title: Timestamp to normal date format and reverse conversion using PHP
body: <p>I have a timestamp as <code>2011-08-27 18:29:31</code>. I want to convert it to <code>27 Aug 2011 06.29.31 PM</code>. Also, I want to convert this format reverse back to the previous timestamp format.
  How van I do this using PHP?</p>