def setDates(photo,date_posted=nil,date_taken=nil,
date_taken_granularity=nil)
photo = photo.id if photo.class == Flickr::Photo
date_posted = date_posted.to_i if date_posted.class == Time
date_taken = @flickr.mysql_datetime(date_taken) if
date_taken.class == Time
args = {'photo_id' => photo}
args['date_posted'] = date_posted if date_posted
args['date_taken'] = date_taken if date_taken
args['date_taken_granularity'] = date_taken_granularity if
date_taken_granularity
@flickr.call_method('flickr.photos.setDates',args)
end