This is a part of an article serie where we create a ASP.NET 2.0 server control providing date (and time) selection popup . Please start from the beginning.
Finally - just download and test it out. The solution contains one testproject - and the control is inside its own dll project.
Weak points as I know of right now:
1. not all Javascript configuration properties are supported
2. Date translation is not complete
3. Controldesigner is very basic
However - hopefully this tutorial might have given you the insight on how to move on and get the perfect datetime picker control!