JSFiddle - React, Tailwind, and code Playground

JavaScript

function zerofy(number){
    if(number < 10)
        number = "0" + number;
    
    return number;
}

var date = new Date("2018-08-31");
var day = zerofy(date.getDate());
var month = zerofy(date.getMonth());
var year = date.getFullYear();

var result = year + "," + month + "," + day

alert(result);