Checking the date order of the current locale

DateOrder.swift

extension Locale {
    enum DateOrder {
        case DayFirst, MonthFirst, YearFirst
    }
    
    func dateOrder() -> DateOrder {
        guard let formatter = DateFormatter.dateFormat(fromTemplate: "MMMMdY", options: 0, locale: self) else {
            return .DayFirst
        }
        
        if formatter.hasPrefix("Y") {
            return .YearFirst
        }
        
        if formatter.hasPrefix("M") {
            return .MonthFirst
        }
        
        return .DayFirst
    }
}