Zend_Db_Expr

new Zend_Db_Expr("NULL")

new Zend_Db_Expr("now()")

Use Zend_Db_Expr("now()") instead of php date("Y.m.d H:i:s")function.


Example:
        $data = array(
                    "created"=>new Zend_Db_Expr("now()"),
                    "enabled"=>0,
                    "deleted"=>0
                );
       
        $db->insert("table_name", $data);