Hello Matt,
Since the ISO 8601 week and the Gregorian calendar week are not identical, you will need to use a conversion function to return the correct ISO week.
From Chip Pearson's site http://www.cpearson.com/excel/WeekNumbers.aspx
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Public Function IsoWeekNumber(InDate As Date) As Integer Dim D As Long D = DateSerial(Year(InDate - Weekday(InDate - 1) + 4), 1, 3) IsoWeekNumber = Int((InDate - D + Weekday(D) + 5) / 7) End Function
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