DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` FUNCTION `util`.`firstDayOfYear`(vDate DATE)
	RETURNS date
	DETERMINISTIC
	NO SQL
BEGIN
/**
 * Returns the date formatted to the first day of year.
 *
 * @param vDate The date to format
 * @return The formatted date
 */
	RETURN DATE_FORMAT(vDate, '%Y-01-01');
END$$
DELIMITER ;
