As a temporary hack, model the timezone change for America/Vancouver

as occurring on 2026-11-01 02:00, not on 2026-03-09.  This allows
for a transition period where America/Vancouver still shows as PDT.

It also replaces "-07" with "MST" post-transition until such time
as a better abbreviation is chosen.

share/zoneinfo/datfiles/northamerica

@@ -1,4 +1,4 @@
-# $OpenBSD: northamerica,v 1.90 2026/03/05 17:41:23 millert Exp $
+# $OpenBSD: northamerica,v 1.91 2026/03/08 00:08:52 millert Exp $
 # tzdb data for North and Central America and environs
 
 # This file is in the public domain, so clarified as of
@@ -1962,22 +1962,32 @@ Zone America/Edmonton	-7:33:52 -	LMT	1906 Sep
 # 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 (2026-03-03):
-# The law specifies a 2026-03-08 02:00 switch from PST to PDT, then 21 hours
-# of PDT, then a 2026-03-09 switch to the new standard time Pacific Time,
+# 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 yet.
-# For now, use the abbreviation -07; we can decide later what (if any)
-# conforming non-numeric abbreviation to use.  Possibilities include:
+# 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 v48.1 (2026-01-08),
+#	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”
@@ -1997,7 +2007,10 @@ Rule	Vanc	1962	2006	-	Oct	lastSun	2:00	0	S
 Zone America/Vancouver	-8:12:28 -	LMT	1884
 			-8:00	Vanc	P%sT	1987
 			-8:00	Canada	P%sT	2026 Mar  9
-			-7:00	-	-07
+			# 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

share/zoneinfo/datfiles/zone.tab

@@ -1,4 +1,4 @@
-# $OpenBSD: zone.tab,v 1.79 2025/03/25 14:34:41 millert Exp $
+# $OpenBSD: zone.tab,v 1.80 2026/03/08 00:08:52 millert Exp $
 # tzdb timezone descriptions (deprecated version)
 #
 # This file is in the public domain, so clarified as of
@@ -130,7 +130,7 @@ 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)
+CA	+4916-12307	America/Vancouver	British Columbia (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)

share/zoneinfo/datfiles/zone1970.tab

@@ -1,4 +1,4 @@
-# $OpenBSD: zone1970.tab,v 1.32 2025/03/25 14:34:41 millert Exp $
+# $OpenBSD: zone1970.tab,v 1.33 2026/03/08 00:08:52 millert Exp $
 # tzdb timezone descriptions
 #
 # This file is in the public domain.
@@ -120,7 +120,7 @@ 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)
+CA	+4916-12307	America/Vancouver	British Columbia (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

share/zoneinfo/datfiles/zonenow.tab

@@ -58,8 +58,8 @@ 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 (British Columbia DST) until 2026-03-09; then -07
-XX	+4916-12307	America/Vancouver	Pacific - BC (most areas)
+# -08/-07 - PST/PDT (North America DST) until 2026-11-01 02:00; then MST
+XX	+4916-12307	America/Vancouver	British Columbia (most areas)
 #
 # -07 - MST
 XX	+332654-1120424	America/Phoenix	Mountain Standard ("MST") - Arizona; western Mexico; Yukon