Hi
You have access to the following variables within a Product detail or Product list module:
PHP Code:
$s->coupon_info($product, 'code');
$s->coupon_info($product, 'begin');
$s->coupon_info($product, 'end');
$s->coupon_info($product, 'restrictions');
Those are coupon code, coupon begin date, coupon end date and any coupon restrictions.
You can use those values in your own PHP conditionals.
Eric