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# Excel/Counting unique dates between 2 dates

Question
Hi Tom,
I am trying to determine the unique days that fall between two dates in a list of total dates.

I have a list of dates represented by named range 'DateCount'.
I have a starting date for the formula in C39.
I have an ending date for the formula in E39.

I am trying to determine the unique days in this list of dates, that also fall between the two dates in C39 and E39.

I tried using this array formula but something wasn't working out.
Do you see any errors in the formula or do you perhaps have a better way of solving the problem?

=SUM(1*(FREQUENCY(MATCH(TRUNC(IF((DateCount>=\$C\$39)*(DateCount<=\$E\$39),DateCount)),TRUNC(IF((DateCount>=\$C\$39)*(DateCount<=\$E\$39),DateCount)),0),MATCH(TRUNC(IF((DateCount>=\$C\$39)*(DateCount<=\$E\$39),DateCount)),TRUNC(IF((DateCount>=\$C\$39)*(DateCount<=\$E\$39),DateCount)),0))>0))-(COUNTIF(DateCount,"=")>0)-1*1

Thanks for the help,
Jesse

Jesse,

same suggestion I gave to your previous question.  I have modified your formula to include that concept and it worked fine for me.

=SUM(1*(FREQUENCY(MATCH(TRUNC(IF((DateCount>=\$C\$39)*(DateCount<\$E\$39+1),DateCount)),TRUNC(IF((DateCount>=\$C\$39)*(DateCount<\$E\$39+1),DateCount)),0),MATCH(TRUNC(IF((DateCount>=\$C\$39)*(DateCount<\$E\$39+1),DateCount)),TRUNC(IF((DateCount>=\$C\$39)*(DateCount<\$E\$39+1),DateCount)),0))>0))-(COUNTIF(DateCount,"=")>0)-1*1

--
Regards,
Tom Ogilvy

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#### Tom Ogilvy

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