Today's The Day! Yes, according to the 1976 DC Comics Calendar, today is Aquaman's birthday! Happy Birthday Arthur!
Is this date still valid in the New 52? Who knows? Maybe DC needs to put out a New 52 calendar in 2014 to make it clear!
Also: Amazingly, today is also the birthday of Steve Skeates, who wrote so many classic Aquaman stories! So it's Happy Birthday to Aquaman and Steve!