Great design from Apple on this interaction with Siri. It was a bit after midnight (which was technically October 21), but since it was so close to the previous day, Siri wanted me to clarify which “tomorrow” 9am I really meant… 9am on the 21st (which was technically wrong, but it was what I wanted), or 9am on the 22nd (which would have been technically correct but not what I wanted).