I forgot my friend's birthday yesterday. I want to send him a short message today. How can I send it?

1. Today, you can send a message to tell him that he forgot his birthday because he was busy yesterday, apologize first and then wish you a happy birthday. Such a simple answer is enough. There is no need to lie. After all, if you forget, just say it honestly and your friends will understand. After all, he may forget your birthday next time.

After you apologize, you'd better ask him out to dinner as compensation, which is more perfect. After all, you forgot to buy dinner now, and no one will complain any more.