Error Date on Form rendering (LogicException: Cannot use the "format" option of DateType when the html5 option is enabled)

[etiennerunge]

Q	A
Bug?	yes
New Feature?	no
Bundle Version	2.5.4
Sulu Version	2.6.5

Actual Behavior

Rendering Date (Symfony\Component\Form\Extension\Core\Type\DateType) doesn't work because of an error.

Expected Behavior

DateType should be rendered with default format without error

Steps to Reproduce

Add Date form field in form. This throws an error on page rendering: Cannot use the "format" option of "Symfony\Component\Form\Extension\Core\Type\DateType" when the "html5" option is enabled.

Possible Solutions

DateType field have by default html5 option value set to true.

But this is incompatible with the value of the format option set to IntlDateFormatter::LONG

// Sulu\Bundle\FormBundle\Dynamic\Types\DateType
        $type = TypeDateType::class;
        $translation = $field->getTranslation($locale);
        if ($translation && $translation->getOption('birthday')) {
            $type = BirthdayType::class;
        }
        $options['format'] = \IntlDateFormatter::LONG;
        $options['input'] = 'string';
        $builder->add($field->getKey(), $type, $options);

Could dateformat be configured in sulu form yaml config file, and html5 set to false?

Maybe this is relative to this issue : #49