Get the online date from the meta creation date.

def get_online_date(self, **kwargs):
        """Get the online date from the meta creation date."""
        qualifier = kwargs.get('qualifier', '')
        content = kwargs.get('content', '')
        # Handle meta-creation-date element.
        if qualifier == 'metadataCreationDate':
            date_match = META_CREATION_DATE_REGEX.match(content)
            (year, month, day) = date_match.groups('')
            # Create the date.
            creation_date = datetime.date(int(year), int(month), int(day))
            return '%s/%s/%s' % (
                format_date_string(creation_date.month),
                format_date_string(creation_date.day),
                creation_date.year,
            )
        return None