I have a worksheet with two columns, each column has a date/time value. I need to know how many of the cells in column A match the cells in column B on a row-by-row basis. Now, I could do it row by row with IF, but is there a way to look at the whole range and just count in one instance?

To clarify, the same values must only take place in the same row (e.g., A3=B3), and I'd like for the formula to return how many of those cells equal each other. Thanks!