Date::getFormats

static function getFormats()
{
	$formats = parent::getFormats();
	$formats['server'] = [
		'callable'  => 'formatValueServer',
		'separator' => ', ',
	];

	$formats['author'] = $formats['responsible'] = [
		'callable'  => 'formatValueAuthor',
		'separator' => ', ',
	];

	return $formats;
}