Twix is a comprehensive JS library for working with date ranges, and includes a customizable smart formatter. It's written in CoffeeScript and it depends on Moment.js.

Some examples:

var t = moment("1982-01-25T09:30").twix("1982-01-25T13:30");

t.format();  //=> Jan 25, 1982, 9:30 AM - 1:30 PM

t.isSame("day"); //=> true
t.humanizeLength(); //=> "4 hours"
t.count("days"); //=> 1
t.intersection(otherRange); //=> another range

See the documentation for more.

You can find comprehensive docs here:

Detailed documentation

Breaking change in 1.0.0: Removed the deprecated showYear and showDate smart formatter options. Use hideYear, hideDate, implicitYear, and implicitDate instead.

If you want to build and test Twix for yourself, make wraps everything you need:

Patches are welcome!

• Don't include your changes to the generated .js files in the patch; they're much harder to merge. I'll generate them when I cut the release.
• Make sure you run the linter and the tests before submitting a PR. Use make lint and make test.
• If you make a change that will need documentation, make the appropriate update to docs. It will get published to the website on the next release.

CHANGELOG

Copyright 2012-2015 Isaac Cambron and contributors. Distributed under the MIT License. See LICENSE for details.