Tantek Çelik's NewBase60, lightly translated from the original CASSIS to CommonsJS- & Node.js-aware JavaScript by Edward O'Connor.
Then translated once more to a more usable Node.js module that implements Date conversion similar to that of Shane Becker's NewBase60. NewBase60.js by Michael Owens. Published on NPM as newbase60.
Released under CC BY-SA 3.0.