function pad2(n) {
return (n < 10 ? '0' : '') + n;
}
var date = new Date();
var month = pad2(date.getMonth()+1);//months (0-11)
var day = pad2(date.getDate());//day (1-31)
var year= date.getFullYear();
var formattedDate = year+"-"+month+"-"+day;
alert(formattedDate); //2021-02-28