def _datetime_object_to_rfc_date_str(datetime_obj):
    ' Returns a date string to the RFC 3339 standard '
    return datetime_obj.strftime(_RFC3339_DATE_FORMAT)
Returns a date string to the RFC 3339 standard
def _datetime_object_to_rfc_date_str(datetime_obj):
    '  '
    return datetime_obj.strftime(_RFC3339_DATE_FORMAT)