Here is a great hidden command line utility which is available starting in Windows 7, “tzutil.exe,” which can be used to view or change the computer’s Time Zone. To use this command:

1. Open the Command Prompt.
2. Enter any of following commands:

tzutil /g (To view current time zone)
tzutil /l (To get a list of all available time zones)
tzutil /s time_zone_ID (To change time zone)

time_zone_ID is the new time zone you want to set. Fox example, if you want to set the time zone to “Eastern Standard Time”, then the command would be:

tzutil /s “Eastern Standard Time”

See also Set Time Zone From Command Line in Windows 2003, XP and 2000