时间字符串
string timestr = "";
DateTime dt = DateTime.Now;
timestr = dt.ToString(); //2011-12-05 16:32:26
timestr = dt.ToShortDateString(); //2005-11-5
timestr = dt.ToShortTimeString(); //16:32
timestr = dt.ToLongDateString(); //2011-12-05
timestr = dt.ToLongTimeString(); //16:32:26
timestr = string.Format("{0:yyyy-HH-dd HH:mm:ss}", dt);//2011-12-05 16:32:26
timestr = string.Format("{0:yyyy/HH/dd}", dt); //2011/12/05
timestr = string.Format("{0:f}", dt); //2011年12月5日 16:32
timestr = string.Format("{0:F}", dt); //2011年12月5日 16:32:26
timestr = string.Format("{0:g}", dt); //2011/12/5 16:32
timestr = string.Format("{0:G}", dt); //2011/12/5 16:32:26
DateTime dt = DateTime.Now;
timestr = dt.ToString(); //2011-12-05 16:32:26
timestr = dt.ToShortDateString(); //2005-11-5
timestr = dt.ToShortTimeString(); //16:32
timestr = dt.ToLongDateString(); //2011-12-05
timestr = dt.ToLongTimeString(); //16:32:26
timestr = string.Format("{0:yyyy-HH-dd HH:mm:ss}", dt);//2011-12-05 16:32:26
timestr = string.Format("{0:yyyy/HH/dd}", dt); //2011/12/05
timestr = string.Format("{0:f}", dt); //2011年12月5日 16:32
timestr = string.Format("{0:F}", dt); //2011年12月5日 16:32:26
timestr = string.Format("{0:g}", dt); //2011/12/5 16:32
timestr = string.Format("{0:G}", dt); //2011/12/5 16:32:26