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MySQL user-defined function ID number to age (supports 15 / 18 digit ID card)

2022-07-05 14:10:00 【sr_ www】

FUNCTION `idcard2age`(`idcard` varchar(255)) RETURNS int(10)
BEGIN
	
	if(length(idcard)=18)then
		return ifnull(timestampdiff(YEAR,substring(idcard,7,8),now()),-1);
	elseif(length(idcard)=15)then
		return ifnull(timestampdiff(YEAR,concat('19',substring(idcard,7,6)),now()),-1);
	end if;

	RETURN -1;
END