How to validate a Date in DB2

This function verify if a date is valid in DB2 according to a custom date format.

-- this function return 1 if the varchar date and 0 if the date is not valid 
-- the format of the date is passed in the second parameter (ex. mm/dd/yyyy) 
 
CREATE OR REPLACE FUNCTION DB.FUNC_IS_VALID_DATE(dateToValidate VARCHAR(20), dateFormat VARCHAR(20)) RETURNS INTEGER 
 
  BEGIN 
     DECLARE functionResult INT; 
     DECLARE resultingDate DATE; 
     DECLARE SQLCODE INTEGER; 
 
     DECLARE CONTINUE HANDLER FOR SQLEXCEPTION BEGIN 
         RETURN 0; -- the data is not valid 
     END; -- END DECLARE 
 
     SELECT to_date(dateToValidate, dateFormat) INTO resultingDate FROM SYSIBM.SYSDUMMY1; 
     RETURN 1; -- the data is valid 
  END;