A time zone change affects Windows devices in Manitoba, with Windows releasing a fix in October 2026. Manitoba is permanently moving to UTC-5 and will not set its clocks back on November 1, 2026. Microsoft recommends a temporary workaround for devices that can’t be updated in time. For the workaround steps and full guidance, visit the Daylight Saving Time & Time Zone Blog.
Message ID: MC1490598
Published: Oct 7, 2026
Service: Windows
Tag: Admin impact
Rollout schedule
- October 2026 – The Manitoba time zone will be included with the October 2026 Windows security update for all supported versions of Windows, including Windows Server.
- November 1, 2026 – The Manitoba time zone transition takes effect.
Impact on your organization
In Manitoba, existing time zones remain correct until November 1, 2026; after that date, devices will show an incorrect time until the update is installed. The update adds a new time zone, (UTC-05:00) Manitoba. Devices that set their time zone automatically will select the new time zone on their own; on other devices, users must select it manually.
Action required/recommendations
Install the update on affected devices in Manitoba before November 1, 2026. If you can’t install it in time, read and follow the interim guidance, listed in Additional information.
Compliance considerations
No compliance considerations are identified. Review as appropriate for your organization.
Additional information
- Daylight Saving Time & Time Zone Blog
- Interim guidance for Manitoba permanent DST 2026
- How Windows manages time zone changes
- Daylight saving time help and support