WEEKNUM

Returns the number representing the week of the year for a given date.

Syntax

WEEKNUM(date; [mode])

date: The date for which you want to find the week number. E.g. "2/3/2020"

mode: Determines the numbering system to use. Defaults to 1 if omitted.

mode	Week begins on	System
1	Sunday	1
2	Monday	1
11	Monday	1
12	Tuesday	1
13	Wednesday	1
14	Thursday	1
15	Friday	1
16	Saturday	1
17	Sunday	1
21	Monday	2

Examples

Formula	Result
=WEEKNUM("2/3/2020";2)	6
=WEEKNUM("3/5/2020";21)	10
=WEEKNUM("12/31/2020")	53

Get a hands-on experience of the function in the embedded range below.

Possible Errors

Errors	Meaning
#N/A!	The function could not find the value it was asked to look for. Commonly occurs in VLOOKUP and similar functions.
#NAME!	The function name is incorrect or invalid. The given defined name (if any) is invalid. There is a typo in the defined name used in the function. Double quotes are missing for text values in the function. Colon missing in a cell range reference.
#VALUE!	The given argument's data type is incorrect or invalid. For example, the function =DATE(A1:A3) will return a #VALUE error when a text value is present in the range.
#REF!	The given cell reference is incorrect or invalid. This error may occur when a cell/range has been deleted, moved, or pasted over.

Similar Functions

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