MVC datetime list not saving

Question

I have a simple MVC4 model that adds a DateTime.Now to a List<DateTime>() list.

However when I do an EntityState.Modified, the changes are not being kept. I've debugged this by modifying another property in the model and that saves fine.

So I really am at a loss as to why this is not saving. If anyone has any ideas as to why its not saving that would be life saver material:

The Model:

public class Page
{
    public int Id { get; set; }
    public string PageURL { get; set; }
    public string Name { get; set; }
    public string Title { get; set; }
    public List<DateTime> Visits { get; set; }

    public Page()
    {
      Visits = new List<DateTime>();
    }

}

Here's my code:

private ApplicationDbContext db = new ApplicationDbContext();

   public ActionResult CookiePolicy()
   {
        var page = db.Pages.FirstOrDefault(c => c.PageURL == "cookiepolicy");

        page.Visits.Add(DateTime.Now); // this list of datetime objects does not get updated
        page.Title = "test "; //but this property does
        ViewBag.Title = page.Title;

        db.Entry(page).State = EntityState.Modified;
        db.SaveChanges();

        return View(page);
    }

Answer 1

Edit Fabio Luz mentioned:

"collection of primitive types (like int, DateTime, bool) are not supported"

So the solution below seems like the right option.

Ok, so after some deliberation. I decided to create a new model called vist and have this as the list instead of datetime:

public class Visit
{
    public int Id { get; set; }
    public DateTime DateTime { get; set; }
    public BrowserType BrowserType { get; set; }
    public String Duration { get; set; }

    public int PageId { get; set; }
    public virtual Page Page { get; set; }

    public Visit()
    {
        DateTime = DateTime.Now;
        BrowserType = BrowserType.Other;
    }
}

There are benefits to this. Now I can store more information then just the datetime.

So for anyone who had the same problem as me. Consider pushing it out into its own model for greater flexibility.