Simon Pai has written a blog introducing one of ZK 6's new features, Datebox and Timebox input shortcut, providing a way to speed up date and time input for regular users of a web application.
To go to the blog post: http://blog.zkoss.org/index.php/2011/11/06/zk-6-0-new-feature-highlight-part-3-dateboxtimebox-input-shortcut/