public void OneDayBeforeAction()
        {
            IsBusy = true;

            DayList.RemoveAt(DayList.Count - 1);

            DayList.Insert(0, EntireMonth[DayList.First().Date.Day - 2]);

            IsBusy = false;
        }
 public bool OneDayBeforeAllow()
 {
     return(!IsBusy && DayList.First().Date.Day > 1);
 }