title: Difference between two NSDate objects -- Result also a NSDate
body: <p>I have two NSDate objects and I want the difference between the two and the result should again be a NSDate object. Any idea how to achieve this?</p>
  
  <p>Here, I am trying to address a unique problem where I have to find out the elapsed time and then localize the elapsed time. I can localize it if I have the elapsed time in NSDate object. So thought of creating a NSDate object which has its time component same as time interval between the two dates so that I could use NSDateFormatter to localize it.</p>