The date for whatever reason is no longer displayed.
This changed a couple of program updates for whatever madness provoked this decision.
A lot was said about it not being required given you don't need to register or renew the FREE version, but that is total bull droppings.
Every year like clockwork (or any hiccup like yours) you get reminders to renew, etc. etc. which if anything is hoping the user might opt for the paid Avast Premium version.