This is inspired by both Threeten [1] and Joda-Time [2], which are well-engineered Java libraries for date/time concepts.<p>I have often wished for that API to be available in other environments, so this is definitely a welcome addition to JS.<p>Note that the authors of the library are confused -- Threeten-(backport) and Joda-Time are different libraries with different behaviors, and one isn't an "aka." for another. However, Joda-Time's author went on to develop Threeten based on lessons learned, and this library purports to be a JS port of Threeten-Backport.<p>[1] <a href="https://github.com/ThreeTen/threetenbp" rel="nofollow">https://github.com/ThreeTen/threetenbp</a><p>[2] <a href="http://www.joda.org/joda-time/" rel="nofollow">http://www.joda.org/joda-time/</a>