title: Covert my date to hours and days
body: <p>Hi i need covert date to hours and days </p>
  
  <p>My date format is like this : 2013-09-01 22:15:59</p>
  
  <p>I need to show like this within 24 hours (hours) :<strong>(12 hours back)</strong></p>
  
  <p>I need to show like this after 24 hours (days)  :<strong>(5 days back)</strong></p>