how to convert yyyy-mm--dd to dd-mm-yyyy in js code example

Example 1: javascript convert date to yyyy-mm-dd

// `date` is a `Date` object
const formatYmd = date => date.toISOString().slice(0, 10);

// Example
formatYmd(new Date());      // 2020-05-06

Example 2: get current date javascript yyyy-mm-dd

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