# Return the Week Number of an Excel Date

## Excel: Returning Week Number of a Date/Obtain Week Number of a Date

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Excel: Returning Week Number

To return the week number of a date we can use the WEEKNUM formula. It will return a number that indicates where the week falls numerically within a year. If this function is not available, and returns the #NAME? error, install and load the Analysis ToolPak add-in. That is, Tools>Add-ins.

The formula syntax for the WEEKNUM formula is;

WEEKNUM(serial_num,return_type)

Serial_num is any valid date. See how Excel stores dates & times .
Return_type is a number that determines on which day the week begins. The default for Return_type is 1, or it can be omitted and the week begins on a Sunday. If Return_type is 2, the week begins on a Monday.

An example of WEEKNUM formula is as shown below

=WEEKNUM(A1)
OR
=WEEKNUM(A1,2)

Where A1 houses a valid Excel date.

To hard code the date we could use;

=WEEKNUM("3 Apr 2005")
OR
=WEEKNUM("3 Apr 2005",2)

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