The Date module provides both a flexible date/time content type field and a Date API that other modules can use. This module also facilitates using pop-out calendar widgets for easier input of various dates/times.

The D5 and D6 versions of the Date field require the Content Construction Kit (CCK) module. The D7 version works with the core Field functionality.

The Drupal Handbook pages for the Date module is included with the Date/Calendar Documentation.