You can find more information about ISO dates and week numbers on this page: The Excel WEEKNUM Function For more information on the DatePart method bug, see this KB article: BUG: Format or DatePart Functions Can Return Wrong Week Number for Last Monday in Year. Use the VBA IsoWeekNumber function above to avoid problems. However, because there is a bug with the VBA DatePart function with respect to ISO week numbers, it is not a good option to use it. In VBA you could also use: DatePart( "ww", date,vbMonday,vbFirstFourDays) IsoWeekNumber = Int((d1 - d2 + WeekDay(d2) + 5) / 7) After adding this UDF to your workbook, you can use it like a built-in function =IsoWeekNumber(B4) Public Function IsoWeekNumber(d1 As Date) As Integer ' Attributed to Daniel Maher Dim d2 As Longĭ2 = DateSerial(Year(d1 - WeekDay(d1 - 1) + 4), 1, 3) =INT((B4-DATE(YEAR(B4-WEEKDAY(B4-1)+4),1,3)+WEEKDAY(DATE(YEAR(B4-WEEKDAY(B4-1)+4),1,3))+5)/7)Īlternatively, you can open the Visual Basic editor, click Module on the Insert menu, and then copy this user-defined function (UDF) into the module. Copy the following formula and paste it in a worksheet cell to return an ISO week number: There is no built-in worksheet function for ISO week numbers in Excel. The following sections assume that you have a date in cell B4 for testing the week number formulas. Note: Excel does not have a standard worksheet function for the ISO week number and simple week numbering system. Week one begins on January 1st, week two begins on January 8th, and week 53 has only one or two days (for leap years). Week one begins on January 1st week two begins on the following Monday. Week one begins on January 1st week two begins on the following Sunday.ģ) Excel WEEKNUM function with an optional second argument of 2. Week one starts on Monday of the first week of the calendar year with a Thursday.Ģ) Excel WEEKNUM function with an optional second argument of 1 (default). Excel can work with any of these systems:ġ) ISO Week number: The International Organization for Standardization (ISO) ISO8601:2000 Standard.Īll weeks begin on a Monday. Each system has subtle differences that you should be aware of. There are four primary week numbering systems in use worldwide. You can find more useful tips from Ron and links to Excel add-ins at his website: Today’s author is, Ron de Bruin, an Excel MVP.
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