Calendar Time Zone issue from App to Web on a Mac

Ashley Rommens 0 Reputation points
2026-10-13T19:41:59.8766667+00:00

I'm in Alberta, Canada, and my Outlook calendar displays meetings correctly on Outlook on the web, but all meetings from November 1, 2026 onward are one hour off in Outlook for Mac. This persists in both Legacy Outlook and New Outlook. My Mac and Outlook are fully updated, and the Mac's automatic date/time setting is greyed out. This appears related to Alberta's transition to permanent UTC−6 time. Can you confirm whether the Outlook for Mac time-zone update is available and provide a supported workaround?

Outlook | MacOS | New Outlook for Mac | For business

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  1. Kai-L 20,120 Reputation points Microsoft External Staff Moderator
    2026-10-13T20:29:21.8133333+00:00

    Dear Ashley,

    From my research, a few other users have reported similar behavior, but I couldn't find an official Microsoft confirmation, a published update or a supported workaround for this specific time zone change yet. For now, I'd recommend treating Outlook on the web as your reliable calendar view, since it shows the correct times.

    The pattern you describe points to the Mac rather than your mailbox. Outlook on the web uses the time zone stored in your account, while Outlook for Mac relies on the Mac's own time zone data. If that data hasn't been updated for the time zone change you mentioned, meetings after the change date would appear shifted by an hour, which matches what you're seeing.

    Go to System Settings > General > Date & Time and check which time zone is selected. If the options are greyed out, select the lock or enter your password first. If they stay greyed out, your Mac is likely managed by your organization. In that case, please ask your IT administrator to confirm the Mac has the latest time zone data and that their settings allow the updated time zone.

    If the issue persists, I recommend that the Global Admin in your organization create a service request with Microsoft Support. A technical support engineer can perform a remote session to investigate the situation, verify the backend configurations, and run any necessary synchronization tools to resolve the problem. If the issue requires further attention, they can escalate it to a specialized team for deeper analysis. For detailed instructions on how to get support, please refer to Get support - Microsoft 365 admin. If you don't know who your IT administrator is, please refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support 

    For additional assistance, use this link to find the appropriate contact number from your region: Contact Microsoft customer support | Microsoft Support 

    I hope this helps. Looking forward to your reply.

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  2. Stefan Blom 354.2K Reputation points MVP Volunteer Moderator
    2026-10-13T20:37:25.64+00:00

    @Ashley Rommens

    It appears to be only outlook. My apple calendar has the correct time.

    Thanks for the follow-up. Since this occurs in Outlook, report the error via the feedback facility in Outlook.

    You may also want to post a report in the public feedback forum at https://feedbackportal.microsoft.com/feedback/forum/89a8afa3-2e1c-ec11-b6e7-0022481f8472 .

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