I can not get the calendar to run correctly, when I click on a button if it looks good. but if you do not press anything, you see only the frame. It's the datetimepicker of jquery
$('.datepicker').datetimepicker({
inline: true,
sideBySide: true
});
$.datetimepicker.setLocale('es');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-datetimepicker/2.5.4/jquery.datetimepicker.full.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/jquery-datetimepicker/2.5.4/build/jquery.datetimepicker.min.css" rel="stylesheet"/>
<div class="datepicker"></div>