The Any+Time JavaScript Library includes an easy-to-use, easy-to-customize calendar widget (date and/or time picker) and a powerful Date/String parse/format utility. ATWidget is the AJAX-capable JavaScript GUI component. It is easy to add to a page and even easier to use! Unlike most date/time selection tools, nearly every field in an ATWidget control can be chosen with a single mouse click.

The ATWidget date/time control is attached to any input (text) field with a single line of JavaScript code. It can be placed as a popup or inline. The appearance of the ATWidget calendar tool can be customized by modifying or supplementing the included CSS stylesheet. All labels, as well as month, weekday and era names and abbreviations, are also easy to change.

Requirements: Prototype Framework
Demo: http://www.ama3.com/anytime/
License: Creative Commons License