ปี =DATEDIF(DATE(YEAR(D19)-543,MONTH(D19),DAY(D19)),DATE(YEAR(D20)-543,MONTH(D20),DAY(D20)),"y")
เดือน =DATEDIF(DATE(YEAR(D19)-543,MONTH(D19),DAY(D19)),DATE(YEAR(D20)-543,MONTH(D20),DAY(D20)),"ym")
ปี =DATEDIF(DATE(YEAR(D19)-543,MONTH(D19),DAY(D19)),DATE(YEAR(D20)-543,MONTH(D20),DAY(D20)),"md")