ISOWEEKNUM(date)

Returns the number of the ISO week of the year for a given date.

dateThe date.

Remarks

* Added in Excel 2013.
* This function returns a number between 1 and 54.
* The week number returned is according to the European ISO standard. All weeks start on a Monday and week number 1 is assigned to the first week that contains a Thursday.
* If "date" is not a valid date, then #VALUE is returned.
* If "date" is not a valid number, then #NUM is returned.
* You can use the NOW function to return the serial number of the current system date and time.
* You can use the TODAY function to return the serial number of the current system date.
* You can use the WEEKNUM function to return the week number in the year for a given date.
* For the Microsoft documentation refer to support.office.com

 A
1=TODAY() = Tuesday, October 15, 2019
2=NOW() = Tuesday, October 15, 2019, 08:29
3=ISOWEEKNUM(A1) = 42
4=ISOWEEKNUM(A1+7) = 43
5=ISOWEEKNUM(A2+14) = 44
6=WEEKNUM(A1,21) = 42

1 - What is the current system date. This cell has been formatted with the number format "dddd, mmmm dd, yyyy".
2 - What is the current system date and time. This cell has been formatted with the number format "dddd, mmmm dd, yyyy, hh:mm".

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