title: Concatenate Two NSDate String values
body: <p>I just confused that is there any default functionality for concatenating two NSDate values like 11-jan-2012 and 15-jan-2012 as 11-15-jan-2012.
  also 11-jan-2012 and 15-jul-2012 as 11-jan-15-jul-2012.
  Thx in Advance.</p>