How to compare two dates in iphone?

Question

I want to compare the todays date and other date coming from my database. For example, 2011-03-25 compare it with 2011-02-25

How can i formate my database date as t

Answer 1

http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/DatesAndTimes/Articles/dtDates.html#//apple_ref/doc/uid/20000183-BCIDBADB

Isn't that the same on Iphone?