core-bundle/src/Resources/contao/library/Contao/Feed.php
protected function adjustPublicationDate()
	{
		if (!empty($this->arrItems) && $this->arrItems[0]->published > $this->published)
		{
			$this->published = $this->arrItems[0]->published;
		}
	}
protected function adjustPublicationDate()
	{
		if (!empty($this->arrItems) && $this->arrItems[0]->published > $this->published)
		{
			$this->published = $this->arrItems[0]->published;
		}
	}
Adjust the publication date