He may just be quick at executing the Doomsday algorithm - neurotypical here, but I enjoyed learning this trick, and you can too: https://en.wikipedia.org/wiki/Doomsday_rule
He can also recite the US and UK release dates for most kids films (he learns them from Wikipedia)... and then he can subsequently tell you the day of the week!!
Most of his tricks are based on his amazing memory, he recites long sections from film and TV shows years after watching them.
That doesn't mean his brain haven't developed the same algorithm for it.
The brain is exceptional at noticing patterns. Some people's brains are very preoccupied with numbers, and abstract data. (Some people like spotting license plates, some can't even look away.)