Do HBO GO PROMO have expiration dates? September 26, 2018 13:16 Updated Yes, an HBO GO PROMO has an expiration date and restrictions may apply. Related articles Is there a limit to how many HBO GO PROMO codes I can buy? How to register with a HBO GO PROMO? What is the HBO GO PROMO? How do I get the HBO GO app? When will I be charged after the free trial period?