JS日期操作

1、js设置倒计时

$(function(){

//一秒钟刷新一次
	setInterval(getTime, 1000);
	getTime();
});

function getTime(){
    //在firefox和ie下，如果时间里是-分割，得到的时间是NaN，换成/就好了
	var oDateEnd=new Date('{$group_buy.end_time}'.replace("-", "/").replace("-", "/"));
	var oDateNow=new Date();
	var iDay=0;
	var iHour=0;
	var iMin=0;
	var iSec = 0;
	
	iRemain=(oDateEnd.getTime()-oDateNow.getTime())/1000;
	if(iRemain > 0){
		iDay=parseInt(iRemain/86400);
		iRemain%=86400;
		
		iHour=parseInt(iRemain/3600);
		iRemain%=3600;
		
		iMin=parseInt(iRemain/60);
		iRemain%=60;

		iSec=parseInt(iRemain);

	}
	$('#dountdownDay').text(iDay);
	$('#dountdownHour').text(iHour);
	$('#dountdownMin').text(iMin);
	$('#dountdownSec').text(iSec);
}

2、js比较日期大小

function checkTime(){
	var now = new Date(CurentTime());
	if(now>endTime){
		alert('活动已经结束了，不能报名了，下次赶早吧');
		return false;
	}
	if(now>startTime){
		alert('活动已经开始不能报名了，下次赶早吧');
		return false;
	}
	return true;
}

function CurentTime()
{ 
    var now = new Date();
    var year = now.getFullYear();       //年
    var month = now.getMonth() + 1;     //月
    var day = now.getDate();            //日
    var hh = now.getHours();            //时
    var mm = now.getMinutes();          //分
    var clock = year + "/";
   
    if(month < 10)
        clock += "0";
   
    clock += month + "/";
   
    if(day < 10)
        clock += "0";
       
    clock += day + " ";
   
    if(hh < 10)
        clock += "0";
       
    clock += hh + ":";
    if (mm < 10) clock += '0'; 
    clock += mm+":00"; 
    return(clock); 
}