BirthdaySort::processLogic

protected function processLogic(Item $item, Context $context = null): Result
{
	if ($item->hasField(Item::FIELD_NAME_BIRTHDATE))
	{
		$birthDate = $item->get(Item::FIELD_NAME_BIRTHDATE);

		if (empty($birthDate))
		{
			$birthDate = '';
		}

		$item->set($this->getName(), BirthdayReminder::prepareSorting($birthDate));
	}

	return new Result();
}