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diff --git a/src/tzdata/zoneinfo/EST5EDT b/src/tzdata/zoneinfo/EST5EDT
index 2b6c2eea14df07392729ae9f5712a44ec4f02bae..cc944f0eaa6f266c8fd25eed85dc9cee3f47baeb 100644
GIT binary patch
delta 169
zcmcb>JBxin7-u*G0|OHfb4*NE;Xd8*q2NCdTuS)8*^jxCsh*L6Ch-6Nof{Zf{{KII
lfRVw~C4|8>ID~-<NSFdSI=;qwMtTN1zJ`W+EQWdpTmU<T9Nqu`

literal 1744
zcmb8vc~FdD90%~HLuD)FSXb_AZECl}O63S8VJF8nxh5}Dn&pq)VT2iS6v+%R8pbh8
zbU9ZSR%{`w$+%iaIr5f-h*vpM?0TNB|CxR}&wlswdw;)Y|Jv0o(ys6$|1BFj!450U
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diff --git a/src/tzdata/zoneinfo/Iran b/src/tzdata/zoneinfo/Iran
index 6fd31e075a29223eeea3f9a1a747b4531775f8ef..2a46cf7c133770db40a3efe96b76af43a0ba602d 100644
GIT binary patch
delta 14
WcmZ3(wuWuO9OgAyCpOOSWdZ;$9|lnX

delta 14
WcmZ3(wuWuO9OkuqJT}hnWdZ;#k_IFI

diff --git a/src/tzdata/zoneinfo/MST7MDT b/src/tzdata/zoneinfo/MST7MDT
index 09e54e5c7c5bb2384e37626d4b985cfad29ed29b..f155fa9a2f5bdb45fb67ec2d6526db0d9d9d5c35 100644
GIT binary patch
delta 168
zcmbQlF^hdd7-u*G0|OHfb4*NE;Xd8TGvPlFTuPMKc(0SGo{@nj@c;k06Bt<j|6jd;
kk-^s`guypBgn<i4m;*UFzQ%e+dImbahK719hI$5E08>~SD*ylh

delta 266
zcmbQmK8a&Om|!9U0|P4%i~I+II2N7_6XR8a7p4B20OBuhVPgQ%OI#m-`AhnjHGuf1
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diff --git a/src/tzdata/zoneinfo/PST8PDT b/src/tzdata/zoneinfo/PST8PDT
index aaf07787ad92b65eadae63b64bba290f9f961507..6a27aeb92877e8706985377686ad7161524e0c98 100644
GIT binary patch
delta 160
zcmeC<n#DdLj5C~pfq@B#IVPs-G9{{Q-pAO<RL{sj6Zrpse**){|NnC*Ffs(VgfIjI
dhcIvf2@4=c$JbcTNY6mW*U(Up#Zb?H3jkkl6fFP%

delta 511
zcmbQm-p4f|Ot6-Lfq@l>Mg9Xp9E;R}iSfGi%3lgV+)IgS0wDU@zmgabeWPLR1Q31e
z-(fI)`@jUS{GEGC!Th@`*MRAJ``W?u{mwox{a{`un0}a90Hz<+d4uW4o<U&xNt`a2
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YlL9`zAq)X7KpYIj;XoWPxq(><0L~E$HUIzs

diff --git a/src/tzdata/zoneinfo/tzdata.zi b/src/tzdata/zoneinfo/tzdata.zi
index 079a47f..8a40631 100644
--- a/src/tzdata/zoneinfo/tzdata.zi
+++ b/src/tzdata/zoneinfo/tzdata.zi
@@ -1,4 +1,4 @@
-# version 2026c
+# version 2026d
 # redo posix_only
 # This zic input file is in the public domain.
 R d 1916 o - Jun 14 23s 1 S
@@ -264,7 +264,7 @@ R i 1977 o - Mar 21 23 1 -
 R i 1977 o - O 20 24 0 -
 R i 1978 o - Mar 24 24 1 -
 R i 1978 o - Au 5 1 0 -
-R i 1979 o - May 26 24 1 -
+R i 1979 o - May 26 0 1 -
 R i 1979 o - S 18 24 0 -
 R i 1980 o - Mar 20 24 1 -
 R i 1980 o - S 22 24 0 -
@@ -1863,7 +1863,7 @@ R x 2019 ma - Ap Su>=2 3u 0 -
 R x 2019 2021 - S Su>=2 4u 1 -
 R x 2022 o - S Su>=9 4u 1 -
 R x 2023 ma - S Su>=2 4u 1 -
-R CO 1992 o - May 3 0 1 -
+R CO 1992 o - May 2 0 1 -
 R CO 1993 o - F 6 24 0 -
 R EC 1992 o - N 28 0 1 -
 R EC 1993 o - F 5 0 0 -
@@ -1959,6 +1959,19 @@ R U 2005 o - Mar 27 2 0 -
 R U 2005 o - O 9 2 1 -
 R U 2006 2015 - Mar Su>=8 2 0 -
 R U 2006 2014 - O Su>=1 2 1 -
+R US 1918 1919 - Mar lastSu 2 1 D
+R US 1918 1919 - O lastSu 2 0 S
+R US 1942 o - F 9 2 1 D
+R US 1945 o - Au 14 23u 1 D
+R US 1945 o - S 30 2 0 S
+R US 1967 2006 - O lastSu 2 0 S
+R US 1967 1973 - Ap lastSu 2 1 D
+R US 1974 o - Ja 6 2 1 D
+R US 1975 o - F lastSu 2 1 D
+R US 1976 1986 - Ap lastSu 2 1 D
+R US 1987 2006 - Ap Su>=1 2 1 D
+R US 2007 ma - Mar Su>=8 2 1 D
+R US 2007 ma - N Su>=1 2 0 S
 Z Africa/Abidjan -0:16:8 - LMT 1912
 0 - GMT
 Z Africa/Algiers 0:12:12 - LMT 1891 Mar 16
@@ -2051,7 +2064,7 @@ 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 America/Adak 12:13:22 - LMT 1867 O 19 12:44:35
+Z America/Adak 12:13:22 - LMT 1867 O 19 0:31:13u
 -11:46:38 - LMT 1900 Au 20 12
 -11 - NST 1942
 -11 u N%sT 1946
@@ -2060,7 +2073,7 @@ Z America/Adak 12:13:22 - LMT 1867 O 19 12:44:35
 -11 u B%sT 1983 O 30 2
 -10 u AH%sT 1983 N 30
 -10 u H%sT
-Z America/Anchorage 14:0:24 - LMT 1867 O 19 14:31:37
+Z America/Anchorage 14:0:24 - LMT 1867 O 19 0:31:13u
 -9:59:36 - LMT 1900 Au 20 12
 -10 - AST 1942
 -10 u A%sT 1967 Ap
@@ -2360,7 +2373,7 @@ Z America/Detroit -5:32:11 - LMT 1905
 Z America/Edmonton -7:33:52 - LMT 1906 S
 -7 Ed M%sT 1987
 -7 C M%sT 2026 Jun 18
--7 1 MDT 2026 N 1 2
+-7 C MDT 2026 N 1 2
 -6 - CST
 Z America/Eirunepe -4:39:28 - LMT 1914
 -5 B %z 1988 S 12
@@ -2502,7 +2515,9 @@ Z America/Indiana/Winamac -5:46:25 - LMT 1883 N 18 18u
 Z America/Inuvik 0 - -00 1953
 -8 Y P%sT 1979 Ap lastSu 2
 -7 Y M%sT 1980
--7 C M%sT
+-7 C M%sT 2026 Au 21
+-7 C MDT 2026 N 1 2
+-6 - CST
 Z America/Iqaluit 0 - -00 1942 Au
 -5 Y E%sT 1999 O 31 2
 -6 C C%sT 2000 O 29 2
@@ -2512,7 +2527,7 @@ Z America/Jamaica -5:7:10 - LMT 1890
 -5 - EST 1974
 -5 u E%sT 1984
 -5 - EST
-Z America/Juneau 15:2:19 - LMT 1867 O 19 15:33:32
+Z America/Juneau 15:2:19 - LMT 1867 O 19 0:31:13u
 -8:57:41 - LMT 1900 Au 20 12
 -8 - PST 1942
 -8 u P%sT 1946
@@ -2596,7 +2611,7 @@ Z America/Merida -5:58:28 - LMT 1922 Ja 1 6u
 -6 - CST 1981 D 26 2
 -5 - EST 1982 N 2 2
 -6 m C%sT
-Z America/Metlakatla 15:13:42 - LMT 1867 O 19 15:44:55
+Z America/Metlakatla 15:13:42 - LMT 1867 O 19 0:31:13u
 -8:46:18 - LMT 1900 Au 20 12
 -8 - PST 1942
 -8 u P%sT 1946
@@ -2650,7 +2665,7 @@ Z America/New_York -4:56:2 - LMT 1883 N 18 17u
 -5 u E%sT 1946
 -5 NY E%sT 1967
 -5 u E%sT
-Z America/Nome 12:58:22 - LMT 1867 O 19 13:29:35
+Z America/Nome 12:58:22 - LMT 1867 O 19 0:31:13u
 -11:1:38 - LMT 1900 Au 20 12
 -11 - NST 1942
 -11 u N%sT 1946
@@ -2788,7 +2803,7 @@ Z America/Scoresbysund -1:27:52 - LMT 1916 Jul 28
 -2 c %z 1981 Mar 29
 -1 E %z 2024 Mar 31
 -2 E %z
-Z America/Sitka 14:58:47 - LMT 1867 O 19 15:30
+Z America/Sitka 14:58:47 - LMT 1867 O 19 0:31:13u
 -9:1:13 - LMT 1900 Au 20 12
 -8 - PST 1942
 -8 u P%sT 1946
@@ -2845,7 +2860,7 @@ Z America/Toronto -5:17:32 - LMT 1895
 Z America/Vancouver -8:12:28 - LMT 1884
 -8 Va P%sT 1987
 -8 C P%sT 2026 Mar 9
--8 1 PDT 2026 N 1 2
+-8 C PDT 2026 N 1 2
 -7 - MST
 Z America/Whitehorse -9:0:12 - LMT 1900 Au 20
 -9 Y Y%sT 1965
@@ -2856,7 +2871,7 @@ Z America/Whitehorse -9:0:12 - LMT 1900 Au 20
 Z America/Winnipeg -6:28:36 - LMT 1887 Jul 16
 -6 W C%sT 2006
 -6 C C%sT
-Z America/Yakutat 14:41:5 - LMT 1867 O 19 15:12:18
+Z America/Yakutat 14:41:5 - LMT 1867 O 19 0:31:13u
 -9:18:55 - LMT 1900 Au 20 12
 -9 - YST 1942
 -9 u Y%sT 1946
@@ -3457,6 +3472,8 @@ Z Australia/Perth 7:43:24 - LMT 1895 D
 Z Australia/Sydney 10:4:52 - LMT 1895 F
 10 AU AE%sT 1971
 10 AN AE%sT
+Z CST6CDT -6 US C%sT
+Z EST5EDT -5 US E%sT
 Z Etc/GMT 0 - GMT
 Z Etc/GMT+1 -1 - %z
 Z Etc/GMT+10 -10 - %z
@@ -3807,6 +3824,8 @@ Z Indian/Maldives 4:54 - LMT 1880
 5 - %z
 Z Indian/Mauritius 3:50 - LMT 1907
 4 MU %z
+Z MST7MDT -7 US M%sT
+Z PST8PDT -8 US P%sT
 Z Pacific/Apia 12:33:4 - LMT 1892 Jul 5
 -11:26:56 - LMT 1911
 -11:30 - %z 1950
@@ -3937,7 +3956,6 @@ L America/Noronha Brazil/DeNoronha
 L America/Sao_Paulo Brazil/East
 L America/Manaus Brazil/West
 L Europe/Brussels CET
-L America/Chicago CST6CDT
 L America/Halifax Canada/Atlantic
 L America/Winnipeg Canada/Central
 L America/Toronto Canada/Eastern
@@ -3951,7 +3969,6 @@ L Pacific/Easter Chile/EasterIsland
 L America/Havana Cuba
 L Europe/Athens EET
 L America/Panama EST
-L America/New_York EST5EDT
 L Africa/Cairo Egypt
 L Europe/Dublin Eire
 L Etc/GMT Etc/GMT+0
@@ -3977,7 +3994,6 @@ L Pacific/Kwajalein Kwajalein
 L Africa/Tripoli Libya
 L Europe/Brussels MET
 L America/Phoenix MST
-L America/Denver MST7MDT
 L America/Tijuana Mexico/BajaNorte
 L America/Mazatlan Mexico/BajaSur
 L America/Mexico_City Mexico/General
@@ -4175,6 +4191,5 @@ L Atlantic/Faroe Atlantic/Faeroe
 L Europe/Kyiv Europe/Kiev
 L Asia/Nicosia Europe/Nicosia
 L Pacific/Honolulu HST
-L America/Los_Angeles PST8PDT
 L Pacific/Guadalcanal Pacific/Ponape
 L Pacific/Port_Moresby Pacific/Truk
diff --git a/src/tzdata/zoneinfo/zone.tab b/src/tzdata/zoneinfo/zone.tab
index 69d50bd..8ff275a 100644
--- a/src/tzdata/zoneinfo/zone.tab
+++ b/src/tzdata/zoneinfo/zone.tab
@@ -123,7 +123,7 @@ CA	+5024-10439	America/Regina	CST - SK (most areas)
 CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
 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	+682059-1334300	America/Inuvik	CST - NT (west)
 CA	+4916-12307	America/Vancouver	MST - BC (most areas)
 CA	+4906-11631	America/Creston	MST - BC (Creston)
 CA	+5546-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
diff --git a/src/tzdata/zoneinfo/zone1970.tab b/src/tzdata/zoneinfo/zone1970.tab
index 635eabc..0c6a15c 100644
--- a/src/tzdata/zoneinfo/zone1970.tab
+++ b/src/tzdata/zoneinfo/zone1970.tab
@@ -114,7 +114,7 @@ CA	+5024-10439	America/Regina	CST - SK (most areas)
 CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
 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	+682059-1334300	America/Inuvik	CST - NT (west)
 CA	+4916-12307	America/Vancouver	MST - BC (most areas)
 CA	+5546-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
 CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
diff --git a/src/tzdata/zoneinfo/zonenow.tab b/src/tzdata/zoneinfo/zonenow.tab
index 9c3a8cf..1c9b44b 100644
--- a/src/tzdata/zoneinfo/zonenow.tab
+++ b/src/tzdata/zoneinfo/zonenow.tab
@@ -65,10 +65,10 @@ XX	+4916-12307	America/Vancouver	Mountain Standard (MST) - British Columbia (mos
 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; Mexico near US border; northern Canada
+XX	+394421-1045903	America/Denver	Mountain (MST/MDT) - US; Mexico near US border; western Nunavut
 #
 # -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
+XX	+5333-11328	America/Edmonton	Central Standard (CST) - Alberta, NWT, and some neighbors
 #
 # -06
 XX	-0054-08936	Pacific/Galapagos	Galápagos
diff --git a/src/tzdata/zones b/src/tzdata/zones
index d4c3ef5..aa0f556 100644
--- a/src/tzdata/zones
+++ b/src/tzdata/zones
@@ -239,6 +239,8 @@ Australia/Lord_Howe
 Australia/Melbourne
 Australia/Perth
 Australia/Sydney
+CST6CDT
+EST5EDT
 Etc/GMT
 Etc/GMT+1
 Etc/GMT+10
@@ -309,6 +311,8 @@ Factory
 Indian/Chagos
 Indian/Maldives
 Indian/Mauritius
+MST7MDT
+PST8PDT
 Pacific/Apia
 Pacific/Auckland
 Pacific/Bougainville
@@ -355,7 +359,6 @@ Brazil/DeNoronha
 Brazil/East
 Brazil/West
 CET
-CST6CDT
 Canada/Atlantic
 Canada/Central
 Canada/Eastern
@@ -369,7 +372,6 @@ Chile/EasterIsland
 Cuba
 EET
 EST
-EST5EDT
 Egypt
 Eire
 Etc/GMT+0
@@ -395,7 +397,6 @@ Kwajalein
 Libya
 MET
 MST
-MST7MDT
 Mexico/BajaNorte
 Mexico/BajaSur
 Mexico/General
@@ -593,6 +594,5 @@ Atlantic/Faeroe
 Europe/Kiev
 Europe/Nicosia
 HST
-PST8PDT
 Pacific/Ponape
 Pacific/Truk

From 2a2acc2fc2d1c5839310c218768f5cb054550340 Mon Sep 17 00:00:00 2001
From: Stan Ulbrych <stan@python.org>
Date: Sat, 12 Sep 2026 13:39:01 +0100
Subject: [PATCH 2/2] Bump version number

Co-authored-by: Stan Ulbrych <stan@python.org>
---
 VERSION                | 2 +-
 src/tzdata/__init__.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/VERSION b/VERSION
index f839d75..45826d6 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2026.4rc0
\ No newline at end of file
+2026.4
\ No newline at end of file
diff --git a/src/tzdata/__init__.py b/src/tzdata/__init__.py
index 87a91ab..6a72b92 100644
--- 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__ = "2026.4rc0"
+__version__ = "2026.4"
 
 # This exposes the original IANA version number.
 IANA_VERSION = "2026d"