Summary
The Excel WEEKNUM function takes a date and returns a week number (1-54) that corresponds to the week of year. The WEEKNUM function starts counting with the week that contains January 1. By default, weeks begin on Sunday.
Purpose
Get the week number for a given date
Return value
A number between 1 and 54.
Syntax
=WEEKNUM (serial_num, [return_type])
Arguments
- serial_num – A valid Excel date in serial number format.
- return_type – [optional] The day the week begins. Default is 1.
Usage notes
The WEEKNUM function starts counting with the week that contains January 1. Thereturn_type argument is optional and defaults to 1. Return_type can either be 1 or 2:
1 – Week begins on Sunday
2 – Week begins on Monday
