---
title: "GetIso8601WeekOfYear"
slug: "getiso8601weekofyear"
updated: 2024-05-04T19:41:03Z
published: 2024-05-04T19:41:03Z
canonical: "help.mail-and-deploy.com/getiso8601weekofyear"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.mail-and-deploy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# GetIso8601WeekOfYear

### General

This function returns a [Number](/release34/docs/number) that contains the week of year according to ISO 8601 for a given [Date-Time](/release34/docs/date-time).

### Syntax

You can call the *GetIso8601WeekOfYear* function using the following syntax:

          GetIso8601WeekOfYear Function Syntax

          

GetIso8601WeekOfYear(<datetime>)

The parameters of the function are:

| Name | Description |
| --- | --- |
| datetime | The [Date-Time](/release34/docs/date-time) for which to return the week of year. |

### Examples

The following expression returns the week of year for the current date-time:

          GetIso8601WeekOfYear Function Example

          

GetIso8601WeekOfYear(DateTime.Today)