Hi,

I have =DATE(2006,1,1) in cell B5 (with custom format mmm yyyy) and entered =DATE(YEAR(B5),MONTH(B5),1) in cell A7 (with custom format d). Then I entered =IF(DATE(YEAR(B5),MONTH(B5),DAY(A7)+1)>DATE(YEAR(B5),MONTH(B5)+1,0),"",DATE(YEAR(B5),MONTH(B5),DAY(A7)+1)) in cell A8 (with custom format d),which I want to copy down the next twenty-nine cells (also with custom format d), but it is giving the error #NUM! What have I done wrong?

Thanks,
Gos-C