code: public PhotoList<Photo> recentlyUpdated(Date minDate, Set<String> extras, int perPage, int page) throws FlickrException {
          Map<String, Object> parameters = new HashMap<String, Object>();
          parameters.put("method", METHOD_RECENTLY_UPDATED);
  
          parameters.put("min_date", Long.toString(minDate.getTime() / 1000L));
  
          if (extras != null && !extras.isEmpty()) {
              parameters.put("extras", StringUtilities.join(extras, ","));
          }
          if (perPage > 0) {
              parameters.put("per_page", Integer.toString(perPage));
          }
          if (page > 0) {
              parameters.put("page", Integer.toString(page));
          }
  
          Response response = transport.get(transport.getPath(), parameters, apiKey, sharedSecret);
          if (response.isError()) {
              throw new FlickrException(response.getErrorCode(), response.getErrorMessage());
          }
          Element photosElement = response.getPayload();
          PhotoList<Photo> photos = PhotoUtils.createPhotoList(photosElement);
          return photos;
      }
docs: Return a list of your photos that have been recently created or which have been recently modified. Recently modified may mean that the photo's metadata
  (title, description, tags) may have been changed or a comment has been added (or just modified somehow :-)
  
  This method requires authentication with 'read' permission.
  
  @see com.flickr4java.flickr.photos.Extras
  @param minDate
  Date indicating the date from which modifications should be compared. Must be given.
  @param extras
  A set of Strings controlling the extra information to fetch for each returned record. Currently supported fields are: license, date_upload,
  date_taken, owner_name, icon_server, original_format, last_update, geo. Set to null or an empty set to not specify any extras.
  @param perPage
  Number of photos to return per page. If this argument is 0, it defaults to 100. The maximum allowed value is 500.
  @param page
  The page of results to return. If this argument is 0, it defaults to 1.
  @return a list of photos
  @throws FlickrException