Count of unique dates in a column

[Danger_SF]

Good afternoon!

See attached. If you manually count the unique DATES in column A associated with the name "John Doe" in column B, you count 17 unique dates.

I'm looking for a formula that does that in a worksheet with 28,000 rows and 400 different names. Keep in mind, I don't want the formula to pay any attention to the time that is built in to the date format. Just the date itself.

Can this be done?

[#2 · Accepted solution]

@Danger_SF 

=SUM(N(IF(C1:C21=F1,MATCH(IF(C1:C21=F1,D1:D21),IF(C1:C21=F1,D1:D21),)=ROW(1:21))))

Is this what you want to do? Enter formula as arrayformula with ctrl+shift+enter if you don't work with Office365 or 2021.

[#3]

Nice job! That worked. Thank you!