code: func extractDayHour(format string) (int64, int64, int64, gotime.Duration, error) {
  	fields := strings.Split(format, " ")
  	if len(fields) != 2 {
  		return 0, 0, 0, 0, errors.Errorf("invalid time format - %s", format)
  	}
  
  	days, err := strconv.ParseInt(fields[0], 10, 64)
  	if err != nil {
  		return 0, 0, 0, 0, errors.Errorf("invalid time format - %s", format)
  	}
  
  	hours, err := strconv.ParseInt(fields[1], 10, 64)
  	if err != nil {
  		return 0, 0, 0, 0, errors.Errorf("invalid time format - %s", format)
  	}
  
  	return 0, 0, days, gotime.Duration(hours) * gotime.Hour, nil
  }
docs: // Format is `DD HH`.