vendor/tzdata/tzdata2026bvendor/tzdata

6 files changed, 106 insertions, 12 deletions

diff --git a/NEWS b/NEWS
index acd22280cb3a..a0042701c687 100644
--- a/NEWS
+++ b/NEWS
@@ -1,10 +1,47 @@
 News for the tz database
 
+Release 2026a - 2026-04-22 23:06:43 -0700
+
+  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.
+
+  Changes to code
+
+    zic no longer mishandles a last transition to a new time type.
+
+    zic no longer overflows a buffer when generating a TZ string like
+    "PST-167:59:58PDT-167:59:59,M11.5.6/-167:59:59,M12.5.6/-167:59:59",
+    which can occur with adversarial input.  (Thanks to Naveed Khan.)
+
+    zic no longer generates a longer TZif file than necessary when
+    an earlier time zone abbreviation is a suffix of a later one.
+    As a nice side effect, zic no longer overflows a buffer when given
+    a long series of abbreviations, each a suffix of the next.
+    (Buffer overflow reported by Arthur Chan.)
+
+    zic no longer overflows an int when processing input like ‘Zone
+    Ouch 2147483648:00:00 - LMT’.  The int overflow can lead to buffer
+    overflow in adversarial cases.  (Thanks to Naveed Khan.)
+
+    zic now checks for signals more often.
+
+
 Release 2026a - 2026-03-01 22:59:49 -0800
 
   Briefly:
     Moldova has used EU transition times since 2022.
-    The "right" TZif files are no longer installed by default.
+    The “right” TZif files are no longer installed by default.
     -DTZ_RUNTIME_LEAPS=0 disables runtime support for leap seconds.
     TZif files are no longer limited to 50 bytes of abbreviations.
     zic is no longer limited to 50 leap seconds.
@@ -25,23 +62,23 @@ Release 2026a - 2026-03-01 22:59:49 -0800
 
     The Makefile no longer by default installs an alternate set
     of TZif files for system clocks that count leap seconds.
-    Install with 'make REDO=posix_right' to get the old default,
+    Install with ‘make REDO=posix_right’ to get the old default,
     which is rarely used in major downstream distributions.
     If your system clock counts leap seconds (contrary to POSIX),
-    it is better to install with 'make REDO=right_only'.
+    it is better to install with ‘make REDO=right_only’.
     This change does not affect the leapseconds file, which is still
     installed as before.
 
-    The Makefile's POSIXRULES option, which was declared obsolete in
-    release 2019b, has been removed.  The Makefile's build procedure
+    The Makefile’s POSIXRULES option, which was declared obsolete in
+    release 2019b, has been removed.  The Makefile’s build procedure
     thus no longer optionally installs the obsolete posixrules file.
 
   Changes to code
 
     Compiling with the new option -DTZ_RUNTIME_LEAPS=0 disables
     runtime support for leap seconds.  Although this conforms to
-    POSIX, shrinks tzcode's attack surface, and is more efficient,
-    it fails to support Internet RFC 9636's leap seconds.
+    POSIX, shrinks tzcode’s attack surface, and is more efficient,
+    it fails to support Internet RFC 9636’s leap seconds.
 
     zic now can generate, and localtime.c can now use, TZif files that
     hold up to 256 bytes of abbreviations, counting trailing NULs.
@@ -51,7 +88,7 @@ Release 2026a - 2026-03-01 22:59:49 -0800
 
     zic -L can now generate TZif files with more than 50 leap seconds.
     This helps test TZif readers not limited to 50 leap seconds, as
-    tzcode's localtime.c is; it has little immediate need for
+    tzcode’s localtime.c is; it has little immediate need for
     practical timekeeping as there have been only 27 leap seconds and
     possibly there will be no more, due to planned changes to UTC.
     zic -v warns if its output exceeds the old 50-second limit.
diff --git a/northamerica b/northamerica
index 16b79af29b55..3e8641e1c20a 100644
--- a/northamerica
+++ b/northamerica
@@ -1957,6 +1957,56 @@ Zone America/Edmonton	-7:33:52 -	LMT	1906 Sep
 # https://searcharchives.vancouver.ca/daylight-saving-1918-starts-again-july-7-1941-start-d-s-sept-27-end-of-d-s-1941
 # We have no further details, so omit them for now.
 
+# From Arthur David Olson (2026-03-02):
+# B. C. Gov News: “Adopting permanent daylight saving time: ‘Spring forward’
+# on March 8 will be the last time change, ending twice-yearly clock changes.”
+# https://news.gov.bc.ca/releases/2026AG0013-000209
+#
+# From Paul Eggert (2026-03-07):
+# The law says that 21 hours after the usual 2026-03-08 02:00 switch from
+# PST to PDT, the next day inaugurates the new standard time Pacific Time,
+# i.e., just one clock change but two name changes separated by 21 hours.
+# PT, the obvious abbreviation for Pacific Time, is one letter too short
+# to conform to TZDB’s (and POSIX’s) [-+[:alnum:]]{3,6} requirements.
+# I asked the BC government for advice, with no response. For now, do this:
+#   1.	As a temporary hack, pretend that the BC law takes effect
+#	not on 2026-03-09 at 00:00, but on 2026-11-01 at 02:00.
+#	This pretense works around a limitation in CLDR v48.2 (2026-03-17),
+#	which would otherwise say the interval uses “Pacific Standard Time”.
+#	(Below, this temporary hack is marked “Temporary hack; see above.”)
+#	Strictly speaking this hack is incorrect since the interval uses
+#	standard time, but it does have the right UT offset and it
+#	works around the CLDR limitation.  We should be able to remove
+#	the temporary hack after CLDR is fixed.
+#   2.	After the BC law takes effect, model the time as MST sans DST.
+#	We can change this later if another conforming non-numeric abbreviation
+#	for Pacific Time becomes more popular.  Possibilities include:
+#   MST - the most compatible with existing software and practice,
+#	and already used in parts of BC and in Yukon
+#   PDT - almost as software-friendly, but confusing because it implies
+#	it is DST and is paired with PST, whereas PT is standard time
+#   PST - straightforward but even more confusing,
+#	and will likely break much software that assumes PST is -08
+#   -07 - accurate and clear in itself, but makes BC look odd vs neighbors
+#   CPT, CPST - for Canadian Pacific (Standard) Time,
+#	by analogy with AEST in Australia
+#   P-T - conforming approximation to “PT”
+#   PT+ - like P-T but suggesting one-hour advance over PST
+
+# From Chris Walton (2026-03-15):
+# The Regional District of East Kootenay is planning to move to year-round
+# Mountain Standard Time (MST) on November 1, 2026....
+# https://www.rdek.bc.ca/news/entry/rdek_board_moves_to_transition_to_year_round_mountain_standard_time
+# (2026-03-17):
+# The final decision East Kootenay made a few days ago may turn out not to
+# be final after all. They are going to reopen the debate next month!
+# https://www.cbc.ca/news/canada/british-columbia/what-time-is-it-in-the-east-kootenay-debate-9.7132624
+# From Paul Eggert (2026-03-17):
+# Mayor Steve Fairbairn of Elkford asked the question be called a second time,
+# saying, “Pardon the pun, but this is not a time-sensitive issue.”
+# For now, merely mention the potential change in these comments.
+# If it happens it would likely affect clocks starting 2027-03-14 at 02:00.
+
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Vanc	1918	only	-	Apr	14	2:00	1:00	D
 Rule	Vanc	1918	only	-	Oct	27	2:00	0	S
@@ -1970,7 +2020,11 @@ Rule	Vanc	1962	2006	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/Vancouver	-8:12:28 -	LMT	1884
 			-8:00	Vanc	P%sT	1987
-			-8:00	Canada	P%sT
+			-8:00	Canada	P%sT	2026 Mar  9
+			# Temporary hack; see above.
+			-8:00	1:00	PDT	2026 Nov  1 02:00
+			# End of temporary hack.
+			-7:00	-	MST
 Zone America/Dawson_Creek -8:00:56 -	LMT	1884
 			-8:00	Canada	P%sT	1947
 			-8:00	Vanc	P%sT	1972 Aug 30  2:00
diff --git a/version b/version
index 5d9126009e7f..75d34ee38931 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-2026a
+2026b
diff --git a/zone.tab b/zone.tab
index 2626b0550341..2ae8a8c439eb 100644
--- a/zone.tab
+++ b/zone.tab
@@ -124,12 +124,12 @@ CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
 CA	+5333-11328	America/Edmonton	Mountain - 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)
 CA	+4906-11631	America/Creston	MST - BC (Creston)
 CA	+5546-12014	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)
 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)
diff --git a/zone1970.tab b/zone1970.tab
index cd43e3d2e0d8..a9b47bcb309a 100644
--- a/zone1970.tab
+++ b/zone1970.tab
@@ -115,11 +115,11 @@ CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
 CA	+5333-11328	America/Edmonton	Mountain - 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)
 CA	+5546-12014	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)
 CH,DE,LI	+4723+00832	Europe/Zurich	Büsingen
 CI,BF,GH,GM,GN,IS,ML,MR,SH,SL,SN,TG	+0519-00402	Africa/Abidjan
 CK	-2114-15946	Pacific/Rarotonga
diff --git a/zonenow.tab b/zonenow.tab
index aa3a64f3d7b9..54e4485d7441 100644
--- a/zonenow.tab
+++ b/zonenow.tab
@@ -58,6 +58,9 @@ 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
 #
+# -08/-07 - PST/PDT (North America DST) until 2026-11-01 02:00; then MST
+XX	+4916-12307	America/Vancouver	MST - BC (most areas)
+#
 # -07 - MST
 XX	+332654-1120424	America/Phoenix	Mountain Standard (MST) - Arizona; western Mexico; Yukon
 #