One nice addition to Windows Vista is the ability to display the time in other time zones.

   1. Click on the clock.
   2. Click "Date and Time Settings".
   3. Click on the "Additional Clocks" tab.
   4. Check the box labelled "Additional Clock #1″, and from the drop down menu choose a time zone.
   5. Give the clock a name, such as "Microsoft" or "Texas".
   6. Press OK.

You can repeat this for the second additional clock as well.

i'm talking abiut vista my dear.....read it carefully

riteshHowToDo wrote r u talking abt XP or VISTA i have not found any such setting under XP

He is talking about Vista. !!!! You can add two more clocks with different time zones.