title: Oracle: Calculate time difference in HH:MM:SS between 2 dates
body: <p>I have 2 dates with following format:</p>
  
  <p>ST_DT = Sun Dec 29 11:55:29 EST 2013</p>
  
  <p>ED_DT = Tue Dec 30 20:21:34 EST 2013</p>
  
  <p>I want to find the difference between these 2 dates in HH:MM:SS format. Now my problem is that i don't know how to parse the above date format in Oracle.</p>