So you never know when you're birthday is going to be each year? [That actually sounds kind of exciting! To have a surprise birthday every year.]

Something special? [It makes him think of when he met the silver haired girl. That day was more special to him than anyone will ever know but unfortunately he doesn't know that exact date, and he never will. He lived in his world for fifteen years without any idea of what the dates were as they went by. All he knows is that it was at the end of the summer when he met her that night.]

What if I don't know the actual date but... guess based on the season? Would that be okay?