DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` FUNCTION `util`.`firstDayOfMonth`(vDate DATE)
	RETURNS date
	DETERMINISTIC
	NO SQL
BEGIN
/**
 * Returns the date formatted to the first day of month.
 *
 * @param vDate The date to format
 * @return The formatted date
 */
	RETURN TIMESTAMPADD(DAY, - DAY(vDate) + 1, vDate) ;
END$$
DELIMITER ;
