The Excel ISOWEEKNUM function is a DATE & TIME function. This function takes the date value of any valid year as input and returns the week number of any particular year as numerical format. In this article, we will learn how to use the ISOWEEKNUM function in Excel. DATE value in excel is stored as number.
Syntax of ISOWEEKNUM Function:
date : valid date
All of these might be confusing to understand. So, let's test this formula via running it on the example shown below. So, here I have a table of some data. Excel understands date value as numerical value. We will get the week number for each of the given date values.
Use the formula:
It will return 8. Here the argument to the ISOWEEKNUM function is given using cell reference. The returned value by ISOWEEKNUM function is 8 as excel calculates the date 22-02-2012 comes in the 8th week of the 2012 year. Now You can copy the formula from one to the remaining cells using the Ctrl + D shortcut key or using the drag down option in excel.
As you can see from the above snapshot that ISOWEEKNUM function takes date value as input and returns the week number of the given input date as numeric value. The function returns #VALUE! Error if the date value is invalid.
Here are some observational notes shown below.
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