How to Add a Dynamic Copyright Date in Enfold socket

Hi everyone, I tried to insert in my functions.php this code

function year_shortcode() {
	$year = date('Y');
	return $year;
}
add_shortcode('year', 'year_shortcode');

and I add following shortcode in Enfold theme options > Footer > Copyright field
[year]
but it doesn’t work.
what appears is [year]
I give a moderator the administrator credentials to understand the reason and eventually solve it.
Thanks in advance