From 19fbd4644f10a55f6836c57b9b65a4d2bb4423f0 Mon Sep 17 00:00:00 2001 From: Tim Parenti Date: Thu, 14 May 2026 21:50:43 -0400 Subject: Alberta has stopped changing clocks (Thanks to Roozbeh Bournader and others.) * NEWS: Mention this. * northamerica (America/Edmonton): Now permanently on -06. Model this with abbreviation CST and the transition on 2026-11-01; we can revise the date when the relevant OiC comes into effect. Also mention the potential impacts in portions of southeastern British Columbia which have followed Edmonton. --- NEWS | 10 ++++++++++ northamerica | 36 ++++++++++++++++++++++++++++++++++-- 2 files changed, 44 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index fb1ced7..19ba497 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,15 @@ News for the tz database +Unreleased, experimental changes + + Changes to future timestamps + + Alberta has 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 Pournader and others.) + + Release 2026b - 2026-04-22 23:06:43 -0700 Briefly: diff --git a/northamerica b/northamerica index 6198e72..5bb709f 100644 --- a/northamerica +++ b/northamerica @@ -1913,6 +1913,33 @@ 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 Roozbeh Pournader (2026-04-20): +# https://calgaryherald.com/opinion/columnists/bell-alberta-daylight-time-year-round-premier-danielle-smith +# +# From Tim Parenti (2026-04-23): +# Bill 31, the Red Tape Reduction Statutes Amendment Act, 2026 +# https://docs.assembly.ab.ca/LADDAR_files/docs/bills/bill/legislature_31/session_2/20251023_bill-031.pdf +# would repeal the Daylight Saving Time Act in the Revised Statues of Alberta +# 2000 Chapter D-5: +# https://kings-printer.alberta.ca/documents/Acts/D05.pdf +# ...and substitutes a new chapter with language that closely parallels the +# original. The new title is the Official Time Act and would be numbered +# Chapter O-5.7. The bill would establish a standard time of UTC−6 without +# replacing the language previously used to effectuate DST. +# +# From Paul Eggert (2026-05-13): +# Need a legal citation for the official 2026 change to the law. The bill +# specifies UT offset only; abbreviate it as CST for consistency. It requires +# an Order in Council signed by the Lieutenant Governor before it becomes +# legally binding. +# +# From Tim Parenti (2026-05-14): +# Royal Assent...was announced this morning. The stated intent of Alberta's +# government has been to have this in place prior to when the clocks would +# otherwise fall back on 2026-11-01. For now, use that date pending the Order +# in Council. This also works around potential CLDR limitations in the +# meantime; see British Columbia, below. + # 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 +1957,8 @@ 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 Nov 1 2:00 # presumed + -6:00 - CST # British Columbia @@ -2017,6 +2045,10 @@ Zone America/Edmonton -7:33:52 - LMT 1906 Sep # 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. +# From Tim Parenti (2026-05-14): +# RDEK has historically been aligned with neighboring Alberta. With the latter +# now opting to stay on -06 year-round, if RDEK does not follow, it would +# require a new zone for the Cranbrook area. # Rule NAME FROM TO - IN ON AT SAVE LETTER/S Rule Vanc 1918 only - Apr 14 2:00 1:00 D @@ -2033,7 +2065,7 @@ Zone America/Vancouver -8:12:28 - LMT 1884 -8:00 Vanc P%sT 1987 -8:00 Canada P%sT 2026 Mar 9 # Temporary hack; see above. - -8:00 1:00 PDT 2026 Nov 1 02:00 + -8:00 1:00 PDT 2026 Nov 1 2:00 # End of temporary hack. -7:00 - MST Zone America/Dawson_Creek -8:00:56 - LMT 1884 -- 2.50.1 (Apple Git-155)