Develop GMT and UTC Time Zones

Question

Hi all..

GMT - Greenwich Mean Time.

UTC - Universal Time Coordinated.

How to develop a webpage so that User can see different timezones of different countries ??

Or.. User can select a particular country and see its time.

Eg -
Time of India and Australia are different.
When it is 7pm in India, it is 12am at Australia.


Also...How to show a watch - Circle or Rectangle shape on screen (12hrs and 24hrs) clock ??

The watch should have numbers from 1 to 12 in round way... and hour-hand, minute-hand, second-hand.

Please guide.