C#利用TimeSpan计算两个时间差

C#利用TimeSpan计算两个时间之间的时间差 

传入两个时间参数即可得到准确的时间差

public static string DateDiff(DateTime DateTime1, DateTime DateTime2)
    {
        string dateDiff = "";
        TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
        TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
        TimeSpan ts = (TimeSpan)(ts2 - ts1);  
        if (Convert.ToInt32(ts.Days.ToString()) < 0)
           dateDiff = "<font color=red>已经过期</font>";
        else
            dateDiff = ts.Days.ToString()+"天";
        return dateDiff;
    }