System.Globalization.HebrewCalendar.GetDaysInMonth C# (CSharp) Method

        public override int GetDaysInMonth(int year, int month, int era) {
            CheckEraRange(era);
            int hebrewYearType = GetHebrewYearType(year, era);
            CheckHebrewMonthValue(year, month, era);

            BCLDebug.Assert(hebrewYearType>= 1 && hebrewYearType <= 6,
                "hebrewYearType should be from  1 to 6, but now hebrewYearType = " + hebrewYearType + " for hebrew year " + year);
            int monthDays = m_lunarMonthLen[hebrewYearType, month];
            if (monthDays == 0) {
                throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
            }
            return (monthDays);
        }

        [Test, Timeout(300000)] // Can take a long time under NCrunch.
        public void BclThroughHistory_Scriptural()
        {
            Calendar bcl = new HebrewCalendar();
            var noda = CalendarSystem.HebrewScriptural;

            // The min supported date/time starts part way through the year
            var minYear = bcl.GetYear(bcl.MinSupportedDateTime) + 1;
            // The max supported date/time ends part way through the year
            var maxYear = bcl.GetYear(bcl.MaxSupportedDateTime) - 1;

            // Can't use BclEquivalenceHelper for this one, because of the month conversions.
            for (int year = minYear; year <= maxYear; year++)
            {
                int months = bcl.GetMonthsInYear(year);
                Assert.AreEqual(months, noda.GetMonthsInYear(year));
                for (int civilMonth = 1; civilMonth <= months; civilMonth++)
                {
                    int scripturalMonth = HebrewMonthConverter.CivilToScriptural(year, civilMonth);
                    Assert.AreEqual(bcl.GetDaysInMonth(year, civilMonth), noda.GetDaysInMonth(year, scripturalMonth),
                        "Year: {0}; Month: {1} (civil)", year, civilMonth);
                    for (int day = 1; day < bcl.GetDaysInMonth(year, civilMonth); day++)
                    {
                        DateTime bclDate = new DateTime(year, civilMonth, day, bcl);
                        LocalDate nodaDate = new LocalDate(year, scripturalMonth, day, noda);
                        Assert.AreEqual(bclDate, nodaDate.AtMidnight().ToDateTimeUnspecified(), "{0}-{1}-{2}", year, scripturalMonth, day);
                        Assert.AreEqual(nodaDate, LocalDateTime.FromDateTime(bclDate, noda).Date);
                        Assert.AreEqual(year, nodaDate.Year);
                        Assert.AreEqual(scripturalMonth, nodaDate.Month);
                        Assert.AreEqual(day, nodaDate.Day);
                    }
                }
            }
        }