---
title: firstDayOfWeek
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/locale/firstdayofweek
---

# firstDayOfWeek

The first day of the week as represented by this locale.

## Declaration

```swift
var firstDayOfWeek: Locale.Weekday { get }
```

## Discussion

Discussion This value is the preferred first day of the week to show in a calendar view. It isn’t necessarily the same as the first day after the weekend; don’t try to determine a first-day-of-week value from weekend information. This property corresponds to the fw key of the Unicode BCP 47 extension. For locale instances created with the fw specifier (such as en-US@fw=mon), or with a custom Locale.Components, this property represents the custom day. Otherwise, it represents the locale’s default first day of the week.

## See Also

### Getting date and time components

- [Locale.Weekday](foundation/locale/weekday.md)
- [hourCycle](foundation/locale/hourcycle-swift.property.md)
- [Locale.HourCycle](foundation/locale/hourcycle-swift.enum.md)
- [timeZone](foundation/locale/timezone.md)