var today = new Date();
var dd = String(today.getDate()).padStart(2, '0');
var mm = String(today.getMonth() + 1).padStart(2, '0'); //January is 0!
var yyyy = today.getFullYear();
today = mm + '/' + dd + '/' + yyyy;
This will give you today's date in the format of mm/dd/yyyy.
Simply change today = mm +'/'+ dd +'/'+ yyyy; to whatever format you wish.