The January 2021 Cumulative Update Preview release for Windows includes the following historical Daylight Savings Time (DST) corrections for the Palestinian Authority:
- The 2015 DST end date was October 23, 2015 instead of October 22, 2015.
- The 2019 DST end date was October 23, 2019 at 00:00 instead of 01:00.
- The 2020 DST start date was March 28, 2020 instead of March 27, 2020.
- The 2020 DST end date was October 24, 2020 instead of October 31, 2020.
This change is for devices running the following Windows 10 versions:
- Windows 10, version 1809
- Windows 10, version 1903
- Windows 10, version 1909
- Windows 10, version 2004
Customers running devices with other supported versions of Windows will see the relevant changes in the February 2021 monthly quality update.
For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.