code: def date_created(self):
          
          date_created = self.xml.find('author-profile/date-created', ns)
          try:
              return (int(date_created.attrib['year']),
                      int(date_created.attrib['month']),
                      int(date_created.attrib['day']))
          except AttributeError:  # date_created is None
              return (None, None, None)
docs: Date the Scopus record was created.