使用fooTable中的formatString，PHP日期输出是相同的

I am having problem to the footable because whenever i use the data-format-string in footable the output becomes the same.

 <table id="table" data-paging="true" data-sorting="true">
 <thead>
      <tr>
         <th data-name="date_from" data-type="date" data-format-string="MMM DD YYYY">Date</th>
         <th data-name="title">Title</th>
         <th data-name="venue">Venue</th>
        <th data-name="activity_id">View</th>
     </tr>
     </thead>
      <tbody>
        <?php
           $myqry=$db->prepare("SELECT activity_id,date_from,title,venue FROM activity" );
           $myqry->execute();
           $anotherarray=array();
           while($myqr=$myqry->fetch(PDO::FETCH_ASSOC)){
                 echo '<tr><td>'.$myqr['date_from'].'</td>
                 <td>'.$myqr['title'].'</td>
                 <td>'.$myqr['venue'].'</td>
                 <td><a href="view_act.php?actvid='.$myqr['activity_id'].'">View</a></td></tr>';
           }                              
       ?>
 </tbody>
 </table>

What I expect:

this is i expect to see in my date column

What I get:

this is what i get

Solved this question. I converted my date using strtotime then multiplied it by 1 milliseconds. My reference was Pass Datetime/Timestamp from PHP to Javascript by echo the one that Travesty3 answered. This is my php code now

<?php
    $myqry=$db->prepare("SELECT activity_id,date_from,title,venue FROM activity" );
    $myqry->execute();
    while($myqr=$myqry->fetch(PDO::FETCH_ASSOC)){
      $mydate=strtotime($myqr['date_from'])*1000;
      echo '<tr><td data-value="'.$mydate.'"></td>
          <td>'.$myqr['title'].'</td>
          <td>'.$myqr['venue'].'</td>
          <td><a href="proc_view_act.php?actvid='.$myqr['activity_id'].'">View</a></td></tr>';
    }