It was nice after extracting `parseDate()` to see that only `toString()` and `parseDate()` use moment (other than `set/getMoment()` of course), which made me realise it would be trivial for users to override these functions on the Pikaday.prototype to use other JS Date libraries. I create the Sugar example to show how this might be done as Sugar's Date.create() extension includes a natural language parser.  This nicely broadens the Pikaday community to those who don't want to use moment.js.