def get_result_group_names(self, request_datetime):
        """Only today/yesterday/last interval are valid datetime"""
        request_date = request_datetime.date()
        today = datetime.date.today()
        yesterday = datetime.date.today() - datetime.timedelta(days=1)
        result = []
        if total_seconds(datetime.datetime.now() - request_datetime) < REALTIME_UPDATE_INTERVAL:
            result.append('last_interval')
        if request_date == today:
            result.append(today.isoformat())
        elif request_date == yesterday:
            result.append(yesterday.isoformat())
        return result
Only today/yesterday/last interval are valid datetime