JSFiddle - React, Tailwind, and code Playground

JavaScript

function formatDate(date){

    var dd = date.getDate();
    var mm = date.getMonth()+1;
    var yyyy = date.getFullYear();
    if(dd<10) {dd='0'+dd}
    if(mm<10) {mm='0'+mm}
    date = mm+'/'+dd+'/'+yyyy;
    return date
 }

var dates = Array.apply(null, new Array(7))
     .map(function() {
         return new Date();
     })
     .map(function(v, i) {
         v.setDate(v.getDate() - i);
         return v;
     })
     .map(function(v) {
         return formatDate(v);
     })
     .reverse()
     .join(',');

console.log(dates);