def date_created(self):
        """Date the Scopus record was created."""
        date_created = self.xml.find('institution-profile/date-created')
        if date_created is not None:
            date_created = (int(date_created.attrib['year']),
                            int(date_created.attrib['month']),
                            int(date_created.attrib['day']))
        else:
            date_created = (None, None, None)
        return date_created