1. Open command prompt as administrator.
2. Run command tzutil /s "name of time zone"
2a. Running command tzutil /l will list all time zone names if you dont know the names.
3. If the command goes through but the time zone doesnt change: run the following commands and then try running the tzutil again
net stop w32time
w32tm /config /syncfromflags:manual /manualpeerlist:"0.it.pool.ntp.org 1.it.pool.ntp.org 2.it.pool.ntp.org 3.it.pool.ntp.org"
net start w32time
w32tm /config /update
w32tm /resync /rediscover
Only should be used if you're unsure which category to use.