The September 2020 Cumulative Update Preview for Windows 10 includes the following correction to the Daylight Saving Time (DST) end date for Fiji:
DST will end in Fiji on January 17, 2021. Due to defined rules in Windows, however, this date is noted in Windows as January 10, 2021, which is incorrect. Installing the September 2020 Cumulative Update Preview (or later) for Windows 10 will fix this issue and ensure that end user devices experience the correct DST transition on January 17th.
This correction is for devices running the following versions of Windows 10:
Windows 10, version 1809
Windows 10, version 1903
Windows 10, version 1909
Windows 10, version 2004
Devices running other supported versions of Windows will see the relevant changes in the October 2020 monthly quality update.