Table of Contents
Summary
- A workaround is available for Windows Server 2016 devices in Egypt to address a Daylight Saving Time issue affecting calendar events.
- Without the workaround, clocks will not advance by one hour on April 24, 2026, but will automatically adjust on May 1, 2026.
- Applying the workaround allows affected devices to avoid issues during the last week of April 2026.
- No action is needed for devices not using Windows Server 2016 or those on in-support versions of Windows.
- Additional guidance and support can be found through provided links.
Admin Impact: High
User Impact: Low
Release Start: 24 Apr 2026
Release End: 24 Apr 2026
Services: Server 2016
Category: Prevent or fix issues
Tags: Admin Action
History
4/17/2026 Item Added to Message Center
4/20/2026 The URLs in the “Additional information” section have been simplified by removing unnecessary tracking data.
Microsoft Message
For Windows devices in Egypt, a workaround is available for an issue affecting Daylight Saving Time (DST). Between April 24 and April 30, 2026, calendar events and meeting times in Egypt will appear off by one hour only for Windows Server 2016. This is due to a calendar edge case: a five-week April in 2026. Clocks will be correctly set to Egypt DST time zone on May 1, 2026, without any further intervention. If needed, a temporary workaround is available for the affected week.
When will this happen
- The workaround is available today.
- April 24-30, 2026: Affected devices might see calendar events off by an hour.
- May 1, 2026: Clocks will be correctly set to Egypt DST time zone without any further intervention, whether you use the workaround or not.
How this will affect your organization
If your organization has devices affected by this issue and you don’t apply the workaround, the impact is as follows:
- Clocks will not be advanced by an hour at 12:00 a.m. on April 24, 2026, for the Egypt time zone until 12:00 a.m. on May 1, 2026.
- Clocks will be automatically advanced by an hour at 12:00 a.m. on May 01, 2026, for the Egypt time zone.
If you apply the workaround, you can avoid this issue during the last week of April 2026.
What you need to do to prepare
No action is needed if you don’t use Windows Server 2016, and all other devices use in-support versions of Windows. If your devices are affected, you can use a temporary registry setting workaround. No action is needed after May 1, 2026. On that date, all in-support systems will show the correct Egypt DST time automatically.
Additional information
- See complete guidance in Interim guidance for Egypt DST changes 2026.
- Visit the official policy page at Daylight saving time help and support.
- Learn How Windows manages time zone changes.