» Calculating the Week Number
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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