title: Convert string to a epoch time in Excel
body: <p>I am trying to convert string in following format: <code>20130817T140000Z</code>(17th Aug 2013 at 14:00) to <a href="http://en.wikipedia.org/wiki/Unix_time" rel="nofollow">epoch time</a> (seconds since 1970) in an MS Excel 2013.</p>
  
  <p>Tried cell formatting, but it doesn't work with <code>T</code> and <code>Z</code> or the format in general.</p>