public CalendarViewModel(bool isMultipleSelect, DateTime initDate)
        {
            _calendar = new CalendarModel(initDate, isMultipleSelect);

            PriorCommand = new Command(() =>
            {
                _calendar.PriorMonth();
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(YearMonthLabel)));

                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(SelectedDates)));

                RefreshChanges();
            });

            NextCommand = new Command(() =>
            {
                _calendar.NextMonth();
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(YearMonthLabel)));

                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(SelectedDates)));


                RefreshChanges();
            });
        }