public DayStatItem(DateTime _date)
 {
     //   generalEntity = _ent;
     parentDay =ViewModel.generalEntity.DayStats.Create();
     ViewModel.generalEntity.DayStats.Add(parentDay);
     DateStat = _date;
     LastAnswerTime = DateTime.Now;
 }
 public DayStatItem(DayStat _parent)
 {
     parentDay = _parent;
 }