Triggers loading of messages till a specific point in time

        :param last: Datetime object for the last message to be loaded
        :type last: datetime
        :return: Nothing
        :rtype: None

def load_earlier_messages_till(self, last):
        """
        Triggers loading of messages till a specific point in time

        :param last: Datetime object for the last message to be loaded
        :type last: datetime
        :return: Nothing
        :rtype: None
        """
        timestamp = time.mktime(last.timetuple())
        self.driver.wapi_functions.loadEarlierMessagesTillDate(self.id, timestamp)