mozna dodac kodzik w zaleznosci gdzie chcemy wyswietlac wyroznienie
np. w product.tpl
{if ($product->reduction_from == $product->reduction_to OR ($smarty.now|date_format:'%Y-%m-%d %H:%M:%S' <= $product->reduction_to && $smarty.now|date_format:'%Y-%m-%d %H:%M:%S' >= $product->reduction_from))}<img src="obrazek.png" style="position:absolute"/>{/if}