JSFiddle - React, Tailwind, and code Playground

JavaScript

var myArray = ["Mon, 02 Mar 2015 14:15:47 GMT", "Tue, 03 Mar 2015 14:15:47 GMT", "Sun, 01 Mar 2015 14:15:47 GMT"];
function compNewestFirst(a, b) {
  return new Date(b).getTime() - new Date(a).getTime();
}

myArray.sort(compNewestFirst)

alert(myArray);