multiple day events modification

<?php
$date = get_post_meta($post->ID, 'date', true);
$end_date = get_post_meta($post->ID, 'end_date', true);
if ($end_date){
echo 'This event will be held from '.$date. ' to '.$end_date;
}
else if($date){
echo 'This event will be held on: '.$date;
}
?>