critical · manitoba_permanent_time_effective_date
On what date did Manitoba's permanent time change (permanent UTC−5) take legal effect?
The enacted legislation entry says Manitoba's permanent time amendment was proclaimed in force on 31 October 2026, but the tzdata rule changes entry says the legal date for Manitoba's permanent UTC−5 is 2026-10-31 with a temporary modeling date of 2026-11-01.
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1 November 2026 (modeled)
tzdata temporarily models Manitoba's permanent time change at 2026-11-01 02:00, though the legal date is 2026-10-31.
IANA Time Zone Database — tz database NEWS - Release 2026e
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31 October 2026
Manitoba's permanent time change took effect on 31 October 2026.
Source: Province of Manitoba (Lieutenant Governor) — The Official Time Amendment Act (S.M. 2023, c. 4) - Proclamation naming 31 October 2026 as the in-force date URL: https://web2.gov.mb.ca/laws/statutes/proclamations/2023c4(2026-10-31).pdf Authority tier: primary PROCLAMATION The Official Time Amendment Act (S.M. 2023, c. 4) With the advice and consent of the Executive Council of Manitoba, we name October 31, 2026, as the day on which The Official Time Amendment Act (S.M. 2023, c. 4) comes into force. PROCLAMATION Loi modifiant la Loi sur le temps réglementaire, c. 4 des L.M. 2023 Sur l'avis et avec le consentement du Conseil exécutif du Manitoba, nous fixons au 31 octobre 2026 la date d'entrée en vigueur de la Loi modifiant la Loi sur le temps réglementaire, c. 4 des L.M. 2023. HER HONOUR ANITA R. NEVILLE Lieutenant Governor of the Province of Manitoba Winnipeg, Manitoba September 23, 2026 Minister of Justice and Attorney General MATT WIEBE ANITA R. NEVILLE, Lieutenante-gouverneure du Manitoba Winnipeg (Manitoba) Le 23 septembre 2026 Le ministre de la Justice et procureur général, MATT WIEBE
Province of Manitoba (Lieutenant Governor) — The Official Time Amendment Act (S.M. 2023, c. 4) - Proclamation naming 31 October 2026 as the in-force date · Province of Manitoba (King's Printer, C.C.S.M.) — The Official Time Act, C.C.S.M. c. O30 (current consolidation)
Draft by claude-sonnet-5-5 · side 2
The primary source is the Lieutenant Governor's proclamation of 23 September 2026. It names 31 October 2026 as the day The Official Time Amendment Act (S.M. 2023, c. 4) comes into force. The primary source outranks secondary reference data. The tzdata entry itself says 31 October is the legal date and gives 1 November only as a temporary modeling choice. So the legal in-force date is 31 October 2026.
Checked against the dataset: The typed regimes for America/Winnipeg show the DST regime (UTC−6 standard offset, DST on) ending at 2026-10-31T05:00:00Z. A non-DST UTC−5 regime starts at that same instant. This agrees with 31 October 2026 and not with the 1 November modeled date. The only Manitoba instrument in the typed records is a community news item marked enacted_not_effective, which is not authoritative and predates the proclamation. It does not contradict the primary source.
Approved by Clockwrit reviewer on 2026-10-04 18:55 UTC. The Knowledge Base now carries this as a standing instruction for every rebuild.
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