The maximum time difference between any two points on Earth, ignoring daylight saving time, is 26 hours. This occurs between locations observing UTC−12:00 and those observing UTC+14:00.
The calculation is straightforward: the difference between −12 and +14 is 26 hours. This range exists because time zones are arranged around the International Date Line in the Pacific Ocean. The westernmost civil time zone is UTC−12:00, used by places such as Baker Island and Howland Island, while UTC+14:00 is used in parts of Kiribati, including the Line Islands.
This answer can seem surprising because the world is often described as having 24 hours of time zones. The 24-hour figure refers to Earth’s rotation and the idealized global cycle, not the full spread of modern civil clock settings. Political and economic decisions have shaped time-zone boundaries, allowing the displayed offsets to span 26 hours.
The difference is about local clock dates as well as hours. When it is Monday on one side, it can already be Tuesday on the other. Daylight saving time is excluded here because it changes seasonal clock readings rather than the standard offset range.