With support of over 25 languages out-of-the-box, Wicket let's you get started in your own language, or a second language with no effort.
Invented in 2004, Wicket is one of the few survivors of the Java serverside web framework wars of the mid 2000's.
Wicket is an open source, component oriented, serverside, Java web application framework.
2.5 is the current LTS (Long Term Support) version.
If you are running Joomla 1.5 you will need to upgrade.
As the bug link states you have to create date object by yourself.