如何比较两个时间的大小？

Question

DateTime t1 = new DateTime(100);
DateTime t2 = new DateTime(20);if (DateTime.Compare(t1, t2) >  0) Console.WriteLine("t1 > t2"); 
if (DateTime.Compare(t1, t2) == 0) Console.WriteLine("t1 == t2"); 
if (DateTime.Compare(t1, t2) <  0) Console.WriteLine("t1 < t2");

Answer 1

DateTime t1,t2,t3;
t3 = t1- t2;
int DayDis = t3.Day;

Answer 2

TimeSpan ts=DateTime.Now.AddDays(3)-DateTime.Now;
结果是3

Answer 3

TimeSpan ts=DateTime.Now-DateTime.Now;
if(ts.Ticks<0)
{
Response.Write("<");
}
else if(ts.Ticks>0)
{
Response.Write(">");
}
else
{
Response.Write("=");
}

Answer 4

DateTime.Parse(time1).ToOADate() - DateTime.Parse(time2).ToOADate() 
结果
>0 => time1>time2;
=0 => time1=time2;  
<0 => time1<time2;