From 093b0a8cdc20b420b9b0a29061ae9e40ed687269 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Wed, 13 May 2026 23:39:35 -0700 Subject: [DRAFT] Alberta and NWT have stopped changing clocks (Thanks to Roozbeh Bournader and others.) * NEWS: Mention this. * northamerica (America/Edmonton, America/Inuvik): Now permanently on -06. Model this as abbreviation CST, with the legal transition on June 1; we can revise the dates when the relevant OiCs come into effect. --- NEWS | 10 ++++++++++ northamerica | 20 ++++++++++++++++++-- 2 files changed, 28 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index fb1ced71..c42ac887 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,15 @@ News for the tz database +Unreleased, experimental changes + + Changes to future timestamps + + Alberta and Northwest Territories have stopped changing clocks. + Standard time there is now -06, with abbreviation CST. + This affects UT offsets starting 2026-11-01 02:00, when clocks + will not fall back. (Thanks to Roozbeh Bournader and others.) + + Release 2026b - 2026-04-22 23:06:43 -0700 Briefly: diff --git a/northamerica b/northamerica index 6198e72e..1974987b 100644 --- a/northamerica +++ b/northamerica @@ -1913,6 +1913,15 @@ Zone America/Swift_Current -7:11:20 - LMT 1905 Sep # Boyer JP. Forcing Choice: The Risky Reward of Referendums. Dundum. 2017. # ISBN 978-1459739123. +# From Paul Eggert (2026-05-13): +# Need a legal citation for the official 2026 change to the law +# once it has royal assent. The 2026 Bill 31 text is here: +# https://docs.assembly.ab.ca/LADDAR_files/docs/bills/bill/legislature_31/session_2/20251023_bill-031.pdf +# The bill specifies UT offset only; abbreviate it as CST for consistency. +# It requires royal assent, and then an Order in Council signed by +# the lieutenant governor, before it becomes legally binding. +# For now, guess June with an “actual date unknown” comment. + # Rule NAME FROM TO - IN ON AT SAVE LETTER/S Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D Rule Edm 1918 only - Oct 27 2:00 0 S @@ -1930,7 +1939,8 @@ Rule Edm 1972 2006 - Oct lastSun 2:00 0 S # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone America/Edmonton -7:33:52 - LMT 1906 Sep -7:00 Edm M%sT 1987 - -7:00 Canada M%sT + -7:00 Canada M%sT 2026 Jun # actual date unknown + -6:00 - CST # British Columbia @@ -2361,6 +2371,11 @@ Zone America/Fort_Nelson -8:10:47 - LMT 1884 # about 1970, and uses PST for standard time in Yukon since then. Consistent # with that, use MST for -07, the new standard time in Yukon effective Nov. 1. +# From Paul Eggert (2026-05-13): +# Treat America/Inuvik like America/Edmonton this year, +# as Northwest Territories plans to stay in sync with Alberta. +# https://www.cbc.ca/news/canada/north/nwt-ends-daylight-saving-9.7170964 + # Rule NAME FROM TO - IN ON AT SAVE LETTER/S Rule NT_YK 1918 only - Apr 14 2:00 1:00 D Rule NT_YK 1918 only - Oct 27 2:00 0 S @@ -2402,7 +2417,8 @@ Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? Zone America/Inuvik 0 - -00 1953 # Inuvik founded -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 -7:00 NT_YK M%sT 1980 - -7:00 Canada M%sT + -7:00 Canada M%sT 2026 Jun # actual date unknown + -6:00 - CST Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 -9:00 NT_YK Y%sT 1965 -9:00 Yukon Y%sT 1966 Feb 27 0:00 -- 2.51.0