BuildFeed/BuildFeed/Code/DateTimeModelBinder.cs

using System;
using System.Globalization;
using System.Web.Mvc;

namespace BuildFeed.Code
{
   public class DateTimeModelBinder : DefaultModelBinder
   {
      public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
      {
         ValueProviderResult value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);

         DateTime retValue;
         bool success = DateTime.TryParse(value.AttemptedValue, CultureInfo.CurrentUICulture.DateTimeFormat, DateTimeStyles.AllowWhiteSpaces, out retValue);

         if (!success)
         {
            success = DateTime.TryParseExact(value.AttemptedValue, "yyMMdd-HHmm", CultureInfo.InvariantCulture, DateTimeStyles.AllowWhiteSpaces, out retValue);
         }

         return success
            ? retValue as DateTime?
            : null;
      }
   }
}