Swift - Weekday by current location by currentCalendar()

Question

Today is Wednesday and I have this code

let calendar:NSCalendar = NSCalendar.currentCalendar()
let dateComps:NSDateComponents = calendar.components(.Calendar         


        

Answer 1

For the Gregorian calendar, the weekday property of NSDateComponents is always 1 for Sunday, 2 for Monday etc.

NSCalendar.currentCalendar().firstWeekday

gives the (index of the) first weekday in the current locale, that could be 1 in USA and 2 in Bulgaria. Therefore

var dayOfWeek = dateComps.weekday + 1 - calendar.firstWeekday
if dayOfWeek <= 0 {
    dayOfWeek += 7
}

is the day of the week according to your locale. As a one-liner:

let dayOfWeek = (dateComps.weekday + 7 - calendar.firstWeekday) % 7 + 1

---

Update for Swift 3:

let calendar = Calendar.current
var dayOfWeek = calendar.component(.weekday, from: Date()) + 1 - calendar.firstWeekday
if dayOfWeek <= 0 {
    dayOfWeek += 7
}

Answer 2

If you want to know which are the weekend days you can use this extension:

extension Calendar {

    /// Return the weekSymbol index for the first week end day
    var firstWeekendDay: Int {
        let firstWeekDay = self.firstWeekday
        return (firstWeekDay - 2) >= 0 ? firstWeekDay - 2 : firstWeekDay - 2 + 7
    }

    /// Return the weekSymbol index for the second week end day
    var secondWeekendDay: Int {
        let firstWeekDay = self.firstWeekday
        return (firstWeekDay - 1) >= 0 ? firstWeekDay - 1 : firstWeekDay - 1 + 7
    }

}