Setting a correct time zone in Windows is important because it is used to decide the daylight saving time settings. When Windows contacts the NTP time servers to keep the date and time updated, it also uses the time zone setting to convert the server time into local time. Windows Vista asks and sets the time zone during the installation, but you can change it at a later point too. Here is how :
- Press the key combination Windows logo key + R to open the Run dialog.
- Type timedate.cpl in the Run dialog and press Enter.
- In the Date and Time window, select the Date and Time tab if not pre-selected.
- Click on the Change time zone… button as shown,
- From the drop-down list labeled Time zone : select a time zone as shown,
- Click OK to save the chanegs.