whats error in this store procedure

DELIMITER $$

DROP PROCEDURE IF EXISTS `datepaty`.`datepart` $$
CREATE PROCEDURE `datepaty`.`datepart` ()
BEGIN
 declare week1 int
 SELECT week('98-04-01');
END $$

DELIMITER ;

Script line: 4  You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT week('98-04-01');
END' at line 4