code: public function getChangeDate($identifier)
      {
          if ($this->fallbackDriver) {
              return $this->fallbackDriver->getChangeDate($identifier);
          }
  
          $resource = sprintf(
              'https://api.bitbucket.org/2.0/repositories/%s/%s/commit/%s?fields=date',
              $this->owner,
              $this->repository,
              $identifier
          );
          $commit = JsonFile::parseJson($this->getContentsWithOAuthCredentials($resource), $resource);
  
          return new \DateTime($commit['date']);
      }
docs: {@inheritdoc}