public class IntegerToTimeConverter : IValueConverter
        {
                public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
                {
          var time = DateTime.ParseExact("12.10", "HH.mm", CultureInfo.InvariantCulture).TimeOfDay;
          return time.TotalMinutes;
                }

                public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
                {
                        if(value is int)
                        {
              return TimeSpan.FromMinutes((int)value).ToString(@"hh\.mm");
                        }
                        return "N/A";
                }
        }