# ISOWEEKNUM

## Content

This function calculates the number ISO week number of the year for the specified date.

## Syntax

`ISOWEEKNUM( date )`

## Arguments

Specify the *date* argument as a number (as in 37806), a string, or a reference to a cell containing the information.

## Data Types

Accepts numeric or string data for both arguments. Returns numeric data.

## Examples

`ISOWEEKNUM("5/9/2015")` give the result 19.