code: private String toReleaseDateTimeString() {
  
      LocalDateTime releaseDateTime = getReleaseDateTime();
  
      return (releaseDateTime == null ? StringUtils.EMPTY_STRING
        : String.format(" on %s", releaseDateTime.format(DateTimeFormatter.ofPattern(RELEASE_DATE_TIME_FORMAT))));
    }
docs: Returns a {@link String} containing the release date and time for this {@link Version}.
  
  @return a {@link String} containing the software release date and time for this {@link Version},
  or an empty {@link String} if the software release date and time is unknown.