The schedule determines the days of the week that the Deals page will present a product for sale based on the time zone.
The first step is to set the timezone to your timezone.
Next determine the days of the week you wish to offer a deal. The Deals page will always tell the user the next day that an offer will be presented. So, if you only activate Friday as the only day for deals, customers will be presented with the message "Check back on Friday" for everyday of the week except on Friday.