date.parse string to javascript

var myDate = new Date("2013/1/16");

var str = "2013/1/16";
var strToDate = new Date(str);var d = Date.parse("March 21, 2012");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