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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
OzoVei's avatar
OzoVei
Brass Contributor
Oct 14, 2026

More bugs:

  • Timestamps on teams chat messages are off by 1 hour after setting windows to the new BC time zone. This affects the desktop and browser client.
  • Web browser APIs report local time zone is UTC-7 instead of UTC-8 (as seen on sites like https://webbrowsertools.com/timezone)
  • When booking a room resource in Outlook, no rooms appear in the list of rooms. If the meeting is changed to the old time zone, then rooms appear. All user and room mailboxes have already been set to the new time zone, and all working hours for rooms and users are also set to the new time zone.

Can anyone from Microsoft respond and confirm if something is being done about all the bugs?

gregs36's avatar
gregs36
Tin Contributor
Oct 14, 2026

We have observed the same. A clear 1 hour difference in Teams vs the local system time even though Teams is configured to use system time.

In addition, most desktops in our org are still in the old time zone even though the new one is available and "Detect time zone" is on.  Turning that setting off and on again prompts the user to use the new time zone.