Why DateTime Version field is initialized with 0001.01.01 instead of DateTime.Now

DateTime.Now sets only after changing entity

Here is sample Code:

using System;
using System.Linq;
using Xtensive.Storage;
using Xtensive.Storage.Configuration;
using Project1.Model;

namespace Project1
{
    [Serializable]
    [HierarchyRoot]
    public class MyEntity : Entity
    {
        [Field, Key]
        public int Id { get; private set; }

        [Field(Length = 100)]
        public string Text { get; set; }

        [Field, Version]
        public DateTime Version { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var config = DomainConfiguration.Load("Default");
            var domain = Domain.Build(config);

            using (Session.Open(domain))
            {
                using (var transactionScope = Transaction.Open())
                {
                    var helloWorld = new MyEntity { Text = "Hello World!" };
                    transactionScope.Complete();
                }
            }

            using (Session.Open(domain))
            {
                using (var transactionScope = Transaction.Open())
                {
                    foreach (var myEntity in Query.All<MyEntity>())
                        Console.WriteLine(myEntity.Version);
                    transactionScope.Complete();
                }
            }

            using (Session.Open(domain))
            {
                using (var transactionScope = Transaction.Open())
                {
                    var helloWorld = Query.All<MyEntity>().First();
                    helloWorld.Text += ".";
                    transactionScope.Complete();
                }
            }

            using (Session.Open(domain))
            {
                using (var transactionScope = Transaction.Open())
                {
                    foreach (var myEntity in Query.All<MyEntity>())
                        Console.WriteLine(myEntity.Version);
                    transactionScope.Complete();
                }
            }
            Console.ReadKey();
        }
    }
}

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