I need advice (forgotten b-day)

So like, my friend had birthday on July 24 and like... I completely forgot. I remembered just now... Do you have any idea what to give him and how to apologize???? I'm a shitty friend, I know, but dates just go over my head, even important ones. I feel bad about it but idk how to apologize for it. Should I ask them to hang out and just give them a gift or just don't do anything? They aren't mad or petty, we're still good and there's no tension, so I'm not sure what to do. ☹️ So yeah. If you have any advice, pls send it my way!!!