时间戳相加

        private static DateTime GetTime(string timeStamp)
        {

            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));

            long lTime = long.Parse(timeStamp + "0000000");

            TimeSpan toNow = new TimeSpan(lTime);
            return dtStart.Add(toNow);

        }