how to parse timestamp in javascript code example

Example: time stamp to date js

var myDate = new Date("Jul 21, 2013");
var date = myDate.getDate();
var month = myDate.getMonth();
var year = myDate.getFullYear();

function pad(n) {
	return n<10 ? '0'+n : n
}

var ddmmyyyy = pad(date) + "-" + pad(month + 1) + "-" + year;