code: public Stats getPhotostreamStats(Date date) throws FlickrException {
          return getStats(METHOD_GET_PHOTOSTREAM_STATS, null, null, date);
      }
docs: Get the number of views, comments and favorites on a photostream for a given date.
  
  @param date
  (Required) Stats will be returned for this date. A day according to Flickr Stats starts at midnight GMT for all users, and timestamps will
  automatically be rounded down to the start of the day.
  @see "http://www.flickr.com/services/api/flickr.stats.getPhotostreamStats.htm"