code: public function getChangeDate($identifier)
      {
          $identifier = '/' . trim($identifier, '/') . '/';
  
          preg_match('{^(.+?)(@\d+)?/$}', $identifier, $match);
          if (!empty($match[2])) {
              $path = $match[1];
              $rev = $match[2];
          } else {
              $path = $identifier;
              $rev = '';
          }
  
          $output = $this->execute('svn info', $this->baseUrl . $path . $rev);
          foreach ($this->process->splitLines($output) as $line) {
              if ($line && preg_match('{^Last Changed Date: ([^(]+)}', $line, $match)) {
                  return new \DateTime($match[1], new \DateTimeZone('UTC'));
              }
          }
  
          return null;
      }
docs: {@inheritdoc}