ISOWEEKNUM is a new function introduced in Excel 2013.

This function returns the number of the ISO week number of the year for the date in reference.



Where “date” can be a date or a reference to a cell containing date.

Example:- We will get 49 as a result if we use ISOWEEKNUM function for a date 07-Dec-2012. Below is the formula for the same.


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