JSFiddle - React, Tailwind, and code Playground

HTML

<html>
  <body>
    <p id="input">0001-01-01T00:00:00</p>
    <p id="output"></p>
    <button onclick="getLocalTime()">Click</button>
  </body>
</html>

JavaScript

getLocalTime = function () {
		var utcDateStr = document.getElementById('input').innerHTML ;
    var utcDate = new Date(utcDateStr);
    var offset = new Date().getTimezoneOffset() * 60000;
    var localDate = new Date(utcDate.getTime() - offset);
    var localDateStr = localDate.toLocaleString();
    document.getElementById('output').innerHTML =localDateStr;
};