There's more to this than what the OP stated!

In another post they wanted to count uniques for the *entire* column.

http://groups.google.com/group/micro...e0a4037?hl=en#

--
Biff
Microsoft Excel MVP


"Domenic" wrote in message
...
Assuming that the dates are true date values (day, month, and year), try
the following, which need to be confirmed with CONTROL+SHIFT+ENTER...

=SUM(IF(FREQUENCY(IF(YEAR(A2:A100)=2008,IF(B2:B100 <"",MATCH("~"&B2:B100,
B2:B100&""))),ROW(B2:B100)-ROW(B2)+1),1))

or

=SUM(IF(FREQUENCY(IF(A2:A100=DATE(2008,1,1),IF(A2 :A100<=DATE(2008,12,31)
,IF(B2:B100<"",MATCH("~"&B2:B100,B2:B100&"",0)))) ,ROW(B2:B100)-ROW(B2)+1
),1))

--
Domenic
http://www.xl-central.com

In article ,
"Brian" wrote:

Howdy All,

I'm use the CountU function to count unique values in a column and it
works
great!

Now what I want to do is count the unique values in Column B which occur
between a specific date range in Column A.

Column A contains dates from 2005 through 2009.

Column B contains Order Numbers for each date.

I want to count the unique values in column B for only 2008.

Any Ideas?

Thanks,
Brian