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Daylight Saving Time & Time Zone Blog
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Interim guidance for British Columbia time zone changes 2026

Naveen_Shankar's avatar
Naveen_Shankar
Icon for Microsoft rankMicrosoft
Aug 07, 2026

Microsoft has made a decision about addressing the new time-related change for British Columbia.

Editor's note October 13, 2026: Microsoft has released an update to address the new time-related change for British Columbia. Please refer to British Columbia 2026 time zone update available now Ea...
Updated Oct 27, 2026
Version 7.0
RyanSteele-CoV's avatar
RyanSteele-CoV
Steel Contributor
Oct 05, 2026

I've installed the preview update that adds the new PCT time zone. When I select that zone in the Date and Time settings in Windows and try to load Microsoft Planner (https://planner.cloud.microsoft), it fails to load, just displaying a blank screen. If I open the Developer Console, I see the following error logged twice:

react-dom.production.min.js:188 TypeError: Temporal error: Time zone must be string or ZonedDateTime object.
    at ZonedDateTime.withTimeZone (<anonymous>)
    at W.isLate (Task.js:836:59)
    at TaskCard.js:454:26
    at St (TaskCard.js:466:12)
    at gs (react-dom.production.min.js:160:137)
    at Su (react-dom.production.min.js:289:337)
    at _c (react-dom.production.min.js:279:389)
    at vc (react-dom.production.min.js:279:320)
    at gc (react-dom.production.min.js:279:180)
    at oc (react-dom.production.min.js:270:88)
Li @ react-dom.production.min.js:188