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***PUT THIS INSIDE THE LOOP, FIRST THING***
<?php  //to check against expiration date;

$currentdate = date("Ymd");
$expirationdate = get_post_custom_values('expiration');
if (is_null($expirationdate)) {
$expirestring = '30005050'; //MAKE UN-EXPIRING POSTS ALWAYS SHOW UP;
} else {

if (is_array($expirationdate)) {
$expirestringarray = implode($expirationdate);
}
$expirestring = str_replace("/","",$expirestringarray);
} //else
if ( $expirestring > $currentdate ) { ?>

***THEN PUT THE FOLLOWING LINE AT THE VERY END OF THE LOOP***

<?php } //end if for expiration; ?>

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