... calculates Memorial Day for the year in cell A1:=DATE(A1,6 ,1) +IF(2<WEEKDAY(DATE(A1,6 ,1) ),7-WEEKDAY(DATE(A1,6 ,1) )+2,2-WEEKDAY(DATE(A1,6 ,1) ))+( (1- 1)*7)-7Notice that this formula actually calculates ... calculates Presidents’ Day for the yearin cell A1:=DATE(A1,2 ,1) +IF(2<WEEKDAY(DATE(A1,2 ,1) ),7-WEEKDAY(DATE(A1,2 ,1) )+2,2-WEEKDAY(DATE(A1,2 ,1) ))+((3 -1) *7)Memorial DayThe last Monday in May is ... Day forthe year in cell A1:=DATE(A1 ,1, 1)+IF(2<WEEKDAY(DATE(A1 ,1, 1)),7-WEEKDAY(DATE(A1 ,1, 1))+2,2-WEEKDAY(DATE(A1 ,1, 1)))+((3 -1) *7)Presidents’ DayPresidents’ Day occurs on the third Monday...