Calculate number of rows with current month & year in Google Sheets or Excel

Question

I have one row filled with dates in the format MM/dd/yyyy (with header row), such as:

DATES
5/12/2015
4/12/2012
5/7/2015
5/7/2014

I would like

Answer 1

In Google sheets you can use

=COUNT(FILTER(A:A,MONTH(A:A) = MONTH(TODAY()),YEAR(A:A)=YEAR(TODAY())))

Where A:A is the column with your dates