is::getStartDateOrCreatedDate

private function getStartDateOrCreatedDate($flag = true)
{
	if (
		$flag
		&& empty($this->data['START_DATE_PLAN'])
		&& !empty($this->data['CREATED_DATE'])
	)
	{
		$date = $this->data['CREATED_DATE'];
	}
	else
	{
		$date = ($this->data['START_DATE_PLAN'] ?? null);
	}

	return $date;
}