title: How can I convert including timezone date in swift?
body: <p>I want to convert <code>2015-08-14T20:02:25-04:00</code> to <code>2015-08-14 16:02</code><br>
  I tried below, but it could't execute well(returned nil).</p>
  
  <pre><code>let d = "2015-08-14T20:02:25-04:00"
  let formatter = NSDateFormatter()
  formatter.dateFormat = "yyyy-MM-dd HH:mm:ss ZZZZ"
  let date: NSDate? = formatter.dateFromString(d)
  </code></pre>
  
  <p>How can I convert this date format?</p>