code: def load_earlier_messages_till(self, last):
          
          timestamp = time.mktime(last.timetuple())
          self.driver.wapi_functions.loadEarlierMessagesTillDate(self.id, timestamp)
docs: 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