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Firefox is lacking support for new timezones in Canada

I-Firefox Site breakages
TyDraniu replied 1 ihora elidlule
nsal9
nsal9

Canadian provinces of BC, AB, and MB are all moving to new timezones on Nov 1, 2026.

Firefox still does not support any of the new timezones. This will break automatic timezone support for many applications, if not addressed immediately.

For the new timezone: Pacific Time (British Columbia): - Intl.DateTimeFormat().resolvedOptions().timeZone returns "Etc/GMT+8" instead of the expected value 'America/Vancouver' - new Date().getTimezoneOffset() returns 480 instead of the expected 420

There is only a few days left to address this issue. What is the rollout plan for the required updates?

Thanks.

Canadian provinces of BC, AB, and MB are all moving to new timezones on Nov 1, 2026. Firefox still does not support any of the new timezones. This will break automatic timezone support for many applications, if not addressed immediately. For the new timezone: Pacific Time (British Columbia): - Intl.DateTimeFormat().resolvedOptions().timeZone returns "Etc/GMT+8" instead of the expected value 'America/Vancouver' - new Date().getTimezoneOffset() returns 480 instead of the expected 420 There is only a few days left to address this issue. What is the rollout plan for the required updates? Thanks.

All Replies (5)

TyDraniu
TyDraniu
  • Abanegalelo Abayi-10 Abaphambili

Isisombululo Esikhethiwe

It should be ready in Firefox 159, will be released on Tuesday.

nsal9
nsal9 Umnikazi wombuzo

Thanks. Looking forward to it. The timing is super tight for application support.

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Abanegalelo Abangama-25 Abaphambili

If you need to test immediately, try Firefox Developer Edition, based on the upcoming version during its beta. https://www.firefox.com/channel/desktop/developer/

Although by now... never mind.

hairbell3
hairbell3

Wrong timezone in Vancouver BC, today 2026-11-09. In Mailchimp campaigns summary screen, time of last change is off by one hour. Last month this display of "campaign" modification time was correct. In DuckDuckGo or Safari Correct time shown for same page.

Firefox 159.0.1 (aarch64) under MacOS Tahoe 26.6.2 (25G83)k System Settings / Date & Time shows "Pacific Daylight Time"

TyDraniu
TyDraniu
  • Abanegalelo Abayi-10 Abaphambili

If you see any bugs, please report it in Bugzilla.

Buza umbuzo

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