ZoneInfo is an app for iOS, iPadOS, and macOS to view the time zones in the system’s time zone database.

The app reads from /usr/share/zoneinfo/ which is discussed in

Each entry in the file contains the identifier for a time zone and the coordinate of the exemplar location for that time zone.

ZoneInfo places each entry on a map as a pin- selecting a pin shows details about the time zone. Each pin is colored by its offset from GMT so that the user may visualize regions that observe the same local time.


ZoneInfo on macOS

ZoneInfo on iOS with only the map visible ZoneInfo on iOS with the detail panel open


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