How to display the time in 24 hour format using datetimepicker?

Question

I’m trying to display in PM format, but whenever I select in timepicker it arrow as AM.

$('.datetimepicker').datetimepicker({
    lang: 'pt-BR',
    timepicker: true,
    format: 'd/m/Y h:i'
});

When I select the time, example 21:00 it arrow as 09:00:

Answer 1

Simple, you are reporting in time format h in minuscule, so that it works in mode 24 hours you must inform him in capital letters H.

jQuery.datetimepicker.setLocale('pt-BR');
$('#datetimepicker').datetimepicker({
    timepicker: true,
    format: 'd/m/Y H:i'
});

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jquery-datetimepicker/2.5.4/jquery.datetimepicker.min.css">
<input id="datetimepicker" type="text" >
<script src="https://code.jquery.com/jquery-2.2.4.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-datetimepicker/2.5.4/build/jquery.datetimepicker.full.js"></script>

You can see in the documentation this one among other examples.