Does ASP.NET MVC have any DateTime route constraints?

does ASP.NET MVC contain any route contraints baked into the code? if so, how do i define a date-time constraint?

eg. url:

http://mydomain.com/{versionDate}/{controller}/{action}
http://mydomain.com/2010-01-20/search/posts

cheers :)

I ended up making my own route constraint. only took a few mins.

using System;
using System.Web;
using System.Web.Routing;

namespace Whatever.Your.Funky.Cold.Medina.Namespace.Is
{
    public class DateTimeRouteConstraint : IRouteConstraint
    {
        #region IRouteConstraint Members

        public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values,
                          RouteDirection routeDirection)
        {
            DateTime dateTime;

            return DateTime.TryParse(values[parameterName] as string, out dateTime);
        }

        #endregion
    }
}

simple :P