datepicky.js is a standalone javascript date picker, i.e. it has no library dependencies. While supporting the only date format that matters, ISO 8601 (YYYY-MM-DD), datepicky.js behavior can be easily customized for various use cases. It has been tested in IE6, IE7, IE8, IE9, FF5, Chrome 14, Safari 5, Safari iOS 4.3, and Opera 11.5.
Demo of all possible customizations.