js处理EXECl导入时间格式转换问题

function clsj(dates){
       var kdate = new Date(dates)
var year=kdate.getFullYear();
var month=kdate.getMonth() + 1;
var day= kdate.getDate();
if(month<10){
month='0'+month;
}
if(day<10){
day='0'+day;
}
        var resDate =  year+ '-' + month + '-' +day;
return resDate;
}

clsj(Sun Feb 2 00:00:00 UTC+0800 2020) //2020-02-02