This tab in the Time Zone Database Tool shows you the timezone.jar file version, and which “Olsen Time Zone DB” version the file is based upon. The “Min Year” says how far back historically time zones are guaranteed to behave correctly. Conversely, “Max Year” is how far forward behavior should be correct.

The main view is a tabbed breakdown of all time zone definitions by world region, where the list of time zones in each region is listed alphabetically.