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 B, 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 here.

**Additional Resources**

The following tutorials explain how to perform other common tasks in VBA:

How to Compare Dates in VBA

How to Convert String to Date in VBA

How to Calculate Days Between Two Dates in VBA