This is a patch that removes bug with exporting to Excel dates before 1900-03-01.
The bug is explained here - http://sourceforge.net/tracker/?func=detail&aid=2879711&group_id=28383&atid=393414
I already posted there a solution few weeks ago, but i haven't received any replies, so im reposting it here.
The patch modifies file TableExportCvsCommand.java. Its explained also in my reply to the bug.