var timer = function(name) {
    var start = new Date();
    return {
        stop: function() {
            var end  = new Date();
            var time = end.getTime() - start.getTime();
            console.log('Timer:', name, 'finished in', time, 'ms');
        }
    }
};

var t = timer('Moment'); for(var i=0; i < 10000; i++){ moment().year(); } t.stop();
// Moment finished in 88 ms
var t = timer('Vanilla'); for(var i=0; i < 10000; i++){ new Date().getFullYear(); } t.stop();
// Vanilla finished in 6 ms