The tz database, also called tzdata, the zoneinfo database or IANA (Internet Assigned Numbers Authority) time zone database, is a collaborative compilation of information about the world's time zones, primarily intended for use with computer programs and operating systems. It is sometimes called the Olson database, referring to the founding contributor, Arthur David Olson. Paul Eggert is currently its editor and maintainer.

AmigaOS now has its own version with full support for all time zones. So far only Classic Amiga OS is supported but support for at least AROS is planned. Hyperions AmigaOS 4 might already support this database. I haven't been able to find any information on the topic. Read more about the database at Wikipedia or IANA. The primary usage is to keep your Amiga clock synced regardless changes in summer and winter time. Other application might also benefit from the database, f.x. network time synchronization software. The software also include small tools, one of them being able to show the time in other parts of the world.

To get the most out of The Time Zone Database a RTC module is required. Are you a developer or maybe just a curious Amiga user, then you can download The Amiga Timezone Database from aminet.