---
title: "GetFirstDayOfIso8601WeekOfYear"
slug: "getfirstdayofiso8601weekofyear"
updated: 2024-04-16T11:16:20Z
published: 2024-04-16T11:16:20Z
canonical: "help.mail-and-deploy.com/getfirstdayofiso8601weekofyear"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.mail-and-deploy.com/llms.txt
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# GetFirstDayOfIso8601WeekOfYear

### General

This function returns a Date-Time that represents the first day of a given week of year according to ISO 8601.

### Syntax

You can call the GetFirstDayOfIso8601WeekOfYear function using the following syntax:

          GetFirstDayOfIso8601WeekOfYear Function Syntax

          

GetFirstDayOfIso8601WeekOfYear(<year>, <weekofyear>)

The parameters of the function are:

| Name | Description |
| --- | --- |
| year | The year to which the week of year belongs. |
| weekofyear | The week of year for which to return the first day. |
| Examples |  |
| The following expression returns a Date-Time that contains the first day of the week of year 37 of 2021: |  |

          GetFirstDayOfIso8601WeekOfYear Function Example

          

GetFirstDayOfIso8601WeekOfYear(2021, 37)