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:
The date is \"2010-02-24 12:30:00 -1000\"
duration is 3600

Answer 1

For those looking for a Swift 3.x version:

let newDate = Date.init(timeInterval: 2600, since: oldDate)