How to write a program for Time Zones?

I want to create a GUI using C, for displaying time when a time zone is selected.

I absolutely don't know how to write a program for that. Can you please guide me how to get the time of a zone displayed when the zone name is given as input.

Thank You.

Sarath Karanam.

Have you read the documentation for the stuff in the time.h header? Specifically, a tm object returned by gmtime can be adjusted from UTC to other time zones with relative ease (see the example for gmtime). From there it's a simple matter of working out the time zone offset from UTC for the name given. But that can be a straight table lookup.

Thank you Prelude :)