<script type="text/javascript">
        function insertDate() {
            var date = new Date();
            var year = date.getFullYear().toString();
            var month = prependZero((date.getMonth() + 1).toString());
            var day = prependZero(date.getDate().toString());
            var formattedDate = day + "." + month + "." + year;

            var dateField = document.getElementById("knapp");
            dateField.innerHTML = formattedDate;

        }

        function prependZero(numberStr) {
            if (numberStr.length == 1) {
                return "0" + numberStr;
            }
            return numberStr;
        }

    </script>