JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-combined.min.css">
<link rel="stylesheet" href="http://tarruda.github.com/bootstrap-datetimepicker/assets/css/bootstrap-datetimepicker.min.css">
<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/js/bootstrap.min.js"></script>
<script src="http://tarruda.github.com/bootstrap-datetimepicker/assets/js/bootstrap-datetimepicker.min.js"></script>
<script src="http://tarruda.github.com/bootstrap-datetimepicker/assets/js/bootstrap-datetimepicker.pt-BR.js"></script>
<div id="dateId" class="input-append date">
    <input type="text" id="datetimepicker-input"></input>
    <span class="add-on">
        <i data-time-icon="icon-time" data-date-icon="icon-calendar"></i>
    </span>
</div>

JavaScript

var d = new Date();
var month = 6 ;//d.getMonth()+1;
var day = 10 //d.getDate();

var output =  "09-14-2019";

$("#datetimepicker-input").val(output + " 03:11:20");

$('#dateId').datetimepicker({
    language: 'en',
    format: 'MM/dd/yyyy hh:mm:ss'
});