MooTools DatePicker is highly configurable date picker component with smooth animation, works for any date-format and even supports time-picking. It comes four CSS style skins, and it’s easy to create another one yourself.
You can easily customize datePicker according to your needs using several easy to use options. The date-formatting functions featured in the DatePicker support basic PHP date-format syntax. Tested on Firefox 3 (OSX, Win XP, Win Vista), Safari 3 (OSX, Win XP), Safari 4 beta (OSX), IE 7 (Win XP, Win Vista), IE 8 (Vista) and even IE6 (XP @ VirtualPC).
Developed by MonkeyPhysics; MooTools datePicker is available for download under Creative Commons Attribution-Share Alike 3.0 Unported license. You can find further information, demos and download on MonkeyPhysics Website.