Even though the clock is past midnight, and the calendar date has moved forward by one day, humans will often mentally still feel like they are on the previous calendar day.
After all, no animal’s brain is built with innate calendar time awareness. We only see the sun rise and fall, and sleep and wake, and that’s how the brain really feels days.
A calendar date passing doesn’t “feel” like anything, it may happen and you won’t even notice it.