theming custom date field

This site is still in development, the address is http://fluid.ipwa.net/. There you will see that the date for the events is themed. I did a content type called eventos that had a date CCK field. I themed that content type using a a template file called node-evento.tpl.php, this is my code for that file:

<div class="<?php print $node_classes ?>" id="node-<?php print $node->nid; ?>">
  <?php if ($page == 0): ?>
    <h2 class="title">
      <a href="<?php print $node_url ?>"><?php print $title; ?></a>
    </h2>
  <?php endif; ?>

  <?php if ($picture) print $picture; ?>  
  
  <?php if ($submitted): ?>
    <span class="submitted"><?php print t('Posted ') . t(' by ') . theme('username', $node); ?></span> 
  <?php endif; ?>

  <?php if (count($taxonomy)): ?>
    <div class="taxonomy"><?php print t(' in ') . $terms ?></div>
  <?php endif; ?>
  
  <?php
    // Since the cck date field is not in UNIX timestamp format, convert first
    $timestamp = strtotime($field_time[0]['value']);
    $month = format_date($timestamp, 'custom', 'M');
    $day = format_date($timestamp, 'custom', 'd');
  ?>
  <div class="content">
    <div class="post-date"><span class="post-month"><?php print $month; ?></span>
      <span class="post-day"><?php print $day; ?></span>
    </div>
    <?php print $content; ?>
  </div>
  
  <?php if ($links): ?>
    <div class="links">
      <?php print $links; ?>
    </div>
  <?php endif; ?>
 
</div>

This is the CSS used for the dates :

.post-date {
	width: 48px;
	height: 43px;
	float:left;
	margin-right: 10px;
	margin-bottom: 10px;
	background: url(images/date-bg.gif) no-repeat;
}
.post-month {
	font-size: 11px;
	text-transform: uppercase;
	color: #FFFFFF;
	text-align: center;
	display:block;
	line-height: 11px;
	padding-top: 4px;
	margin-left: -3px;
}
.post-day {
	font-size: 18px;
	text-transform: uppercase;
	color: #000;
	text-align: center;
	display:block;
	line-height: 18px;
	padding-top: 4px;
	margin-left: -4px;
}

Make a date icon in Photoshop that is 48 x 43 to use as the background for the date, you can use my icon as a base to make your own that suits you colour scheme, but please don't use mine in your site. I can send you the source Photoshop file if you want so you make your own but it is really simple to make it from scratch. Imro0k was the one that helped me to theme the CCK dates because before the date that was themed was the date when the node was created. I'm going to make a tutorial on how to make events for your site using this method for www.mulpo.com/, I'll post the link here when it's ready.

Thank you so much imrook, your code was missing a simple ")". I feel like I have learned something really cool today, it will help me for many other projects. Thanks man you really sorted me out!

so the code that works is:

<?php
  // Since the cck date field is not in UNIX timestamp format, convert first
  $timestamp = strtotime($field_time[0]['value']);
  $month = format_date($timestamp, 'custom', 'M');
  $day = format_date($timestamp, 'custom', 'd');
?>
<div class="content">
  <div class="post-date"><span class="post-month"><?php print $month; ?></span>
    <span class="post-day"><?php print $day; ?></span>
  </div>
  <?php print $content; ?>
</div>