How can I count dates if few duplicates in a column

[Tariq Aziz]

I entered few dates in Column C3 to C20, few of them are duplicates.
How can I count total number of dates (excluding duplicates), duplicates
should be count 1.

 

[Jacob Skaria]

Try the below

=SUMPRODUCT(--(C3:C20<>""),1/COUNTIF(C3:C20,C3:C20&""))

 

[Mike H]

Hi,

Try this

=SUMPRODUCT((C3:C20<>"")/COUNTIF(C3:C20,C3:C20&""))
--
Mike

When competing hypotheses are otherwise equal, adopt the hypothesis that
introduces the fewest assumptions while still sufficiently answering the
question.

 

[T. Valko]

As long as they are true Excel dates...

=SUM(--(FREQUENCY(C3:C20,C3:C20)>0))