Return the ISO Week Number from a Date in Excel - UDF
Return the ISO Week Number in Excel with this UDF. This is a simple to use UDF (user defined function) that returns the number of the week in the year that a specific date occurs.
Where to install the macro: Module
UDF to Return the ISO Week Number from a Date in Excel
Function ISOWEEKNUMBER(InDate As Date) As Long
Dim D As Date
D = DateSerial(Year(InDate - WeekDay(InDate - 1) + 4), 1, 3)
ISOWEEKNUMBER = Int((InDate - D + WeekDay(D) + 5) / 7)
End Function
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How to Install the Macro
- Select and copy the text from within the grey box above.
- Open the Microsoft Excel file in which you would like the Macro to function.
- Press "Alt + F11" - This will open the Visual Basic Editor - Works for all Excel Versions.
Or For other ways to get there, Click Here.
- On the new window that opens up, go to the left side where the vertical pane is located. Locate your Excel file; it will be called VBAProject (YOUR FILE'S NAME HERE) and click this.
- If the Macro goes in a Module, Click Here, otherwise continue to Step 8.
- If the Macro goes in the Workbook or ThisWorkbook, Click Here, otherwise continue to Step 8.
- If the Macro goes in the Worksheet Code, Click Here, otherwise continue to Step 8.
- Close the Microsoft Visual Basic Editor window and save the Excel file. When you close the Visual Basic Editor window, the regular Excel window will not close.
- You are now ready to run the macro.
Excel VBA Course - From Beginner to Expert
200+ Video Lessons
50+ Hours of Video
200+ Excel Guides
Become a master of VBA and Macros in Excel and learn how to automate all of your tasks in Excel with this online course. (No VBA experience required.)