I have an
As DyingCactus states, you can use the addTimeInterval method of NSDate, but depending on the OS version is will create a compiler warning, since it is deprecated in 10.6 as of 2009-08-17.
The current recommended method is to use dateByAddingTimeInterval on NSDate:
NSDate *newDate = [oldDate dateByAddingTimeInterval:3600];
Note that if you are targeting 10.5 or earlier, the original answer will work.