I have a sheet of trainings in excel that are organized by date and I am trying to do a monthly statistics report. So, I want to count, through an excel formula, the number of
With the "header of the stat column" as A1 and the training dates in A2:A999 you could use,
=countifs(a2:index(a:a, match(1e99, a:a)), ">="&date(2015, a1, 1), a2:index(a:a, match(1e99, a:a)), "<"&edate(date(2015, a1, 1), 1))