Table of Contents
This guide explains how to use ISOWEEKNUM Function in Excel, including its syntax, required arguments, practical examples, and common errors.
Description: The function returns the ordinal number in the year of the week that contains the given date.
Syntax : ISOWEEKNUM (date)
Where: date is the date to determine the week number in the year that contains that day, a required parameter.
Attention:
- Excel stores dates in a consecutive number format to facilitate the calculation process.
- The date argument is not a valid number -> the function returns the #NUM! Error value
- The date argument is not a valid date -> the function returns the #VALUE! Error value
For example:
Find the week number for the year corresponding to the date in the table below:
- In the cell to calculate enter the formula: = ISOWEEKNUM (E7).
- Press Enter -> 12/25/16 located at week 51 of the year:
- Similarly copying the formula for the remaining values results:
- Where the date value is invalid -> the function returns the error value #VALUE!
Above are instructions and some specific examples when using the ISOWEEKNUM function .
Good luck!
FAQ
What does the ISOWEEKNUM function do in Excel?
The ISOWEEKNUM function performs the calculation described in this guide. Use the correct arguments and compatible data types for reliable results.
How do I enter the ISOWEEKNUM function correctly?
Start with an equals sign, enter ISOWEEKNUM, add the required arguments inside parentheses, and confirm that cell references and separators are correct.
Why does the ISOWEEKNUM function return an error?
Common causes include missing arguments, invalid data types, incorrect cell references, unsupported values, or regional separator settings.
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