Rumored to be the best parser, validator, manipulator, and displayer of dates in JavaScript on the planet. I did a google site search on AutoHotkey.com and didn't see it, so I thought I'd post it.
Lots of examples on the author's page including: Format Dates, Relative Time, Calendar Time, and Multiple Locale Support.
Dozens of languages to choose from including Esperanto and 4 flavors of English.
Moment.min.js tips the scales at 34kbs, at least it tipped my scale at 34kbs, but my scale hasn't seen much use since ... uhmmm ... [cough] ... the early 70s, so your mileage may vary.