public static IEnumerable<object[]> Format_String_TestData_O()
{
yield return new object[] { DateTime.MaxValue, "9999-12-31T23:59:59.9999999" };
yield return new object[] { DateTime.MinValue, "0001-01-01T00:00:00.0000000" };
yield return new object[] { new DateTime(1906, 8, 15, 7, 24, 5, 300), "1906-08-15T07:24:05.3000000" };
}