Calculating the Week Number

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» Calculating the Week Number

CATEGORY: Excel Formula

VERSIONS: All Microsoft Excel Versions

To calculate a week number:

Use the WEEKNUM function.

The second argument in the WEEKNUM function, Return_type, determines on which day the week begins, for example, 1 for Sunday, 2 for Monday.

Note: This function is included in the Analysis ToolPak add-in. Users of Excel 97 and 2000: It is highly recommended that this Add-In be installed.

To install the Analysis ToolPak Add-In:
1. From the Tools menu, select Add-Ins.
2. Select the Analysis ToolPak checkbox, and then click OK.

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READER COMMENTS (view all comments)

What is "Return Type 2"?
Russ911 wrote on December 31, 1969 19:00 EST

In this WEEKNUM function, your example shows the results if Return Type 1 is selected.

I selected Return Type 2 and got the same numbers except for the date "2/1/2004" where I got a "5."

I.e.,
Return Type 1: 1, 6, 10, 14, 18, 23
Return Type 2: 1, 5, 10, 14, 18, 23

So what is shown with Return Type 2?

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