protected override JsonResult Json(object data, string contentType, System.Text.Encoding contentEncoding, JsonRequestBehavior behavior)
        {
            return new ToJsonResult
            {
                Data = data,
                ContentEncoding = contentEncoding,
                ContentType 
 
= contentType,
                JsonRequestBehavior = behavior,
                FormateStr = "yyyy-MM-dd HH:mm:ss"
            };
        }
        protected JsonResult MyJson(object data)
        {
            return new ToJsonResult
            {
                Data = data,
                FormateStr 
 
= "yyyy-MM-dd"
            };
        }

 /// <summary>
    /// 說明：轉化為Jason
    /// 作者: CallmeYhz
    /// </summary>
    public class ToJsonResult : JsonResult
    {
        const string error = "該請求已被封鎖，因為敏感資訊透露給第三方網站，這是一個GET請求時使用的。為了可以GET請求，請設定JsonRequestBehavior AllowGet。";
        /// <summary>
 

        /// 格式化字串
        /// </summary>
        public string FormateStr
        {
            get;
            set;
        }
        /// <summary>
        /// 說明：重寫ExecueResult方法
        /// 作者：CallmeYhz    
        /// </summary>
        /// <param name="context"></param>
        public override void ExecuteResult(ControllerContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }
            if (JsonRequestBehavior == JsonRequestBehavior.DenyGet &&
                String.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
            {
                throw new InvalidOperationException(error);
            }
            HttpResponseBase response = context.HttpContext.Response;

            if (!String.IsNullOrEmpty(ContentType))
            {
                response.ContentType = ContentType;
            }
            else
            {
                response.ContentType = "application/json";
            }
            if (ContentEncoding != null)
            {
                response.ContentEncoding = ContentEncoding;
            }
            if (Data != null)
            {
                JavaScriptSerializer serializer = new JavaScriptSerializer();
                string jsonstring = serializer.Serialize(Data);
                //string hashOldPassword = @"\\/Date\((\param+)\+\param+\)\\/";
                string p = @"\\/Date\(\d+\)\\/";
                MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
                Regex reg = new Regex(p);
                jsonstring = reg.Replace(jsonstring, matchEvaluator);
                response.Write(jsonstring);
            }
        }

        /// <summary>
        /// 說明：將Json序列化的時間由/Date(1294499956278+0800)轉為字串
        /// 作者：CallmeYhz   
        /// </summary>
        private string ConvertJsonDateToDateString(Match m)
        {
            string result = string.Empty;
            string p = @"\d";
            var cArray = m.Value.ToCharArray();
            StringBuilder sb = new StringBuilder();
            Regex reg = new Regex(p);
            for (int i = 0; i < cArray.Length; i++)
            {
                if (reg.IsMatch(cArray[i].ToString()))
                {
                    sb.Append(cArray[i]);
                }
            }
            // reg.Replace(m.Value;
            DateTime dt = new DateTime(1970, 1, 1);
            dt = dt.AddMilliseconds(long.Parse(sb.ToString()));
            dt = dt.ToLocalTime();
            result = dt.ToString(this.FormateStr);
            return result;
        }
    }

將此程式碼新增到baseControle 中就可以了