There seems to be a bug in windows server 2019 that doesn’t allow time zone change.
In order to change the time zone, go to command line in elevated administrator role.
run:
tzutil /l
This will list all the time zones, copy the time zone you want and run the following command:
tzutil /s “Eastern Standard Time”
In this case I selected “Eastern Standard Time” You need to pick the zone you’re in.
If this helped you please please consider buying me coffee! Thanks in advance!