Make the data year in the template dynamic by using date().

themes/example/defaults.php

@@ -90,7 +90,7 @@ class OC_Theme {
 	 * @return string short footer
 	 */
 	public function getShortFooter() {
-		$footer = '© 2018 <a href="'.$this->getBaseUrl().'" target="_blank\">'.$this->getEntity().'</a>'.
+		$footer = '© ' . date('Y') . ' <a href="'.$this->getBaseUrl().'" target="_blank\">'.$this->getEntity().'</a>'.
 			'<br/>' . $this->getSlogan();
 
 		return $footer;