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Count Months in a Pivot List (Formula)
=COUNTIF(A:A,"Jan")+COUNTIF(A:A,"Feb")+COUNTIF(A:A,"Mar")+COUNTIF(A:A,"Apr")+COUNTIF(A:A,"May")+COUNTIF(A:A,"Jun")+COUNTIF(A:A,"Jul")+COUNTIF(A:A,"Aug")+COUNTIF(A:A,"FSep")+COUNTIF(A:A,"Oct")+COUNTIF(A:A,"Nov")+COUNTIF(A:A,"Dec")
This formula counts all the occurrences of a month in the list when using multiple years and you need to know how many months it covers.