Symfony DateTime form type, with 2 text input widgets

DateTimeType.php

<?php

namespace App\Core\Form\Type;


use Symfony\Component\Form\CallbackTransformer;
use Symfony\Component\Form\Extension\Core\DataTransformer\ArrayToPartsTransformer;
use Symfony\Component\Form\Extension\Core\DataTransformer\DataTransformerChain;
use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToArrayTransformer;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;

class DateTimeType extends \Symfony\Component\Form\Extension\Core\Type\DateTimeType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $parts = array('year', 'month', 'day', 'hour');
        $dateParts = array('year', 'month', 'day');
        $timeParts = array('hour');

        $builder
            ->addViewTransformer(new DataTransformerChain(array(
                new DateTimeToArrayTransformer($options['model_timezone'], $options['view_timezone'], $parts),
                new ArrayToPartsTransformer(array(
                    'date' => $dateParts,
                    'time' => $timeParts,
                )),
                new CallbackTransformer(function($value)
                {
                    return [
                        'date' => $value['date']['day'] . '/' . $value['date']['month'] . '/' . $value['date']['year'],
                        'time' => $value['time']['hour'] . ':00'
                    ];
                }, function($value)
                {
                    $buffer = explode('/', $value['date']);

                    return [
                        'date' => [ 'day' => $buffer[0], 'month' => $buffer[1], 'year' => $buffer[2] ],
                        'time' => [ 'hour' => (int) $value['time'] ]
                    ];
                })
            )))
            ->add('date', TextType::class)
            ->add('time', TextType::class)
        ;
    }

    /**
     * {@inheritdoc}
     */
    public function getBlockPrefix()
    {
        return 'datetime_picker';
    }
}

form_layout.html.twig

{% block datetime_widget -%}
    <div>
        {{- form_widget(form.date, { datetime: true } ) -}}
        {{- form_widget(form.time, { datetime: true } ) -}}
    </div>
{%- endblock %}