how to get date string from date object in javascript code example

Example 1: convert date to string javascript

var d = new Date();
  var n = d.toDateString();

Example 2: string date to date in javascript

var ts = '1471793029764';
ts = Number(ts); // cast it to a Number
var date = new Date(ts); // works

var invalidDate = new Date('1471793029764'); // does not work. Invalid Date