# FirstWeekDay Property

## Overloads

| [FirstWeekDay](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.LocaleInfo.FirstWeekDay.htm#Qlik_Engine_LocaleInfo_FirstWeekDay) |  | First day of the week, starting from 0.<br><br>According to ISO 8601, `Monday` is the first day of the week.<br><br>\* 0 = Monday<br><br>\* 1 = Tuesday<br><br>\* ...<br><br>\* 6 = Sunday<br><br>If this property has not been set in a script, the returned value comes from the Windows operating system.<br><br>JSON property name: qFirstWeekDay |
| --- | --- | --- |

[](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.LocaleInfo.FirstWeekDay.htm) [](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.LocaleInfo.FirstWeekDay.htm)

## FirstWeekDay

First day of the week, starting from 0.

According to ISO 8601, `Monday` is the first day of the week.

* 0 = Monday
* 1 = Tuesday
* ...
* 6 = Sunday

If this property has not been set in a script, the returned value comes from the Windows operating system.

JSON property name: qFirstWeekDay

### Declaration

```

          public int FirstWeekDay { get; set; }
    
  
```

### Property Value

| Type | Description |
| --- | --- |
| System.Int32 |  |

### Implements

[ILocaleInfo.FirstWeekDay](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.ILocaleInfo.FirstWeekDay.htm#Qlik_Engine_ILocaleInfo_FirstWeekDay)