This hack comes becomes very useful when you are running a contest because you might be posting information such as clues or hints that you don’t want to stay up for ever. Instead of manually removing the article, you can just make it expire automatically. It also works if you have a product that you are offering a discount on. You posted it on your blog, but you don’t want that discount to stay on your blog after its over. So you can remove it automatically with this code.

All you need to do is replace your WordPress Loop with this code:

<?php
 if (have_posts()) :
 while (have_posts()) : the_post();
 $expirationtime = get_post_custom_values('expiration');
 if (is_array($expirationtime)) {
 $expirestring = implode($expirationtime);
 }
 $secondsbetween = strtotime($expirestring)-time();
 if ( $secondsbetween > 0 ) {
 the_title();
 the_excerpt();
 }
 endwhile;
 endif;
?>