The previous Alberta commit was wrong, as the Order in Council it cites was about land use titles, not timekeeping. For now, revert the effect of the commit, by moving the America/Edmonton changes to commentary, which can be uncommented assuming the change becomes official. Also, add similar commentary to America/Inuvik, which likely will follow America/Edmonton’s lead. * NEWS: Update commentary. * northamerica (America/Edmonton): Move the draft timekeeping change to commentary, and move the now-commentary transition’s timestamp back to 2026-11-01 at 02:00. Remove commentary with an incorrect citation. (America/Inuvik): Add commentary about likely timekeeping change this fall. * zone.tab, zone1970.tab, zonenow.tab: Revert recent changes for America/Edmonton. --- NEWS | 19 +++++++++---------- northamerica | 36 ++++++++++++++++++++++-------------- zone.tab | 2 +- zone1970.tab | 2 +- zonenow.tab | 3 --- 5 files changed, 33 insertions(+), 29 deletions(-)
diff --git a/NEWS b/NEWS index 466a8a2e..c05b5c73 100644 --- a/NEWS +++ b/NEWS @@ -2,17 +2,16 @@ News for the tz database Unreleased, experimental changes - Briefly: - Alberta moves to permanent -06 on 2026-09-01. - - Changes to future timestamps + Changes to commentary - Alberta’s 2026-03-08 spring forward was its last foreseeable clock - change, as it moved to permanent -06 thereafter. (Thanks to - Roozbeh Pournader and others.) Although the change to permanent - -06 is legally scheduled for 2026-09-01, temporarily model the - change to occur on 2026-11-01 at 02:00, for the same reason we - have a similarly temporary hack for British Columbia. + The 2026-03-08 spring forward in Alberta and in Northwest + Territories was likely the last foreseeable clock change there, + as these areas are expected to move to permanent -06 thereafter. + (Thanks to Roozbeh Pournader and others.) This will affect UT + offsets starting 2026-11-01 02:00, when clocks would otherwise + fall back. Model this with its traditional abbreviation CST. + Unfortunately the change is not yet official, so it is currently + present only as comments that can be uncommented as needed. Changes to build procedure diff --git a/northamerica b/northamerica index b71bbe3b..7297301c 100644 --- a/northamerica +++ b/northamerica @@ -1943,15 +1943,19 @@ Zone America/Swift_Current -7:11:20 - LMT 1905 Sep # Chapter O-5.7. The bill would establish a standard time of UTC−6 without # replacing the language previously used to effectuate DST. # -# From Cary Sweet (2026-06-11): -# O.C. 170/2026 June 4, 2026 ... -# https://kings-printer.alberta.ca/Documents/Orders/Orders_in_Council/2026/2026_170.html -# From Paul Eggert (2026-06-11): -# Although the change takes effect on 2026-09-01, as a temporary hack pretend -# that it takes effect 2026-11-01 at 02:00. As with America/Vancouver, -# this pretense works around a limitation in CLDR v48.2 (2026-03-17). -# (Below, this temporary hack is marked “Temporary hack; see above.”) -# We should be able to remove the temporary hack after CLDR is fixed. +# 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. +# +# From Paul Eggert (2026-06-12): +# 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. As this has not yet happened, the changes are commented +# out for now in America/Edmonton. Similarly for America/Inuvik. # Rule NAME FROM TO - IN ON AT SAVE LETTER/S Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D @@ -1970,11 +1974,11 @@ 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 2026 Sep 1 - # Temporary hack; see above. - -7:00 1:00 MDT 2026 Nov 1 2:00 - # End of temporary hack. - -7:00 - CST + -7:00 Canada M%sT +# Assuming the relevant part of Red Tape Reduction Statutes Amendment Act, 2026 +# takes effect on 2026-11-01 at 02:00, replace the above line with: +# -7:00 Canada M%sT 2026 Nov 1 2:00 +# -6:00 - CST # British Columbia @@ -2465,6 +2469,10 @@ 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 +# Assuming Alberta stops changing clocks in fall 2026 and Northwest Territories +# follow Alberta, replace the above line with: +# -7:00 Canada M%sT 2026 Nov 1 2:00 +# -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 diff --git a/zone.tab b/zone.tab index 69d50bd8..2ae8a8c4 100644 --- a/zone.tab +++ b/zone.tab @@ -121,7 +121,7 @@ CA +744144-0944945 America/Resolute Central - NU (Resolute) CA +624900-0920459 America/Rankin_Inlet Central - NU (central) CA +5024-10439 America/Regina CST - SK (most areas) CA +5017-10750 America/Swift_Current CST - SK (midwest) -CA +5333-11328 America/Edmonton CST - AB, BC(E), NT(E), SK(W) +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) diff --git a/zone1970.tab b/zone1970.tab index 635eabcb..a9b47bcb 100644 --- a/zone1970.tab +++ b/zone1970.tab @@ -112,7 +112,7 @@ CA +744144-0944945 America/Resolute Central - NU (Resolute) CA +624900-0920459 America/Rankin_Inlet Central - NU (central) CA +5024-10439 America/Regina CST - SK (most areas) CA +5017-10750 America/Swift_Current CST - SK (midwest) -CA +5333-11328 America/Edmonton CST - AB, BC(E), NT(E), SK(W) +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) diff --git a/zonenow.tab b/zonenow.tab index e6babe81..c499cc84 100644 --- a/zonenow.tab +++ b/zonenow.tab @@ -67,9 +67,6 @@ XX +332654-1120424 America/Phoenix Mountain Standard (MST) - Arizona; western Me # -07/-06 - MST/MDT (North America DST) XX +394421-1045903 America/Denver Mountain (MST/MDT) - US & Canada; Mexico near US border # -# -07/-06 - MST/MDT (North America DST) until 2026-11-01 02:00; then CST -XX +5333-11328 America/Edmonton Central Standard (CST) - Alberta and some neighbors -# # -06 XX -0054-08936 Pacific/Galapagos Galápagos # -- 2.54.0
