nothing

add_shortcode('timer', 'cart_page_shipping_timer', 10);
function cart_page_shipping_timer() {
    // Change timezone if needed
    date_default_timezone_set( 'Europe/Sofia' );  
    
    global $product;

    $isInStock = $product->get_stock_quantity() > 0;

    var_dump($product->get_stock_quantity());
    
    echo '<pre>';
    
    var_dump($product);

    $order_by = "днес";

    if ( date( 'N' ) >= 5 ) {
        // if FRI/SAT/SUN delivery will be MON
        $del_day = date( "във вторник", strtotime( "next tuesday" ));

    } elseif ( date( 'H' ) >= 13) {
        // if MON/THU after 4PM delivery will be day after tomorrow
        $del_day = date("на d-m-yг.", strtotime("tomorrow + 1 day" ) );
        $order_by = "утре";

    } else {
        // if MON/THU before 4PM delivery will be TOMORROW
        $del_day = date( " утре ", strtotime( "tomorrow" ) );
    }

    //Change text if needed
    $html = "<br><div class='massagess21' style='clear:bot; font-weight: 600; text-align: center;'>Поръчай сега и ще получиш {$del_day}</div>";
    echo $html;
}