if (start != -1 && (!SelectedDays[i] || i == SelectedDays.Length - 1))
                {
                    if (cnt + 1 < SelectedDays.Length)
                        dayString += $"{(dayString.Length > 0 ? "," : "")}{start}{(cnt > 0 ? $"-{start + cnt}" : "")}";
                    else
                        dayString = "*";

                    start = -1;
                    cnt = 0;
                }