JSFiddle - React, Tailwind, and code Playground

JavaScript

function check_date(str){
  try{
  	return str == new Date(str).toISOString()
 	}catch(e){
		return false;
  }
}

console.log(check_date('2015-02-01T13:02:49.073Z'));
console.log(check_date('2015-02-35T13:02:49.073Z'));
console.log(check_date('2015-02-29T13:02:49.073Z'));