Editor's note (3.31.2023): This article has been updated to provide additional clarity and guidance on time-zone mapping, and to include links to the KB articles offering the time zone fix.
As ...
Updated Mar 31, 2023
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We have several Windows 10 systems in Mexico City. We have updated those PCs to 22H2 and when I examine the timezone data stored in the registry at HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Time Zones\Central Standard Time (Mexico) and the lower Dynamic DST leaf I can see that in 2023 the entry indicates that daylight saving time is not used in this timezone.
However, when I open powershell and use get-timezone to display data for the 'Central Standard Time (Mexico)', it shows that 'SupportsDaylighSavingTime' is set to True.:
get-timezones -name 'Central Standard Time (Mexico)'
Id : Central Standard Time (Mexico)
DisplayName : (UTC-06:00) Guadalajara, Mexico City, Monterrey
StandardName : Central Standard Time (Mexico)
DaylightName : Central Daylight Time (Mexico)
BaseUtcOffset : -06:00:00
SupportsDaylightSavingTime : True
This seems incorrect. The registry data correctly shows no support for DST in the Central Standard Time (Mexico) zone but get-timezone incorrectly shows that the zone supports DST.