system/HTTP/DownloadResponse.php
public function setDate(\DateTime $date)
	{
		$date->setTimezone(new \DateTimeZone('UTC'));

		$this->setHeader('Date', $date->format('D, d M Y H:i:s') . ' GMT');

		return $this;
	}
public function setDate(\DateTime $date)
	{
		$date->setTimezone(new \DateTimeZone('UTC'));

		$this->setHeader('Date', $date->format('D, d M Y H:i:s') . ' GMT');

		return $this;
	}
{@inheritDoc}