System.Globalization.TaiwanCalendar.IsLeapYear C# (CSharp) Method

        public override bool IsLeapYear(int year, int era) {
            return (helper.IsLeapYear(year, era));
        }

        public void PosTest2()
        {
            System.Globalization.Calendar tc = new TaiwanCalendar();
            Random rand = new Random(-55);
            int year = rand.Next(tc.MinSupportedDateTime.Year, tc.MaxSupportedDateTime.Year - 1911);
            int month = rand.Next(1, 12);
            int day;
            if (tc.IsLeapYear(year))
            {
                day = rand.Next(1, _DAYS_PER_MONTHS_IN_LEAP_YEAR[month] + 1);
            }
            else
            {
                day = rand.Next(1, _DAYS_PER_MONTHS_IN_NO_LEAP_YEAR[month] + 1);
            }

            DateTime dt = new DateTime(year, month, day);
            int addvalue;
            if ((tc.MinSupportedDateTime.Year - year) < -1000)
            {
                addvalue = rand.Next(-1000 * 12, 0);
            }
            else
            {
                addvalue = rand.Next((tc.MinSupportedDateTime.Year - year) * 12, 0);
            }

            VerificationHelper(dt, addvalue);
        }