Moment.js

A lightweight javascript date library for parsing, manipulating, and formatting dates.

Get it

npm install moment
Production Version 1.4.03.3kb minified & gzippedDevelopment Version 1.4.022.6kb full source + comments

Use it

var now = moment();
console.log(now.format('dddd, MMMM Do YYYY, h:mm:ss a'));

var halloween = moment([2011, 9, 31]); // October 31st
console.log(halloween.fromNow());

var now = moment().add('days', 9);
console.log(now.format('dddd, MMMM Do YYYY'));

var now = moment();
moment.lang('fr');
console.log(now.format('LLLL'));