System.Globalization.JapaneseCalendar.ToFourDigitYear C# (CSharp) Method

        public override int ToFourDigitYear(int year) {
            if (year <= 0) {
                throw new ArgumentOutOfRangeException("year",
                    Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum"));
            }

            if (year > helper.MaxYear) {
                throw new ArgumentOutOfRangeException(
                            "year",
                            String.Format(
                                CultureInfo.CurrentCulture,
                                Environment.GetResourceString("ArgumentOutOfRange_Range"),
                                1,
                                helper.MaxYear));
            }
            return (year);
        }