code: def set_last_modified(self, dest_path, time_stamp, dry_run):
          
          # Translate time from RFC 1123 to seconds since epoch format
          secs = util.parse_time_string(time_stamp)
          if not dry_run:
              os.utime(self._file_path, (secs, secs))
          return True
docs: Set last modified time for destPath to timeStamp on epoch-format