Timestamp in JS (yuk)

timestamp.js

function timeStamp() {
   var d = new Date();
   var hour = ('0' + d.getHours()).slice(-2);  
   var min = ('0' + d.getMinutes()).slice(-2);  
   var sec = ('0' + d.getSeconds()).slice(-2);  
   var mil = ('000' + d.getMilliseconds()).slice(-3);
   return hour + ":" + min + ":" + sec + "(" + mil + ")";
}