请问在javascript中如何比较时间大小

Question

不知道 这样行不行！
先用正则判断是否正确的日期
if((oldYear - newYear)>0){
   alert("旧日期大");
}
else{
   if(oldYear==newYear){
      if(oldMonth -newMonth > 0 ){
           alert("旧日期大");
        }
      else{
           if(oldMonth == newMonth){
              if(oldDay - newDay > 0){
                   alert("旧日期大");
                }
               else{
                   if(oldDay == newDay){
                      alert("日期相同");
                   }
                   else{
                     alert("新日期大");
                   }
               }
           }
           else{
              alert("新日期大");
           }
      }
   }
   else{
     alert("新日期大");
   }
}

Answer 1

我做的是             var Hassei_Year = Hassei_Y.selectedIndex;
   var Hassei_Month = Hassei_M.selectedIndex;
   var Hassei_Day = Hassei_D.selectedIndex;
           var today = new Date();            
           var Now_Year=today.getYear();
   var Now_Month=today.getMonths();
   var Now_Day=today.getDay();
           if(Hassei_Year -Now_Year>0){
       alert("输入时间不能大于当前时间!!!");
         return false;
}为什么不可以呢？？？？？？？？？

Answer 2

var year=2008;
var month=02;
var day=09;var nowDate = new Date();
var inputDate = new Date(year,month-1,day);if(inputDate>nowDate)
{
     alert("輸入時間大於當前時間");
}
else
{
     alert("輸入時間小於當前時間");
}

Answer 3

简化一下,希望对你有所帮助<script language="javascript">
      var   Hassei_Year = 2010; 
      var   today   =   new   Date();  
      var   Now_Year=today.getYear(); 
      if(Hassei_Year - Now_Year> 0){ 
            alert("输入时间不能大于当前时间!!!"); 
      }
</script>