I got it now. I R<sup>2</sup> it with this code:
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<div class="post">
<div class="post_cal">
<?php
$postraw = the_date('D, j, M, y', '', '', FALSE);
if ($postraw != '') {
$postdate = explode(', ', $postraw);
} ?>
<div class="dayname"><?php echo $postdate[0]; ?></div>
<div class="daynum"><?php echo $postdate[1]; ?></div>
<div class="month"><?php echo $postdate[2]; ?> '<?php echo $postdate[3]; ?></div>
<div class="year">