Excel ISOWEEKNUM Function

Excel ISOWEEKNUM Function

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Get ISO week number for a given date

Return value 

A number between 1 and 54.




  • date – A valid Excel date in serial number format.

Usage notes 

The ISOWEEKNUM function returns a week number based on ISO standards. Under this standard, weeks begin on Monday and the week number 1 is assigned to the first week in a year that contains a Thursday.

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