title: Date Format for String
body: <p>I have a string of the form "2013-05-12T15:38:20+00:00" but I can't work out why my date formatter won't convert it to an NSDate object. I have tried using "yyyy-MM-ddTHH:mm:ss+zz:zz" and a bunch of variations on it but no luck.</p>
  
  <p>What would be the correct date format for this string?</p>
  
  <p>Thanks</p>