How to set default configuration for Sonata sonata_type_date_picker

I know from Sonata Data Picker documentation that field configuration for sonata_type_date_picker can be passed with :

$builder
    ->add('publicationDateStart', 'sonata_type_datetime_picker', array(
            'dp_side_by_side'       => true,
            'dp_use_current'        => false,
            'dp_use_seconds'        => false,
    ))

But, is it possible to set some default configuration at an application level in a yml or xml file ?

One way you can achieve to set defaults for sonata's sonata_type_datetime_picker for application wide is to override the form type service for sonata_type_datetime_picker and in class parameter define your own class to handle defaults.

1) Create a service file in your bundle form_types.xml and override sonata's service like

<?xml version="1.0" encoding="UTF-8" ?>

<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
    <services>
        <service id="sonata.core.form.type.datetime_picker" class="Acme\DemoBundle\Form\Type\DateTimePickerType">
            <tag name="form.type" alias="sonata_type_datetime_picker" />
            <argument type="service" id="sonata.core.date.moment_format_converter" />
        </service>
    </services>
</container>

In above service you can see i have defined a class that lies in Acme\DemoBundle

2) Create a class in Acme\DemoBundle\Form\Type and name it as DateTimePickerType and extend this with sonata's BasePickerType class

/**
 * {@inheritdoc}
 */
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    /**
     * Here do what ever you need to change
     */
    $resolver->setDefaults(array_merge($this->getCommonDefaults(), array(
        'dp_use_minutes'     => true,
        'dp_use_seconds'     => true,
        'dp_minute_stepping' => 1,
    )));
}

3) Import your service file in main configuration file i.e config.yml

imports:
    - { resource: parameters.yml }
    - { resource: security.yml }
    - { resource: @AcmeDemoBundle/Resources/config/form_types.xml }

Full code demo visit Git Hub