Using Conditional tags

Hi all!

I’ve got a slight problem here. Here’s some code I’m working on.

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

<div class="post" id="post-<?php the_ID(); ?>">
 <div class="titles">
  <h2><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h2>
<strong><h3><?php if (is_category('4')){
		the_time('Y');
	} else {
		the_time('m.d.Y');
	} ?></h3></strong>
	</div>
    	<div class="storycontent">
		<?php the_content(__('(Read More)')); ?>
		</div>
</div>
<?php endwhile; else: ?>
<p><?php _e('Sorry, no posts matched your criteria.'); ?></p>
<?php endif; ?>

My problem is why isn’t the conditional statement doing its job and displaying only the year when the post is in category 4 or the entire date when its in category 5? Here’s the page I’m working on. The Events tab is category 5 and the Projects tab is category 4.

Thanks so much,
Eric Huang