$sth = $dbh->	prepare("UPDATE $calendar_table
				SET
				 year = ?
				 month = ?
				 day = ?
				 time_start = ?
				 time_end = ?
				 title = ?
				 location = ?
				 description = ?
				 category = ?
				 posted_by = ?
				 post_date = ?
				 b_time = ?
				 e_time = ?

				WHERE year = ?
				AND month = ?
				AND day = ?
				AND time_start = ?
				AND time_end = ?
				AND title = ?
				");