To ensure that you get the current date in JavaScript, start with using new Date() to generate a new Date object containing the current date and time.
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; 
document.write(today);
 
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.