How to use the Excel WEEKNUM Function

In this article, we will learn about how to use WEEKNUM function in Excel.

WEEKNUM function checks the date of the year and returns it week number in the cell.

=WEEKNUM(Serial number, [Return Ttype])

Return Type[optional]

Return Type Weekday Start Weekday End
1(default) Sunday Saturday
2 Monday Sunday
11 Monday Sunday
12 Tuesday Monday
13 Wednesday Tuesday
14 Thursday Wednesday
15 Friday Thursday
16 Saturday Friday
17 Sunday Saturday
21 Monday Sunday

Note: the WEEKNUM function will return a value even when the date is empty. Take care to trap this result if blank dates are possible.

Now Let’s understand how to use Weeknum function in Excel.

Here we have some dates to test the function.
Use the formula:


This one was obvious as 1st January comes in the first week of the year.

Now copy the formula in the remaining cells using Shortcut key Ctrl + D.
The function returned the week number as required.

Hope you understood how to use WEEKNUM function in Excel. Explore more articles on Excel Date & Time function here. Please feel free to state your query or feedback for the above article.

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