public static function getDateTimeFromRfc($date) {

		// various date formats
		$formats = array(
				'RFC2822' => \DateTime::RFC2822,	// Fri, 06 Nov 2015 09:23:05 +0100
				'RFC2046' => 'D, d M Y H:i:s O T',	// Fri, 06 Nov 2015 09:23:05 +0100 (CET)
				'CUSTOM1' => 'D, j M Y H:i:s O',	// Fri, 6 Feb 2015 09:23:05 +0100
				'CUSTOM2' => 'd M Y H:i:s O',		// 06 Nov 2015 09:23:05 +0100
				'RSS2'    => 'D, d M Y H:i:s T');	// Tue, 10 May 2016 15:33:54 GMT
		
		// tries each date format
		foreach ($formats as $format) {

			$datetime = \DateTime::createFromFormat($format, $date, new \DateTimeZone(BASE_TIMEZONE));

			if (is_a($datetime, '\DateTime')) {
				return $datetime;
			}

		}

		return NULL;

	}