public static IEnumerable<object[]> Format_String_TestData_R()
{
yield return new object[] { DateTime.MaxValue, "Fri, 31 Dec 9999 23:59:59 GMT" };
yield return new object[] { DateTime.MinValue, "Mon, 01 Jan 0001 00:00:00 GMT" };
yield return new object[] { new DateTime(1906, 8, 15, 7, 24, 5, 300), "Wed, 15 Aug 1906 07:24:05 GMT" };
}