public function resize($params) {
		//update the event
		$this->end_timestamp = $params['new_end_timestamp'];
		$this->end_date = $params['new_end_date'];
		$this->end_time = $params['new_end_time'];
		$this->end_delta = $params['new_end_timestamp'] - $this->getStartTimestamp(); // how long this is in seconds

		$this->repeat_end_timestamp = $this->calculateRepeatEndTimestamp();
		return true;
	}