Add $submitted variable back into node.tpl

The submitted date format of a node is hard coded into node.tpl.php of Zen theme.
So, even if one adds the custom theme function interactive_media_node_submitted($node) into template.php, it doesn't work.

I think it is important to know the submitted and last modification date of a node, so I modified template.php and node.tpl.php as following:

1. diff template.php.original template.php
   217a218,233
   > 
   > 
   > /**
   >  * Override the submitted info of a node.
   >  * It shows the last modification date when this one differs from the creation date.
   >  */
   > function interactive_media_node_submitted($node) {
   > 	$data = array(
   > 				'!username' => theme('username', $node),
   > 				'@datetime' => format_date($node->created,'medium'),
   > 				'@updatedate' => format_date($node->changed,'medium')
   > 			);
   > 
   > 	return t('Submitted by !username on @datetime'.(($node->created != $node->changed)?'; last update on @updatedate':''), $data);
   > }
   > 
   

2. I have copied the Zen templates/node.tpl.php into templates and modified as
   

   diff ../../zen/templates/node.tpl.php node.tpl.php 
   89,96c89,91
   <       <?php if ($display_submitted): ?>
   <         <span class="submitted">
   <           <?php
   <             print t('Submitted by !username on !datetime',
   <               array('!username' => $name, '!datetime' => $date));
   <           ?>
   <         </span>
   <       <?php endif; ?>
   ---
   > 	  <?php if ($submitted): ?>
   > 		<span class="submitted"><?php print $submitted ?></span>
   > 	  <?php endif; ?>