js 判断两个日期之差例子

function better_time(strDateStart,strDateEnd){
   var strSeparator = "-"; //日期分隔符
   var strDateArrayStart;
   var strDateArrayEnd;
   var intDay;
   strDateArrayStart = strDateStart.split(strSeparator);
   strDateArrayEnd = strDateEnd.split(strSeparator);
   var strDateS = new Date(strDateArrayStart[0] + "/" + strDateArrayStart[1] + "/" + strDateArrayStart[2]);
   var strDateE = new Date(strDateArrayEnd[0] + "/" + strDateArrayEnd[1] + "/" + strDateArrayEnd[2]);
   intDay = (strDateE-strDateS)/(1000*3600*24);
   return intDay;
}

function checkTime(){
    var dateInp=$("#dateInp").val();
    var day1=Date.parse(dateInp.replace(/-/g, "/"));
    var nowDate = new Date();
    var dateStr = nowDate.getFullYear()+"/"+(nowDate.getMonth() + 1)+"/"+nowDate.getDate();               
    var day2=Date.parse(dateStr);
    var apartTime=day1-day2;
    var apartDay=parseInt(apartTime / (1000 * 60 * 60 * 24));
    if(apartDay ==0){
        alert("不能预约当天");
        return false;
    }else if (apartDay < 1 || apartDay > 3){
        alert("预约日期超出范围");
        return false;
    } 
}

var date1 = new Date("2013-11-29");
var date2 = new Date("2013-11-29");
console.log(date1.getTime() == date2.getTime()); //true

var date1 = new Date("2013-11-29");
var date2 = new Date("2013-11-29");
console.log(date1 == date2); //false