countdown timer implementation in UILabel?

I am Implementing a countdown time开发者_Go百科r in my app. In the functionality, I need to display the remaining time before Jan 1st 2011. In months, days, hours and minutes format. Can any one please help. Thanks in advance.

use an NSTimer which update you're label everytime it's fired

http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSTimer_Class/Reference/NSTimer.html