Set my locale in iphone

I am doing an application which user count down timer. The timer works fine with my simulator. but when i install it in to my device the timer is showing some time difference. Hope its the problem with locale. Can any one provide me some help to fix this problem.?? Please...

Thanks in Advance, Shibin开发者_JAVA技巧

Without more information, it's hard to answer your question, but almost surely the Date and Time Programming Guide for Cocoa will be able to help you.