gistfile1.txt

using System;

using MongoDB.Bson;
using MongoDB.Bson.DefaultSerializer;
using MongoDB.Bson.Serialization;
using MongoDB.Driver;

namespace ConsoleApplication1 {
    public class Model {
        public DateTime DateTimeProperty { get; set; }
    }

    public static class Program {
        public static void Main(string[] args) {
            var server = MongoServer.Create();
            var database = server["test"];
            var collection = database["test"];
            collection.RemoveAll();

            var localTime = new DateTimeSerializationOptions { Kind = DateTimeKind.Local };
            BsonClassMap.RegisterClassMap<Model>(cm => {
                cm.MapProperty(c => c.DateTimeProperty)
                    .SetSerializationOptions(localTime);
            });

            var m1 = new Model { DateTimeProperty = DateTime.Now };
            var bson = m1.ToBson();
            var m2 = BsonSerializer.Deserialize<Model>(bson);
            var document = BsonSerializer.Deserialize<BsonDocument>(bson);
        }
    }
}