Now Symfony DateType has 3 widget types: choice, text, single_text.

When using widget type choice the format is y-M-d and can't be changed, see: https://github.com/symfony/symfony/blob/v3.3.0/src/Symfony/Component/Form/Extension/Core/Type/DateType.php#L73

We have business requirement, that months always must be rendered as numbers (from 01 to 12). What is the best way to achieve this?