JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input id="DateTime" name="DateTime" type="" value="">

JavaScript

function dateTime() {
  return new Date($.now());
}

$("#DateTime").attr("value", dateTime());