GOOGLE SERP Description Including Date From Blog

Hi,

On the Google description it is including a date at the start of the text.

e.g.

“25 Feb 2011 … The leading UK product photography studio Digital Exposure specialises in creative and packshot product photography for print and for web.”

I have my homepage to include my latest three blog posts so this is where it is coming from. The date changes each time I post a new entry.

The php code I use to include the posts is;

<ul class="posts">
						<?php
							require('blog/wp-blog-header.php');
						?>
						<?php query_posts('showposts=3'); ?>
						<?php while (have_posts()) : the_post(); ?>
						<li><a href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><b><?php the_title(); ?></b></a><br /><?php twentyten_posted_on(); ?></li>
						<?php endwhile;?>
					</ul>

Has anyone any clue how to stop Google doing this?

Thanks