Date not showing on pages:

Hi, I have recently decided to display the date my pages were last updated but the date does not display.

This is my page.php:

<?php get_header(); ?>
<link href="style.css" rel="stylesheet" type="text/css">
<div class="header">
<?php the_title(); ?>
</div>
Last Updated: <b><?php the_date(); ?></b><br>
<div id="content" class="narrowcolumn">

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div class="post" id="post-<?php the_ID(); ?>">
<div class="entrytext">
<?php the_content('<p class="serif">Read the rest of this page '); ?>

<?php link_pages('<strong>Pages:</strong> ', '', 'number'); ?>

</div>
</div>
<?php endwhile; endif; ?>
</div>

What is wrong?