public class ObjectClass
        {
            public object Value { get; set; }
        }

        [SetUp]
        public void Register()
        {
            var serializer = new Bson.Serialization.Serializers.DateTimeSerializer(DateTimeKind.Local);
            BsonSerializer.RegisterSerializer(typeof(DateTime), serializer);
        }

        [Test]
        public void RegisterTest()
        {

            var dt = new DateTime(2016, 1, 1, 0, 0, 0, DateTimeKind.Local);
            var o = new ObjectClass { Value = dt };

            var serilized = o.ToJson();
            var restored = BsonSerializer.Deserialize<ObjectClass>(serilized);

            Assert.AreEqual(dt, restored.Value);
            Assert.AreEqual(dt.Kind, ((DateTime)restored.Value).Kind);
        }