That was surprise for me that wicket doesn't support convertion of java.util.Date, java.sql.Date, java.sql.Time, java.sql.Timestamp taking into account client timezone.
I know about existing DateConverter/StyleDateConverter and etc. But it's not so easy to extend and reuse that for java.sql.* types.
Please find in the attachment our implementation of date convertor which is taking into account client timezone and don't use org.joda.time. Hope that it can be included (maybe after some refactoring) into main branch. Please let me know your vision of this approach and if you are OK: let me go ahead and prepare patch.