Cron job to call php to email last 24 hours posts

We have been trying to call via CronJob a php script that will email the past 24 hours posts using the ‘post_type’ = ‘reservations’ filter.

Below we have been using some script from a previous forum post but just cannot get it to work, the emails are coming through blank.

<?php 

    function filter_where($where = ”) {
    $where .= ” AND post_date > ‘” . date(‘Y-m-d’, strtotime(‘-1 days’)) . “‘”;
   return $where;
}
add_filter(‘posts_where’, ‘filter_where’);
$args = array(
   ‘paged’–> $paged,
   ‘post_type’ => ‘reservations′
);
query_posts($args);
?>

Any php gurus out there that could shed some light on this, or is there an easier way?