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In VBA, you can convert a date to a week number by using the WeekNum function. This function takes the date as an argument and returns the week number of the year as an integer. This is useful if you want to categorize data by week.
You can use the following basic syntax in VBA to convert a date to a week number:
Sub FindWeekNumber()
Dim i As Integer
For i = 2 To 9
Range("B" & i) = WorksheetFunction.WeekNum(Range("A" & i))
Next i
End Sub
This particular example will find the week number for each date in the range A2:A9 and display the results in the range B2:B9.
Note that the VBA WeekNum method assumes that weeks start on Sundays.
To specify a different day as the start of the week, you can add a second argument to the WeekNum method:
Sub FindWeekNumber()
Dim i As Integer
For i = 2 To 9
Range("B" & i) = WorksheetFunction.WeekNum(Range("A" & i), vbMonday)
Next i
End Sub
The following example shows how to use the WeekNum method to convert dates to week numbers in practice.
Example: Convert Date to Week Number in VBA
Suppose we have the following column of dates in Excel:
Suppose we would like to convert each date to a week number and display the week number in column B.
We can create the following macro to do so:
Sub FindWeekNumber()
Dim i As Integer
For i = 2 To 9
Range("B" & i) = WorksheetFunction.WeekNum(Range("A" & i))
Next i
End Sub
When we run this macro, we receive the following output:
Column B displays the week number for each date in column A, assuming that the weeks start on Sundays.
If you’d like to specify a different day as the start of the week, such as Monday, you can use the following syntax:
Sub FindWeekNumber()
Dim i As Integer
For i = 2 To 9
Range("B" & i) = WorksheetFunction.WeekNum(Range("A" & i), vbMonday)
Next i
End Sub
When we run this macro, we receive the following output:
Column B now displays the week number for each date in column B, assuming that the weeks start on Mondays.
Note: You can find the complete documentation for the VBA WeekNum method .