code: public function getChangeDate($identifier)
      {
          $this->process->execute(
              sprintf(
                  'hg log --template "{date|rfc3339date}" -r %s',
                  ProcessExecutor::escape($identifier)
              ),
              $output,
              $this->repoDir
          );
  
          return new \DateTime(trim($output), new \DateTimeZone('UTC'));
      }
docs: {@inheritdoc}