using System;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using LiteDB;

​

namespace LiteDBFail

{

    class Program

    {

        static void Main(string[] args)

        {

            var mapper = new BsonMapper();

            mapper.RegisterType<DateTime>(

                value => value.ToString("o", CultureInfo.InvariantCulture), 

                bson => DateTime.ParseExact(bson, "o", CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind));

            using (var db = new LiteDatabase("instance.db", mapper) { UtcDate = true })

            {

                var expected = new Foo(new DateTime(637310234309996491, DateTimeKind.Utc));

                var col = db.GetCollection<Foo>();

                col.DeleteAll();

                col.Insert(expected);

                var actual = col.FindAll().First(); // InvalidCastException is thrown here

            }

​

        }

    }

​

    public class Foo

    {

        public Foo(DateTime value)

        {

            Value = value;

        }

​

        public DateTime Value { get; }

    }

}

​