System.Globalization.UmAlQuraCalendar.CheckYearRange C# (CSharp) Method

        internal void CheckYearRange(int year, int era)  {
            CheckEraRange(era);
            if (year < MinCalendarYear || year > MaxCalendarYear)  {
                throw new ArgumentOutOfRangeException(
                            "year",
                            String.Format(
                                CultureInfo.CurrentCulture,
                                Environment.GetResourceString("ArgumentOutOfRange_Range"),
                                MinCalendarYear,
                                MaxCalendarYear));
            }
        }

        /// <summary>Calculates a date that is a specified number of months away from a specified initial date.</summary>
        /// <param name="time">The date to which to add months. The <see cref="T:System.Globalization.UmAlQuraCalendar" /> class supports only dates from 04/30/1900 00.00.00 (Gregorian date) through 11/16/2077 23:59:59 (Gregorian date).</param>
        /// <param name="months">The positive or negative number of months to add. </param>
        /// <returns>The date yielded by adding the number of months specified by the <paramref name="months" /> parameter to the date specified by the <paramref name="time" /> parameter.</returns>
        /// <exception cref="T:System.ArgumentException">The resulting date is outside the range supported by the <see cref="T:System.Globalization.UmAlQuraCalendar" /> class. </exception>
        /// <exception cref="T:System.ArgumentOutOfRangeException">
        ///         <paramref name="months" /> is less than -120,000 or greater than 120,000. -or-
        ///         <paramref name="time" /> is outside the range supported by this calendar.</exception>
        // Token: 0x06002ED8 RID: 11992 RVA: 0x000B3E20 File Offset: 0x000B2020
        public override DateTime AddMonths(DateTime time, int months)
        {
            if (months < -120000 || months > 120000)
            {
                throw new ArgumentOutOfRangeException("months", string.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Range"), -120000, 120000));
            }
            int num  = this.GetDatePart(time, 0);
            int num2 = this.GetDatePart(time, 2);
            int num3 = this.GetDatePart(time, 3);
            int num4 = num2 - 1 + months;

            if (num4 >= 0)
            {
                num2 = num4 % 12 + 1;
                num += num4 / 12;
            }
            else
            {
                num2 = 12 + (num4 + 1) % 12;
                num += (num4 - 11) / 12;
            }
            if (num3 > 29)
            {
                int daysInMonth = this.GetDaysInMonth(num, num2);
                if (num3 > daysInMonth)
                {
                    num3 = daysInMonth;
                }
            }
            UmAlQuraCalendar.CheckYearRange(num, 1);
            DateTime result = new DateTime(UmAlQuraCalendar.GetAbsoluteDateUmAlQura(num, num2, num3) * 864000000000L + time.Ticks % 864000000000L);

            Calendar.CheckAddResult(result.Ticks, this.MinSupportedDateTime, this.MaxSupportedDateTime);
            return(result);
        }