---
title: "CFCalendarSetFirstWeekday(_:_:)"
framework: corefoundation
role: symbol
role_heading: Function
path: "corefoundation/cfcalendarsetfirstweekday(_:_:)"
---

# CFCalendarSetFirstWeekday(_:_:)

Sets the first weekday for a calendar.

## Declaration

```swift
func CFCalendarSetFirstWeekday(_ calendar: CFCalendar!, _ wkdy: CFIndex)
```

## Parameters

- `calendar`: The calendar to modify.
- `wkdy`: The index to set for the first weekday of calendar.

## See Also

### Getting and Setting Day Information

- [CFCalendarGetFirstWeekday(_:)](corefoundation/cfcalendargetfirstweekday(_:).md)
- [CFCalendarGetMinimumDaysInFirstWeek(_:)](corefoundation/cfcalendargetminimumdaysinfirstweek(_:).md)
- [CFCalendarSetMinimumDaysInFirstWeek(_:_:)](corefoundation/cfcalendarsetminimumdaysinfirstweek(_:_:).md)