Date & Time Picker :
 
The calendar can also be used as a flat widget on the page.

You can embed this in your own apps or as a pop up window that returns the date value to the opening page.
Click here for an example

A number of drop-down calendars can be placed on the page in the same form making it perfect for Reservation Systems etc.

You can prepopulate the date widget with a date by passing startDate="2004-03-22" and also using ColdFusion DateFormat, organise the date sting as you wish.