Adding Additional Clocks 

By using this trick we can see clocks for different cities. To make this work on Windows
7, click the clock icon in your system tray. Choose Additional Clocks in the windows that
pops up and add the additional cities you want. Unfortunately, the additional times don’t
exactly get displayed in your tray — you need to hover over the clock.

Steps :
o Click on the clock icon present in the system tray.
o Click on Change date and time Settings. . . option.
o Click on Additional Clocks Tab.

o The clocks for different cities will appear.