I'm storing a java.util.Date value and after reading it again it is two days behind. Looking into the database the value is correct, it must be the reading part which messes up the date.
I attached a test case which demonstrates the issue, getting the following outputs:
>>>>>>>>>>>>>>>>>>>>>>>>>>>> modifyDate before merge: Mon Jul 08 08:59:52 CEST 2013 time: 1373266792615
>>>>>>>>>>>>>>>>>>>>>>>>>>>> modifyDate after reading: 2013-07-06 08:59:52.615 time: 1373093992615