PHP-Code:
function format_form2date ($year, $month, $day) {
$year = intval($year);
$month = intval($month);
$day = intval($day);
if ((checkdate("$month", "$day", "$year")) <> "") {
$string = $year . "-" . $month . "-" . $day;
} else {
$string = "";
}
return $string;
}
versuchs mal damit.