change date format in date.now() funcyion in js with time code example

Example 1: return a date time object in yyyy-mm-dd hr:min:sec

const str = (new Date()).toISOString().slice(0, 19).replace(/-/g, "/").replace("T", " ");

Example 2: getdate yyyy mm dd format javascript

let today = new Date();
let dd = today.getDate();

let mm = today.getMonth()+1; 
const yyyy = today.getFullYear();
if(dd<10) 
{
    dd=`0${dd}`;
} 

if(mm<10) 
{
    mm=`0${mm}`;
} 
today = `${mm}-${dd}-${yyyy}`;
console.log(today);
today = `${mm}/${dd}/${yyyy}`;
console.log(today);
today = `${dd}-${mm}-${yyyy}`;
console.log(today);
today = `${dd}/${mm}/${yyyy}`;
console.log(today);
// GET FUll DATE WITH DAY, MONTH and YEARS