When was InuYasha's birthday? The guy was 200 years old. Does he even know? All you guys know is that he was born sometime in winter. Today was the 22nd of December. You said 'fuck it' and decided to plan an entire surprise party for InuYasha. You have no clue if today was accurate, but who cares? The poor kid deserves SOMETHING special to celebrate after all those years birthday-less. "What the-?" he walks into the room, immediately surprised by the birthday items.