

Let’s see how this formula can be used along with another Date & Time function. The formula would take that as week 1 of the year as shown above. Now let’s assume the date is January 1, 2015, which is a Thursday. As shown below, and dates between Januto Januwill be the first week and then January 9 will come under the second week. So, the first week of the year will start from Januand end on January 8, 2017. As January 1 was a Sunday in 2017, when you use this function, it will show 52 as the result: Example 2įor the ISOWEEKNUM function, the week starts on Monday. If we wish to find out which week of the year it is, we can use the ISOWEEKNUM function in this manner:Ĭolumn B displays the date and Column C the result of the function. Let’s assume the date today is April 1, 2017. To understand the uses of this function, let’s consider a few examples.
#Excel formula week number how to#
How to use ISOWEEKNUM to get week number in Excel? This function will return a number between 1 to 52, specifying in which week the date falls. So Januwould be the serial number 1 and Januwould be 39814, as it is 39814 days after January 1, 1900. It represents the days from January 1, 1900. Excel stores dates in a serial date format.

The function was introduced in MS Excel 2013. The ISOWEEKNUM Function in Excel is a Date & Time Function used for finding out the ISO week number of the year for the given date value (e.g., week number 37 of 52 weeks in a year). Updated JanuWhat is the ISOWEEKNUM Function?
