public void ToDateTimeTest()
        {
            var max     = new DateTime(1980, 1, 1);
            var min     = new DateTime(1911, 1, 1);
            var content = new Dictionary <string, object> {
                { "Max", max }, { "Min", min }
            };
            var target = new JsonContainer(content);

            DateTime actual = target.ToDateTime("Max");

            Assert.AreEqual(actual, max);

            actual = target.ToDateTime("Min");
            Assert.AreEqual(actual, min);
        }