Symfony3 Form Extension for use with Flatpickr javascript date/time pickers

FlatpickerDateTimeType.php

<?php
namespace MyBundle\Form\Extension;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\DateTimeType;

/**
 * Class FlatpickrDateTimeType
 * @package MyBundle\Form\Extension
 */
class FlatpickrDateTimeType extends AbstractType
{
    /**
     * @param OptionsResolver $resolver
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'widget' => 'single_text',
            'attr' => array(
                'placeholder' => 'Select a date...',
                'class' => "flatpickr datetime",
            ),
        ));
    }

    /**
     * @return mixed
     */
    public function getParent()
    {
        return DateTimeType::class;
    }
}

PostType.php

<?php

namespace MyBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use MyBundle\Form\Extension\FlatpickrDateTimeType;

/**
 * Class PostType
 * @package MyBundle\Form
 */
class PostType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array                $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add("publishDate", FlatPickrDateTimeType::class, array(
                'label' => 'Publish Date',
                'required' => false,
            ))
    }

    /**
     * @param OptionsResolver $resolver
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'MyBundle\Entity\Post',
        ));
    }
}

view.html.twig

{% extends 'base.html.twig' %}
{% block stylesheets %}
    {{ parent() }}
    <link rel="stylesheet" href="{{ asset('bower_components/flatpickr/dist/flatpickr.min.css') }}" />
{% endblock %}
{% block body %}
    {{ form_start(edit_form) }}
    {{ form_row(edit_form.publishDate) }}
    {{ form_rest(edit_form) }}
    {{ form_end(edit_form) }}
{% endblock %}

{% block javascripts %}
    {{ parent() }}
    <script src="{{ asset('bower_components/flatpickr/dist/flatpickr.min.js') }}"></script>
    <script type="text/javascript">
        flatpickr(".flatpickr.datetime", {
            enableTime: true
        });
    </script>
{% endblock %}

MERCIIIII, je cherches depuis tellement longtemps et enfin je trouve ici ce que je voulais encore un grand merci