code: def get_timer_event_definition(self, timerEventDefinition):
          
          timeDate = first(self.xpath('.//bpmn:timeDate'))
          return TimerEventDefinition(
              self.node.get('name', timeDate.text),
              self.parser.parse_condition(
                  timeDate.text, None, None, None, None, self))
docs: Parse the timerEventDefinition node and return an instance of
          TimerEventDefinition
  
          This currently only supports the timeDate node for specifying an expiry
          time for the timer.