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+="rn"+dt1.ToString();
if(DateTime.Compare(dt1,dt3)>0)
msg.Text+="rn"+st1+">"+dt3.ToString();
else
msg.Text+="rn"+st1+"<"+dt3.ToString();
DateTime dt=DateTime.Parse("2010-07-24 11:45:20");
if(DateTime.Now>dt)
Response.Write("当前大于定义时间");
------------------------------------------------------- 如果只是时间的话,当前时间为
DateTime.Parse(DateTime.Now.ToString("HH:mm:ss"));
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rn";
msg.Text+=dt2.ToString();