add code to the email template file Blank_4.php to change the date format back:
<?php
if(isset($_POST['PreferredDate'])) $_POST['PreferredDate'] = date("d-m-Y", strtotime($_POST['PreferredDate']));
?>
<?php
if(isset($_POST['PreferredDate'])) $_POST['MotExpiry'] = date("d-m-Y", strtotime($_POST['MotExpiry']));
?>