title: ERROR Warning: date() expects parameter 2 to be long, string given in
body: <p>I get i this error on the nextgen-gallery/lib/meta.php on line 522</p>
  
  <p><em><code>ERROR Warning: date() expects parameter 2 to be long, string given in</code></em></p>
  
  <p>This line includes: </p>
  
  <pre><code>$date_time = date( 'Y-m-d H:i:s', $date_time );
  </code></pre>
  
  <p>How can i resolve this?</p>