jquery获取当前时间比较日期

//获取当前时间,格式 2015-09-05 10:00:00.000

        function getnowtime() {

            var nowtime = new Date();

            var year = nowtime.getFullYear();

            var month = padleft0(nowtime.getMonth() + 1);

            var day = padleft0(nowtime.getDate());

            var hour = padleft0(nowtime.getHours());

            var minute = padleft0(nowtime.getMinutes());

            var second = padleft0(nowtime.getSeconds());

            var millisecond = nowtime.getMilliseconds(); millisecond = millisecond.toString().length == 1 ? "00" + millisecond : millisecond.toString().length == 2 ? "0" + millisecond : millisecond;

            return year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + second + "." + millisecond;

        }

        //补齐两位数

        function padleft0(obj) {

            return obj.toString().replace(/^[0-9]{1}$/, "0" + obj);

        }

 

 

$("#selectbtn").click(function(){
var dates=$("#timearea").val();
var arr=new Array();
arr=dates.split(" - ");
var now=getnowtime();
alert(arr[0]);
alert(now);
if($("#timearea").val()==''){
alert("请选择时间段");
}else if(arr[0]>now){
alert("查询起始日期不能大于当前日期");
}else{
$("#select").submit();
}


});