to store the date in the database, it needs to be converted to the
yyyy-mm-dd format.
add the following code at line 1 to do the formatting:
<?php
if(isset($_POST["Registration_group_19_Date_of_Birth"])) {
$_POST["Registration_group_19_Date_of_Birth"] = date("Y-m-d", strtotime($_POST["Registration_group_19_Date_of_Birth"]));
}
?>