Angularjs验证用户输入的字符串是否为日期时间

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace Insus.NET.Controllers
{
 public class CommonsController : Controller
 {
 public JsonResult ValidateDate(string date)
 {
  object _Data;
  DateTime dt;
  if (DateTime.TryParse(date, out dt))
  {
  _Data = new { result = true };
  }
  else
  {
  _Data = new { result = false };
  }
  return new JsonResult
  {
  Data = _Data,
  ContentEncoding = System.Text.Encoding.UTF8,
  JsonRequestBehavior = JsonRequestBehavior.AllowGet
  };
 }
 }
}

airExpressApp.directive('validateDate', function ($http, $q) {
 return {
 restrict: 'AE',
 require: 'ngModel',
 link: function ($scope, element, attributes, ngModelController) {
  ngModelController.$asyncValidators.dataValid = function (modelValue, viewValue) {
  var deferred = $q.defer();
  var obj = {};
  obj.date = modelValue;
  $http({
   method: 'POST',
   url: '/Commons/ValidateDate',
   dataType: 'json',
   headers: {
   'Content-Type': 'application/json; charset=utf-8'
   },
   data: JSON.stringify(obj),
  }).then(function (response) {
   if (ngModelController.$isEmpty(modelValue) || response.data.result) {
   deferred.resolve();
   } else {
   deferred.reject();
   }
  });
  return deferred.promise;
  };
 }
 }
});