update CONTENT SET PUBLICATION_END=NULL WHERE PUBLICATION_END='0000-00-00 00:00:00';
update CONTENT SET PUBLICATION_BEGIN=NULL WHERE PUBLICATION_BEGIN='0000-00-00 00:00:00';
update CONTENT SET REFERED_SUBJECT_END=NULL WHERE REFERED_SUBJECT_END='0000-00-00 00:00:00';
update CONTENT SET REFERED_SUBJECT_BEGIN=NULL WHERE REFERED_SUBJECT_BEGIN='0000-00-00 00:00:00';
