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

You can use COUNTIFS like this

=COUNTIFS(A:A,">="&EOMONTH(TODAY(),-1)+1,A:A,"<"&EOMONTH(TODAY(),0)+1)

That works equally well in Excel or google sheets, for the whole column and will ignore the header row