获取北京时间时间戳

  ///

        /// 获取北京时间时间戳
        ///

        public static long GetBeiJingTimestamp(DateTime? dateTime)
        {
            if (dateTime == null)
            {
                return 0;
            }
            DateTime dt = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            var timestampMillisecond = (dateTime.Value.Ticks - dt.Ticks) / 10000;
            var timestampSecond = Math.Round(Convert.ToDouble(timestampMillisecond / 1000));
            timestampSecond -= 28800;
            return Convert.ToInt64(timestampSecond);
        }