I would be remiss if I didn’t wish you a happy birthday, even if I am one day late! Belated wishes to you!
Belated happy birthday to you! Sorry that I’m a little late to the party with these wishes!
I wanted to have sent this message on time, but better late than never! I wish you a belated happy birthday!
I know these birthday wishes are belated, but the fact I’m making up for being late means they’re packed...
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