title: Add one hour to PHP variable with date
body: <p>The title says it all. I have a PHP variable that says: <code>07/05/2016</code>.</p>
  
  <p>I've tried <code>strtodate</code>, the <code>date</code> function, but nothing seems to be working. <strong>How can I now add one hour to this date?</strong></p>