private void GroupNotesByDate()
        {
            DateTime date = DateTime.MinValue;

            foreach (var vm in Notes)
            {
                vm.SetIsFirstInADay(false);
                var taskStarted = dailyTimeCalculation.GetTaskDate(vm.Model);
                if (date == DateTime.MinValue)
                {
                    date = taskStarted;
                }
                if (taskStarted > date)
                {
                    vm.SetIsFirstInADay(true);
                    date = taskStarted;
                }
            }
        }