Is it possible to utilise the formula below , however, by just highlighting
the whole column as the range, as opposed to physically highlighting from
A1:A1000. If i use this folrmula and highlight column A as opposed to
A1:A1000 i get a NUM error

=SUMPRODUCT(--(MONTH(A1:A100)=2),--(YEAR(A1:A100)=2009))