You will need to put the month(s) in a separate "helper" column and sort on
this column.

If dates are in column A then in your "helper" column put:

=MONTH(A2)

and copy down.

Sort on this column.

"David" wrote:

Hi

I have a lot of birthday dates that I want to group into months. But, I am
having difficulty to sort them by months. It keeps sorting by years!

The birthday format is dd/mm/yyyy.

Can anyone help?