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Sum the number of dates that fall on a specific week

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Last Modified: 2018-03-21
Dear experts,

1. There is a list of dates in A1 to A10
2. In A11 I need a formula which counts how many of those dates fall in week 5.

Br,
Juan
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Ryan ChongSoftware Tead Lead / Business Analyst / System Analyst / Data Engineer / Applications Consultant
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Commented:
for cell B1 you can use this formula instead:

=WEEKNUM(A1,2)-WEEKNUM(DATE(YEAR(A1),MONTH(A1),1),2)+1

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Commented:
The weeknumber function in Excel start week 1 on the first day of the year.
This means that for 2017, week 1 is only 1 day.

If you want to use ISO calender weeks, use this in A11.
=SUMPRODUCT(((INT((A1:A10-DATE(YEAR(A1:A10-WEEKDAY(A1:A10-1)+4),1,3)+WEEKDAY(DATE(YEAR(A1:A10-WEEKDAY(A1:A10-1)+4),1,3))+5)/7))=5)*1)

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