Customize WordPress Upload Directory

Can’t test at the moment but I’d try rewriting the date to variable code from:

$time = current_time( 'mysql' );
$y = substr( $time, 0, 4 );
$m = substr( $time, 5, 2 );
$subdirectory = "/$y/$m";

To:

$y = date('Y');
$m = date('m');
$subdirectory = "https://wordpress.stackexchange.com/" . $y . "https://wordpress.stackexchange.com/" . $m;