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MC1510951: Windows Adds 2026 Time Zone Updates for Manitoba, Alberta, and British Columbia

4 minutesPosted inDynamics 365 Apps, Exchange Online, Microsoft 365 suite, Power BI, Power Platform
MWPRO IMPACT SCORE
OPERATIONAL IMPACT
66
0 25 50 75 100
HIGH IMPACT • REVIEW RECOMMENDED
Recommended Action:
Review the update and plan any required actions before rollout.
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Primary Audience

Tenant AdminsMicrosoft 365 AdminsIT ManagersExchange AdminsService Owners
Why this score?
AI Confidence
HIGH
Enough detail is available to trust this assessment.
Assessment Reasoning
Windows updates for 2026 time zone reforms in Manitoba, Alberta and British Columbia are now released, with final transitions effective 1 November 2026. Admins must ensure updates are deployed and region-specific time zones selected, or users will see incorrect times in Windows and Outlook. The change requires validation and adjustment across affected devices and calendars before the transition date, creating moderate configuration and coordination work. The update adds Outlook guidance, confirming this is an operational update rather than a new rollout.
70
🛡️ Admin Impact
HIGH
45
👥 User Impact
MEDIUM
75
⚡ Urgency
CRITICAL
60
🔧 Effort
HIGH
ℹ️ WHAT YOU NEED TO KNOW
📌

AT A GLANCE

Windows updates add new time zones for Alberta, British Columbia and Manitoba. Devices need these updates to display the correct time after 1 November 2026.
👥

END USERS

Users in affected provinces may see local time stay the same when clocks usually go back.
🛡️

IT ADMINS

Install the October updates and confirm affected devices use the correct region-specific time zone before 1 November.
📅

ROLLOUT TIMELINE

Available:
October 2026

📢 Official Microsoft Message Center Announcement

(Updated) Windows updates are available for 2026 time zone changes in Canada
Message ID: MC1510951

(Updated October 16, 2026: Added guidance for managing the Alberta and British Columbia time zone changes in Outlook Time Zone Changes for Alberta and British Columbia.)

What and why

Windows updates are now available to support the 2026 time zone changes in Manitoba, Alberta, and British Columbia. On November 1, 2026, clocks in affected regions will not be set back by one hour.

Manitoba will permanently stay on UTC-5, Alberta and affected locations will permanently stay on UTC-6, and most of British Columbia will permanently stay on UTC-7. The new Windows updates add region-specific time zones to support these changes.

Rollout schedule

  • September 22, 2026: The Alberta and British Columbia changes became available in the September 2026 non-security preview update for Windows 11, versions 25H2 and 24H2.
  • October 13, 2026: The Manitoba change became available for all supported versions of Windows. The Alberta and British Columbia changes became available for all other supported versions of Windows, including Windows Server. These changes are included in the October 2026 security update.
  • November 1, 2026: The time zone transitions take effect at 2:00 a.m. local time. Clocks in affected areas will not be set back by one hour.

Impact on your organization

Devices in affected regions will display an incorrect local time after the November 1, 2026 transition if the applicable Windows update is not installed or the appropriate time zone is not selected. The updates add the following region-specific time zones:

  • (UTC-05:00) Manitoba 
  • (UTC-06:00) Mountain Time (Alberta)
  • (UTC-07:00) Pacific Time (British Columbia)

The Alberta time zone change also applies to Yellowknife and Inuvik in the Northwest Territories and locations in southeastern British Columbia that align with Alberta.

Devices configured to set the time zone automatically will select the appropriate new time zone. On other devices, the new region-specific time zone must be selected manually.

Action required/recommendations

  • Install the applicable Windows update on affected devices before November 1, 2026.
  • Confirm that affected devices use the appropriate region-specific time zone after installing the update.
  • If a device cannot receive the update before November 1, 2026, read and follow the interim guidance for each affected region detailed in the Daylight Saving Time & Time Zone Blog and move the device to the appropriate region-specific time zone as soon as possible.

Note: To manage this change in Outlook, please follow the guidance in the article Outlook Time Zone Changes for Alberta and British Columbia.

Compliance considerations

No compliance considerations are identified. Review as appropriate for your organization and region-specific time zone.

Additional information

Source: Microsoft Message Center • Analysed by MWPro

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