到下一天某点的间隔

        public static int GetNextDayBySeconds()
        {
            // 1天时间差计算（零头） 
            DateTime dtNow = DateTime.Now;
            DateTime dtTmp = dtNow.AddDays(1.0);
            string sTmr = dtTmp.Year.ToString() + "-" + dtTmp.Month.ToString() + "-" + dtTmp.Day.ToString() + " 00:00:01";
            DateTime dtTmr = DateTime.Parse(sTmr);
            return (int)(dtTmr - dtNow).TotalSeconds;
        }