what does iso date mean in js date formate code example

Example 1: get iso date javascript

var isoDate = new Date().toISOString()

Example 2: iso date javascript

const event = new Date('05 October 2011 14:48 UTC');
console.log(event.toString());
// expected output: Wed Oct 05 2011 16:48:00 GMT+0200 (CEST)
// (note: your timezone may vary)

console.log(event.toISOString());
// expected output: 2011-10-05T14:48:00.000Z