//In comparison, Date object is converted to number
var d = new Date();
var s1 = "Thu Mar 27 2008 14:57:11 GMT+0800 (CST)";
var s2 = "Thu Mar 27 2099 14:57:11 GMT+0800 (CST)";
var n1 = d.valueOf() - 1000;
var n2 = d.valueOf() + 1000;
console.log(d > s1);//false, d is converted to number, and that number is further converted to string. It is a string comparison here.
console.log(d > s2);//false
console.log(d > n1);//true
console.log(d > n2);//false

console.log("11" > 3);//true