How to add a time interval to an NSDate

Question

I have an NSDate and a duration. I need to get the time after the duration...

Given: NSDate is 2010-02-24 12:30:00 -1000 duration is 3600 secs

I need to get 2010-02-24 13:30:00 -1000

Actually I am looking for the time, but I think I know how to do that if I can get the NSDate object reflecting the new time.

I thought dateWithTimeIntervalSinceReferenceDate would do the trick but I see now that this gives date from 1 jan 2001 gmt.

Is this another c function I need to use?

Thanks for any help.

John

Answer 1

You want the class method dateWithTimeInterval:sinceDate: which takes the starting date and the interval NSDate docs

Answer 2

You can use the addTimeInterval instance method of NSDate:

NSDate *newDate = [oldDate addTimeInterval:3600];

Edit: As Chip Coons correctly points out, this method has been deprecated. Please use one of the other methods instead.

Answer 3

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.