JSFiddle - React, Tailwind, and code Playground

JavaScript

function getDate(dateString) {
   var date = dateString ? new Date(dateString) : new Date();
   return date.toISOString().substring(0, 10);
}

console.log(getDate());
console.log(getDate("Fri May 22 2015 13:32:25 GMT-0400"));