Get timezone from a country

Can anyone tel me how to get a timezone name from city and country name? Any webservice link also will suffice my need..

For eg, Input : Bangalore, India

O开发者_高级运维utput is : IST

Thanks.

http://www.timeanddate.com/worldclock/search.html

Enter just the city name and it will give you all kinds of information, including the time zone.