ASP.NET MVC格式化日期

using System;
using System.ComponentModel.DataAnnotations;

namespace MvcApplication1.Models
{
    public class Employee
    {
        public DateTime? JoinTime { get; set; }
    }
}

using System;
using System.Web.Mvc;
using MvcApplication1.Models;

namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View(new Employee(){JoinTime = DateTime.Now});
        }

    }
}

@model MvcApplication1.Models.Employee

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Index</h2>

@Html.EditorFor(model => model.JoinTime)

@model DateTime?
@Html.TextBox("", Model.HasValue ? Model.Value.ToString("yyyy-MM-dd") : "", new {@class = "date"})

using System;
using System.ComponentModel.DataAnnotations;

namespace MvcApplication1.Models
{
    public class Employee
    {
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime? JoinTime { get; set; }
    }
}

@model DateTime?
@Html.TextBox("", Model.HasValue ? @ViewData.TemplateInfo.FormattedModelValue : "", new {@class="date"})