To update the active date ranges of promo codes:
In the main settings cogwheel, select Reservations -> Promo Codes.
Select the Promo Code that needs to be modified.
In the Promo Code details screen, click on the Dates tab.
Enter in a start date and an end date range for when you'd like the Promo Code to be active.
If you'd like you can click on the purple plus icon to add an additional date range, if applicable.
Be sure to save!
