JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" />

JavaScript

$(document).ready(function () {
        var currentdate=new Date()
        var datetime = 
                    + currentdate.getFullYear() + ""
                    + currentdate.getMonth() + ""        
                    + currentdate.getDate() + ""
                    + currentdate.getHours() + ""
                    + currentdate.getMinutes() + ""
                    + currentdate.getSeconds();
        
        $('input').val(datetime);
        
    });