Changing Date Format on Custom Meta Data w/shortcode call

Try with change line to date('d-m-Y',strtotime($current_user->delivery_date)) ;

function delivery_date( $atts ) {
    global $current_user, $user_login;
    get_currentuserinfo();
    add_filter('widget_text', 'do_shortcode');
    if ($user_login) 
        return date('d-m-Y',strtotime($current_user->delivery_date)) ;

}
add_shortcode( 'delivery_date', 'delivery_date' );

echo do_shortcode('[delivery_date]');