title: How to convert YouTube API duration (ISO 8601 duration in the format PT#M#S) to seconds
body: <p>How can I manipulate a date time in the format PT#M#S with JavaScript?</p>
  
  <p>for example: <code>PT5M33S</code> </p>
  
  <p>I'd like to output as <code>hh:mm:ss</code>.</p>