Windows 10/ 11: Possible daylight saving time changeover issues [in Chile and worldwide]

[German]Windows users in Chile could have problems with the daylight saving time changeover in September 2022. At least for Windows 10/11, Microsoft already warns the user community that "strange" behavior could occur. This becomes a problem in international networks, where computers are connected to systems in Chile, or when meetings from and with Chile are scheduled from abroad. The background is that Chile has shifted the date for the daylight saving time change from September 4 to September 10, 2022.

Daylight saving time shift in Chile

The information can be found in the Windows status area in the Known Issues section of affected versions such as Windows 11 and Windows 10(21H2). As of September 6, 2022, Microsoft has left the following information there:

• Starting Saturday, September 10, 2022, 12:00 p.m., the official time in Chile will be advanced by 60 minutes. This corresponds to the official announcement of the Chilean government on August 9, 2022 about the change of the time zone to Daylight Saving Time (DST).
• This moves the DST changeover, which was previously on September 4, to September 10. I interpret it to mean that Microsoft has already received corresponding error messages from Chile.

Microsoft has been catched on the wrong foot, because Windows 10 and Windows 11 (as well as older versions and the server counterparts) are set to have the DST changeover on September 4, 2022 (and that date is known to have passed).

There could be issues

Since computers are often also integrated into networks, it can lead to problems with network traffic across country borders. Specifically, Microsoft therefore sees the following problems coming to users between September 4 and September 10, 2022 (those who are affected should already have noticed).

• The time displayed in Windows and apps is not correct.
• Apps and cloud services that use date and time for essential features, such as Microsoft Teams and Microsoft Outlook, notifications, and meeting scheduling, may be off by 60 minutes.
• Automations that use date and time, such as scheduled tasks, may not run at the expected time.
• Timestamps on transactions, files, and logs differ by 60 minutes.
• Operations that rely on time-sensitive protocols, such as Kerberos, might experience authentication failures when attempting to log in or access resources.

Microsoft notes that Windows devices and applications outside of Chile may also be affected. This is true if these systems or applications connect to servers or devices in Chile. Problems can also be expected if users schedule or attend meetings in Chile from another location or time zone.

Workaround for devices in Chile

Microsoft is giving a workaround for devices running Windows in Chile, however. Users must disable the "Automatically adjust clock to daylight saving time" option in the Time and Date properties under Windows before September 4, 2022 12:00. Then there will be no automatic changeover by Windows.

On September 10, 2022, this option must then be enabled in the Time and Date properties in order to switch to daylight saving time. For the Santiago time zone, a workaround is to be done after September 11, 2022, 12:00 AM, and in the Easter Islands time zone after September 10, 2022, 10:00 PM. Details can be found in Microsoft's status report for Windows 11 and Windows 10. Windows devices outside of Chile should not use the workaround, as it would change the local time on the device. (via)