Fix some bugs

Need help to fix some bugs in existing PHP project ( Codeignitor framework ) 1. check duplicate value in form before insert into database ( need to add check data if value exists, before inser - to existing function ) 2. implement codeignitor date helper and change date print format to "d.m.Y" ( at the moment I use <td><?php echo date("d.m.Y", strtotime($i->create_date)); ?></td> but as in SQL table there is DEFAULT = NULL then in view "01.01.1970" [login to view URL] 3. save todo list checked status into sql table and print status in view ( if user press checked, then update status completed=1 in task table ) +------------+------------+------+-----+-------------------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------+------------+------+-----+-------------------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | user_id | int(11) | NO | | NULL | | | task | tinytext | NO | | NULL | | | completed | tinyint(4) | YES | | NULL | | | start_date | timestamp | NO | | CURRENT_TIMESTAMP | | | end_date | timestamp | YES | | NULL | | +------------+------------+------+-----+-------------------+----------------+ For senior developer it's one hour job. Thanks.