JSFiddle - React, Tailwind, and code Playground

by Felis Catus

HTML

<input type="datetime-local">
<button>
clock
</button>

JavaScript

(function(){
	document.querySelector('input').value='2020-10-02T21:10';
  document.querySelector('button').addEventListener('click', function(){
  	console.log(document.querySelector('input').value);
  })
})()