DateTime data_today = DateTime.Now.AddDays(-1);         Response.Write("所需记录的时间为" +data_today + "<br>");                 DateTime nowdate = DateTime.Now;         Response.Write("当前时间为为" + nowdate + "<br>");         TimeSpan ts = nowdate.Subtract(data_today);            // 时间差         Response.Write("两个时间之间的相差是:" + ts + "<br>");

        if (ts.Days > 0)                                      //读取数据库的时间并判断与现在的时间-1天之间的时间间隔是否大于0         {

        }         else         {           }