Sugar
A Javascript library for working with native objects
...The date module parses, formats, and manipulates dates and supports many locales. Sugar blends in with native methods, and defers to their implementations when possible. A comprehensive polyfill suite patches browser support when it is broken or missing. As of v2.0, native extension has become opt-in while supporting two new ways of interacting with the library. Sugar still believes in the safe extension of natives, however there are times when this is not appropriate, and this choice is now put in the hands of the user. Custom browser builds can be created on the site download page. ...