this.Label6.Text = "当前时间:" + System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");    2014-11-29 15:03:04

this.Label6.Text = "当前时间:" + System.DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");    2014-11-29 03:03:04

05-08 08:25