/**
* Returns the valid creation date of a resource
*
* @param object $resource
* @param array $matter
* @param string $format
* @return string
*/
public function getDate(Resource $resource, array $matter = array(), $format = 'Y-m-d')
{
$date = $resource->getCTime();
if (!empty($matter['date'])) {
$date = $matter['date'];
} elseif (preg_match('~^((\\d{4})-(\\d{1,2})-(\\d{1,2})(?:[-_]*))~', $resource->getFilename(), $m)) {
$date = trim($m['0'], '-_ ');
}
if (ctype_digit($date)) {
$date = date('Y-m-d H:i:s', $date);
}
$dateTime = new \DateTime($date);
return $dateTime->format($format);
}
