protected function getFormBase()
{
return $this->createFormBuilder()->add('server_timezone', 'timezone', array('label' => 'Server time zone', 'multiple' => FALSE, 'expanded' => FALSE, 'constraints' => array(new NotBlank())))->add('enable_caldav', 'checkbox', array('label' => 'CalDAV - Calendar service', 'required' => FALSE))->add('enable_carddav', 'checkbox', array('label' => 'CardDAV - Contact service', 'required' => FALSE))->add('enable_versioncheck', 'checkbox', array('label' => 'Check for updates on the admin dashboard', 'required' => FALSE));
}