I am very confused, my dearest anon, but Ubisoft’s official birthday for Connor is April 4. Did you get your information from this website?
(Frankly, I’ve always pegged Connor to be a Taurus than an Aries, so a May 8 birthdate is actually great to me, but if the Word of God™ has said that his birthday is April 4, then so shall it be.)
~ Signora Paola