Hey There,
Currently I am using this formula:
=SUMPRODUCT(IF(MOD(ROW(C12:C)-ROW(C12),12)=0,IF(ISNUMBER(C12:C),IF(C12:C-DAY(C12:C)+1=DATE(2017,8,1),C4:C))))
Which works great; however, when I try to get all the data from the whole year and switch to...