public static IEnumerable<object[]> AddMilliseconds_TestData()
{
yield return new object[] { new DateTime(1986, 8, 15, 10, 20, 5, 70), 10, new DateTime(1986, 8, 15, 10, 20, 5, 80) };
yield return new object[] { new DateTime(1986, 8, 15, 10, 20, 5, 70), 0, new DateTime(1986, 8, 15, 10, 20, 5, 70) };
yield return new object[] { new DateTime(1986, 8, 15, 10, 20, 5, 70), -10, new DateTime(1986, 8, 15, 10, 20, 5, 60) };
}