JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="dt" />
<input type="button" id="validate" value="validate" />

JavaScript

$(document).ready(function() {
    $('#validate').click( function() {
        if (isNaN(Date.parse($('#dt').val())) == true)
            alert('date is invalid!');
        else
            alert('valid date');
    });
});