category: Base requires: sdesc: "Time Zone Database" ldesc: "The Time Zone Database (often called tz, tzdb, or zoneinfo) contains data that represents the history of local time for many locations around the world, and supports conversion of UTC time to local time at those locations to allow display of those local times. It is updated periodically to reflect changes made by political bodies to daylight saving (summer time) rules, UTC offsets, and time zone boundaries."