System.Globalization.ThaiBuddhistCalendar.ToDateTime C# (CSharp) Method

        public override DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era) {
            return (helper.ToDateTime(year, month, day, hour, minute, second, millisecond, era));
        }

        public void PosTest1()
        {
            System.Globalization.Calendar tbc = new ThaiBuddhistCalendar();
            Random rand = new Random(-55);
            int year = rand.Next(tbc.MinSupportedDateTime.Year + 543, tbc.MaxSupportedDateTime.Year + 543);
            int month = rand.Next(1, 13);
            int day;
            if (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);
            }

            int hour = rand.Next(0, 24);
            int minute = rand.Next(0, 60);
            int second = rand.Next(0, 60);
            int milliSecond = rand.Next(0, 1000);
            int era = 0;
            for (int i = 0; i < tbc.Eras.Length; i++)
            {
                era = tbc.Eras[i];
                DateTime dt = tbc.ToDateTime(year, month, day, hour, minute, second, milliSecond, era);
                DateTime desiredDT = tbc.ToDateTime(year, month, day, hour, minute, second, milliSecond);
                Assert.Equal(dt, desiredDT);
            }
        }