google-sheets - Spreadsheet match row number and use in dynamic function

Question

I'm using a Google spreadsheet (although I can't get to work in Excel either) that has a list of dates in Column A including dates (sorted in order) in the past and future. I want to use a COUNTA function for all the rows up to today's date.

I can return the row position of today's date using;

=MATCH(today(),A:A,0)

Lets say this returns the number 15 as in Row 15.

However what I then need to do is reference this dynamically in my COUNTA function, e.g.:

=COUNTA(C3:"D" &(MATCH(today(),A:A,0))) 

to replicate =COUNTA(C3:D15).

This doesn't seem to work with the above syntax. I wondered if I need to use an INDIRECT function but I had quite a few tries and wasn't able to get the syntax right on that either.