date conditional (help!?)

i am stumped. :-/
i am trying to add a conditional for my posts stating basically the following:

if this post was entered more than 2 weeks ago then do nothing.

if it is newer than 2 weeks ago then echo “new”.

i for the life of me cannot figure it out.
surely someone can help me with this one?
i am sure it’s basic php.

here is the code that it will reside in:

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div class=”thumb”>
“><?php the_excerpt(); ?>
<span class=”thumbClient”><?php the_title(); ?></span>
<div class=”newPost”>

//new post conditional here

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