I think that this is a SUMIF question: I have a spreadsheet with dates going
out to 2025, as production numbers come in, I want to sum the 12 most
current, so i can do a sumif formula with date range, large(range, 15),
production range being the criteria, but I need the formula to also take
into account when there is no date inputed and to only calculate the 12
latest inputted values. Thanx in advance!