Excel WEEKNUM() Function
The WEEKNUM() function in excel returns the week number from 1 to 54 of a specific date in a year. The WEEKNUM function starts counting with the week that contains January 1 and, by default, weeks begin on Sunday.
Syntax
WEEKNUM (serial_num, [return_type])
Parameter
serial_num (required)- This parameter represents the date from which you want to extract the year part.
return_type(optional)- This parameter represents the day from which the week begins. The default value is 1.
Category
Date & Time
Return
This function returns the week number from 1 to 54 of a specific date in a year.
Example 1
Objective: Get the week number for a date given in Col A
| Col A | Result | Formula |
| 11/15/2019 | 46 | =WEEKNUM(A20) |
| 1/23/1918 | 4 | =WEEKNUM(A21) |
| 2/3/2012 | 5 | =WEEKNUM(A22) |
| 7/5/2016 | 28 | =WEEKNUM(A23) |
Example 2
Objective: Get the week number for a date given in a cell Col A. Week starts from Monday
| Col A | Result | Formula |
| 11/15/2019 | 46 | =WEEKNUM(A20,2) |
| 1/23/1918 | 4 | =WEEKNUM(A21,2) |
| 2/3/2012 | 5 | =WEEKNUM(A22,2) |
| 7/5/2016 | 28 | =WEEKNUM(A23,2) |
Example 3
Objective: Calculate the number of weeks pending in the current year, week starting from Thursday.
| Col A | Result | Formula |
| 15-Nov-19 | 6 | =WEEKNUM(DATE(2018,12,31),14)-WEEKNUM(TODAY(),14) |