Microsoft fixes daylight saving time bug in optional update, general patch coming next month

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Last month, we reported that several Windows clients were experiencing issues due to a Daylight Savings Time (DST) bug. Chilean users were mainly affected because in August the Chilean government announced that it was moving clocks forward one hour in the country from September 4 instead of September 10, along with other time zone updates. hourly.

This caused issues with incorrect times in Outlook, calendar, third-party apps, logs, Kerberos authentication, and more. In fact, Microsoft noted that even users outside of Chile could be affected if they connect to servers in the country. At the time, the Redmond tech company released workarounds, but it has now rolled out an official fix.

For now, the fix is ​​available as a Cumulative Preview update in the form of KB5017380. This update was initially rolled out for Insiders only, but is now also available to the uninitiated as an optional update.

It’s important to note that since this is an optional update available as a preview, you won’t get it automatically. In fact, you’ll have to go through the “seeker” experience of manually checking for updates in Windows Update.

Microsoft says The update will resolve this DST issue and more (see full changelog here) on the following Windows SKUs:

  • Windows 10, version 1809
  • Windows 10, version 20H2
  • Windows 10, version 21H1
  • Windows 10, version 21H2
  • Windows 10, version 22 H2
  • Windows Server 2022
  • Windows 11

Those who wish to wait for the update to become generally available will need to do so until next month’s Patch Tuesday, which this time falls on October 11.

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