tz database - Wikipedia
https://en.wikipedia.org/wiki/Tz_database
OverviewData structureCoverageMaintenanceUnix-like systemsUsage and extensionsHistorySee alsoThe tz database is a collaborative compilation of information about the world's time zones, primarily intended for use with computer programs and operating systems. Paul Eggert has been its editor and maintainer since 2005, with the organizational backing of ICANN. The tz database is also known as tzdata, the zoneinfo database or the IANA time zone database (after the Internet Assigned Numbers Authority
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