So, the layout for birthdays on the new facebook isn't very clear. They have everyone whose birthday is coming up listed in a row in bright red print with the day of their birthday in light gray print next to their name. Today, I was looking there and just opened up everyone's profile who was in red and wished them a happy birthday. Seconds later, I realized that I was the first one to do so on many profiles. I looked back and realized that their birthdays weren't today, they were sometime in the next couple days. Oops.
I promptly deleted my comments. Now no one will know of my slip-ups except the people themselves (probably the worst people to know). That's okay, I'll just make sure to wish them happy birthday on their real birthday.