compByDate.js

var article1 = {
    id: 1,
    createdAt: new Date('2012-04-04T24:00:00')
};

var article2 = {
    id: 1,
    createdAt: new Date('2014-04-04T24:00:00')
}

var article3 = {
    id: 1,
    createdAt: new Date('2010-04-04T24:00:00')
}

var articles = [article1, article2, article3];
console.log(articles);

articles.sort(function (a, b) {
    if (a.createdAt - b.createdAt < 0) {
        return 1;
    } else {
        return - 1;
    }
});

console.log(articles); // article3, article1, article2