Add this function to your <script></script>
and call from where ever you want in that <script></script>
<script>
window.alert(Getnow());
function GetNow(){
var currentdate = new Date();
var datetime = currentdate.getDate() + "-"
+ (currentdate.getMonth()+1) + "-"
+ currentdate.getFullYear() + " "
+ currentdate.getHours() + ":"
+ currentdate.getMinutes() + ":"
+ currentdate.getSeconds();
return datetime;
}
</script>