The end of seasonal clock changes in parts of Canada has thrown a wrench in Microsoft software.
Some customers faced problems with schedules and incorrect times, online enterprise technology outlet The Register reported on Monday.
Due to the time zone changes in Canada, Microsoft published its guidance for its products on Oct. 26 and updated it on Monday.
In its executive summary, Microsoft noted “confirmed” impacts on the following products:
- Outlook and Exchange Online calendar
- Microsoft Teams Rooms on Windows
- Teams Auto Attendant
- SharePoint On-Prem
- Power Automate Desktop + Cloud Flows
- Fabric
- Microsoft Bookings
- Dynamics 365 Finance and Operations
Other products that could be affected include Microsoft Teams (desktop, web, mobile) and other Teams devices, as well as Outlook for iOS, Android, and Mac and Power Pages.
Those using Outlook and Exchange Online would have issues with existing calendar events that “do not migrate automatically, and recurring meetings need additional review,” according to the company’s guidance.
Those using Teams Rooms on Windows would have devices that showed the time that’s one hour behind Windows, it noted. Teams Auto Attendant and Teams Events may not show the correct time zones.
For Power Automate Desktop + Cloud Flows programs, it recommended users use the temporary mappings. For instance, those in Manitoba would use SA Pacific Standard Time in Bogota, Colombia.
“On November 1, 2026, affected locations in British Columbia, Alberta, and Manitoba will not turn their clocks back. They will remain on UTC−07:00, UTC−06:00 and UTC−05:00 respectively,” Microsoft said in its statement. “Affected locations in the Northwest Territories (including Yellowknife and Inuvik) align with the Alberta change, and Northwestern Ontario aligns with the Manitoba change.”
Time zones are defined by their difference from UTC, the time standard typically used to find out local times anywhere in the world.
In its guidance, Microsoft recommended users complete the actions before Nov. 1., when daylight time ended and standard time began for those areas following the seasonal time changes. Among its recommended actions, it advised admins to ensure they have the latest Windows updates installed on Windows devices used to access Microsoft 365 in order to receive the time zone update.
“Product teams are actively confirming impact, mitigations and timelines across Microsoft products,” according to the guidance.
The company recommended that users check for updates on “additional impacts” and “fixes.”
