We work with airlines and timestamp change on the fly so to get the correct reliable locale this is a great addition to our library.

Date parsing in JavaScript has always been a major difficulty and it is something that I have to deal with often. Moment.js' parsing capabilities is robust and behaves consistently across all major browsers. Also, "time until" and "X minutes ago" labels used to be just a Twitter thing. Nowadays, every timestamp is expected to read like this. Moment.js makes this super simple too!

If you, like me, hate having to use the Javascript native object for date formatting and manipulation, but you still need it for your website, you'll be hard pressed to dins a more useful tool than Moment.js. From the moment I discovered it (pun intended) it has been my life saver for avery site where I need to display nicely formatted dates. What I like best is that I can feed it the raw date object from the database, and decide later how I want it displayed for the viewer, so I won't give it a second thought. And the most useful feature is relative time (a moment ago, two days ago etc.), that gives immediate, meaningful information to the reader.