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!