You may want to offer discount codes on your MyOrderDesk website to give buyers a flat or percentage discount. Creating discounts is quite simple, you will need to navigate to the order discounts section under the shopping cart.
Once there you will want to click add new discount
Discount Name: An internal name which allows for tracking.
Discount Code: The code your customer will need to know/enter.
Date Range: The date range the discount code will be available for use.
Discount Type: How to discount the order and the value of that discount.
Discount Order Minimum: The cart needs to be above this amount to use this code.
Auto-Lock Job: This is useful for preventing changes that could affect the price of the job after payment/submission.
Make this discount available at checkout: This will enable the use of the discount code site-wide.
Once the date expires you will not need to disable it, as the discount will only work for that date range.