System.Globalization.JulianCalendar.DateToTicks C# (CSharp) Method

        internal long DateToTicks(int year, int month, int day)
        {
            int[] days = (year % 4 == 0)? DaysToMonth366: DaysToMonth365;
            int y = year - 1;
            int n = y * 365 + y / 4 + days[month - 1] + day - 1;
            // Gregorian 1/1/0001 is Julian 1/3/0001. n * TicksPerDay is the ticks in JulianCalendar.
            // Therefore, we subtract two days in the following to convert the ticks in JulianCalendar
            // to ticks in Gregorian calendar.
            return ((n - 2) * TicksPerDay);
        }

        /// <summary>Returns a <see cref="T:System.DateTime" /> that is the specified number of months away from the specified <see cref="T:System.DateTime" />.</summary>
        /// <param name="time">The <see cref="T:System.DateTime" /> to which to add months. </param>
        /// <param name="months">The number of months to add. </param>
        /// <returns>The <see cref="T:System.DateTime" /> that results from adding the specified number of months to the specified <see cref="T:System.DateTime" />.</returns>
        /// <exception cref="T:System.ArgumentException">The resulting <see cref="T:System.DateTime" /> is outside the supported range. </exception>
        /// <exception cref="T:System.ArgumentOutOfRangeException">
        ///         <paramref name="months" /> is less than -120000.-or-
        ///         <paramref name="months" /> is greater than 120000. </exception>
        // Token: 0x06002F49 RID: 12105 RVA: 0x000B53F8 File Offset: 0x000B35F8
        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  = JulianCalendar.GetDatePart(time.Ticks, 0);
            int num2 = JulianCalendar.GetDatePart(time.Ticks, 2);
            int num3 = JulianCalendar.GetDatePart(time.Ticks, 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;
            }
            int[] array = (num % 4 == 0 && (num % 100 != 0 || num % 400 == 0)) ? JulianCalendar.DaysToMonth366 : JulianCalendar.DaysToMonth365;
            int   num5  = array[num2] - array[num2 - 1];

            if (num3 > num5)
            {
                num3 = num5;
            }
            long ticks = JulianCalendar.DateToTicks(num, num2, num3) + time.Ticks % 864000000000L;

            Calendar.CheckAddResult(ticks, this.MinSupportedDateTime, this.MaxSupportedDateTime);
            return(new DateTime(ticks));
        }