Events on the list view screen
For all day events, we consider it another day once time passes midnight. For example, at 6:00pm (18:00) on Christmas Eve, we would say it is 1 day or sleep until Christmas Day, even though it is technically only 6 hours until 25 December 2022, 12:00am (00:00).
This logic seems to matches how Siri and other apps operate.
Event view screen with full screen countdown
Tapping on an event will show the event full screen, where we show the exact number of days, hours, minutes and seconds until the event. So for the example above, it would say 0 days, 6 hours, etc until Christmas Day.