From 8b46071fd85a7a9434d63894bac64d30362cc16d Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Tue, 3 Mar 2026 09:50:14 -0800 Subject: [PROPOSED] Most of BC moves from PDT to Pacific Time on 03-09 * NEWS: Mention this. * northamerica (America/Vancouver): Switch from daylight to standard time on 2026-03-09. For now, use the abbreviation "-07", though this will likely change to "MST" unless the BC government gives us guidance. * zonenow.tab (America/Vancouver): Add an entry that will likely be removed after 2026-03-09 when BC switches to -07. --- NEWS | 10 ++++++++++ northamerica | 29 ++++++++++++++++++++++++++++- zonenow.tab | 3 +++ 3 files changed, 41 insertions(+), 1 deletion(-) diff --git a/NEWS b/NEWS index acd22280..3ed61963 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,15 @@ News for the tz database +Unreleased, experimental changes + + Changes to future timestamps + + On 2026-03-09 British Columbia will go from daylight to standard + time, without a UT offset change. That is, its 2026-03-08 spring + forward will be its last foreseeable clock change, as it will move + to permanent -07 thereafter. (Thanks to Arthur David Olson.) + + Release 2026a - 2026-03-01 22:59:49 -0800 Briefly: diff --git a/northamerica b/northamerica index 16b79af2..815fda14 100644 --- a/northamerica +++ b/northamerica @@ -1957,6 +1957,32 @@ 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 (2026-03-03): +# 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, +# 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: +# 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 +# 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 + # 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 +1996,8 @@ 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 + -7:00 - -07 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/zonenow.tab b/zonenow.tab index aa3a64f3..76465722 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 (British Columbia DST) until 2026-03-09; then -07 +XX +4916-12307 America/Vancouver Pacific - BC (most areas) +# # -07 - MST XX +332654-1120424 America/Phoenix Mountain Standard (MST) - Arizona; western Mexico; Yukon # -- 2.51.0