<?php
$ts = strtotime($bd);

$now = time();
$now->setTime( 0, 0, 0 );
$match_date = $ts;
$match_date->setTime( 0, 0, 0 );
$diff = $now->diff( $match_date );
$diffDays = (integer)$diff->format( "%R%a" );


switch( $diffDays ) {
case -1:
return true;
break;
default:
return false;
}

?>