What does JustPark class as a "day"?
JustPark "days" are not from midnight to the following midnight or a 24 hour period. JustPark "days' are calculated by a calendar day that resets at 5:00 AM. We do this to account for drivers who might be parking for evening events.
If your booking extends beyond 5:00 AM, you may be charged for any additional time spent, even if the booking spans less than 24 hours. This will depend on the rules within each carpark, you'll need to check on the description for this.
9.00 AM 1st January to 4.00 AM 2nd January = 1 day.
9.00 AM 1st January - 8.00 AM 2nd January = 1 day + 3 hours.