C#两时间之间的比较

C#两时间之间的比较

1、比较时间大小的实验 ：

     string  st1 = " 12:13 " ;
     string  st2 = " 14:14 " ;
    DateTime dt1 = Convert.ToDateTime(st1);
    DateTime dt2 = Convert.ToDateTime(st2);
    DateTime dt3 = DateTime.Now;

     if (DateTime.Compare(dt1,dt2) > 0 )
        msg.Text = st1 + " > " + st2;
     else
        msg.Text = st1 + " < " + st2;
    msg.Text += " \r\n " + dt1.ToString();
     if (DateTime.Compare(dt1,dt3) > 0 )
        msg.Text += " \r\n " + st1 + " > " + dt3.ToString();
     else
        msg.Text += " \r\n " + st1 + " < " + dt3.ToString();

2、计算两个时间差值的函数，返回时间差的绝对值

     private   string  DateDiff(DateTime DateTime1,DateTime DateTime2)
    {
         string  dateDiff = null ;
         try
        {
            TimeSpan ts1     = new  TimeSpan(DateTime1.Ticks);
            TimeSpan ts2     = new  TimeSpan(DateTime2.Ticks);
            TimeSpan ts     = ts1.Subtract(ts2).Duration();
            dateDiff     =     ts.Days.ToString() + " 天 " +
                        ts.Hours.ToString() + " 小时 " +
                        ts.Minutes.ToString() + " 分钟 " +
                        ts.Seconds.ToString() + " 秒 " ;
        }
         catch
        {
        }
         return  dateDiff;
    }

3、实现计算DateTime1－36天＝DateTime2的功能

    TimeSpan ts = new  TimeSpan( 40 , 0 , 0 , 0 );
    DateTime dt2 = DateTime.Now.Subtract(ts);
    msg.Text = DateTime.Now.ToString() + " - " + ts.Days.ToString() + " 天\r\n " ;
    msg.Text += dt2.ToString();