JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" />

JavaScript

$(document).ready(function () {
        var currentdate=new Date();
       var month = currentdate.getMonth();
       var day = currentdate.getDate();
        if(month < 10){ month = '0' + month}
        if(day < 10){ day = '0' + day}
        
        var datetime = 
                    + currentdate.getFullYear() + ""
                    + month + ""        
                    + day + ""
                    + currentdate.getHours() + ""
                    + currentdate.getMinutes() + ""
                    + currentdate.getSeconds();
        
        $('input').val(datetime);
        
    });