C# json日期转换

                #region 日期转换
                reJson = Regex.Replace(reJson, @"\\/Date\((\d+)\)\\/", match =>
                {
                    DateTime datetime = new DateTime(1970, 1, 1);
                    datetime = datetime.AddMilliseconds(long.Parse(match.Groups[1].Value));
                    datetime = datetime.ToLocalTime();
                    return datetime.ToString("yyyy-MM-dd");
                });
                #endregion