Sale Date

Hi,

I am trying to find out if there is a way of setting a date range for sale items?

I see in other plugins this is available but I cannot seem to find anyway of doing this through wp-ecommerce.

So for example a product price of $100 sale price of $50, and this will revert back to $100 automatically after 21st september.

Thank you for your help in advance!

http://wordpress.org/plugins/wp-e-commerce/