Yeah, my reference to my son also being a walking calendar is about knowing every random date and its day for the past and future few years.
My DD cannot do this, which I do think of as a sort of savant ability. However, she remembers days of the week for significant events. Like, she might remember that she had music class on her 5th birthday (she is now 9), so it was a Wednesday. I find this amazing, but my own memory is terrible. She remembers other little details of this type. Also, the main subject that requires memorization in her present school is science. I have noticed that when she takes science quizzes with questions like, "What is evaporation?" she answers with the exact words she wrote down in her notebook during class. (She never studies for these tests.) It's just really easy for her to memorize stuff. Still, I don't think she really has a photographic memory, per se.
