System.Globalization.KoreanCalendar.GetMonth C# (CSharp) Method

        public override int GetMonth(DateTime time) {
            return (helper.GetMonth(time));
        }

 public void PosTest2()
 {
     System.Globalization.Calendar kC = new KoreanCalendar();
     DateTime maxDT = DateTime.MaxValue;
     DateTime expectedValue = new GregorianCalendar().ToDateTime(maxDT.Year, maxDT.Month, maxDT.Day, 0, 0, 0, 0);
     DateTime actualValue;
     actualValue = kC.AddMonths(expectedValue, -2);
     Assert.Equal(kC.GetMonth(expectedValue) - 2, kC.GetMonth(actualValue));
 }