code: protected String getFormatName(String format, long time)
    {
      if (time <= 0) {
        time = CurrentTime.currentTime();
      }
      
      if (true) throw new UnsupportedOperationException();
  
      /*
      if (format != null)
        return QDate.formatLocal(time, format);
      else if (_rolloverCron != null)
        return _rolloverPrefix + "." + QDate.formatLocal(time, "%Y%m%d.%H");
      else if (getRolloverPeriod() % (24 * 3600 * 1000L) == 0)
        return _rolloverPrefix + "." + QDate.formatLocal(time, "%Y%m%d");
      else
        return _rolloverPrefix + "." + QDate.formatLocal(time, "%Y%m%d.%H");
        */
      
      return _rolloverPrefix + ".date";
    }
docs: Returns the name of the archived file
  
  @param time the archive date