C# 时间与时间戳互转 13位

/// <summary>
        /// 将c# DateTime时间格式转换为Unix时间戳格式
        /// </summary>
        /// <param name="time">时间</param>
        /// <returns>long</returns>
        public static long ConvertDateTimeToInt(System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(, , , , , , ));
            long t = (time.Ticks - startTime.Ticks) / ;   //除10000调整为13位
            return t;
        }
        /// <summary>
        /// 时间戳转为C#格式时间
        /// </summary>
        /// <param name=”timeStamp”></param>
        /// <returns></returns>
        private DateTime ConvertStringToDateTime(string timeStamp)
        {
             DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(, , ));
             long lTime = long.Parse(timeStamp + "");
             TimeSpan toNow = new TimeSpan(lTime);
             return dtStart.Add(toNow);
        }