User blog comment:Kittyfire/Ferb Fletcher Day/@comment-1758900-20100321184107

That's interesting. I'd vote February 13th February (the month the show OFFICIALLY premiered) 13th (Ferb's home country is Great Britain. G is the 7th letter of the alphabet, and B is the 2nd. Since there is no such day as February 72nd, I add those two numbers together to get 9!. Now, since P&F premiered on a leap year, add 4 to get 13!)