Excel

## How do you use ISOWEEKNUM in Excel?

ISOWEEKNUM is a function in Excel that calculates the ISO week number for a given date. The function takes two arguments: the date in question, and the year. The function returns a number from 1-53, representing the ISO week number for the given date within the given year.

## What is the syntax of ISOWEEKNUM in Excel?

The syntax of ISOWEEKNUM is as follows: ISOWEEKNUM(serial_number, [weekday], [first_day_of_week], [last_day_of_week])

The function returns the ISO week number for the given serial number. The function can optionally be given the weekday, first_day_of_week, and last_day_of_week arguments to specify which week to return. If these arguments are not given, the function will return the ISO week number for the current week.

## What is an example of how to use ISOWEEKNUM in Excel?

ISOWEEKNUM is a function in Excel that calculates the ISO week number for a given date. The ISO week number is a number that represents the week of the year according to the International Organization for Standardization. To use the ISOWEEKNUM function, you enter the date in the form of "yyyy-mm-dd", and the function will return the ISO week number for that date. For example, if you enter "2018-01-01" into a cell, the function will return "1".

## When should you not use ISOWEEKNUM in Excel?

ISOWEEKNUM should not be used in Excel when the date range includes February 29th. Excel will return the incorrect week number for dates that include February 29th. For example, if you have data that range from March 1st - March 7th, Excel will return the week number as 3 even though it is only the fourth week of the year.

## What are some similar formulae to ISOWEEKNUM in Excel?

ISOWEEKNUM is a formula that calculates the week number of a date. The following are some similar formulae to ISOWEEKNUM in Excel:

-WEEKNUM: This formula calculates the week number of a date based on the year, month, and day.

-DATE: This formula returns the serial number of a date.

-DAY: This formula returns the day of the month for a given date.

-MONTH: This formula returns the month of a date.

-YEAR: This formula returns the year of a date.

### Excel

Get started with Causal today.
Build models effortlessly, connect them directly to your data, and share them with interactive dashboards and beautiful visuals.