tz database

The tz database is a collaborative compilation of information about the world's <a href="/facts/Time_zone/x5JzdlX8">time zones</a> and rules for observing <a href="/facts/Daylight_saving_time/bEWvB1Rt">daylight saving time</a>, 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 <a href="/facts/ICANN/2EHgcUU1">ICANN</a>. The tz database is also known as tzdata, the zoneinfo database or the IANA time zone database (after the <a href="/facts/Internet_Assigned_Numbers_Authority/b6MlP6zQ">Internet Assigned Numbers Authority</a>), and occasionally as the Olson database, referring to the founding contributor, Arthur David Olson.
Its uniform naming convention for entries in the database, such as America/New_York and Europe/Paris, was designed by Paul Eggert. The database attempts to record historical time zones and all civil changes since 1970, the <a href="/facts/Unix_time/d8Et1sa2">Unix time</a> epoch. It also records <a href="/facts/Leap_second/HQQ0X0hn">leap seconds</a>.
The database, as well as some reference <a href="/facts/Source_code/o9J6Jv23">source code</a>, is in the <a href="/facts/Public_domain/YWKMDKw4">public domain</a>. New editions of the database and code are published as changes warrant, usually several times per year.

tz database open-in-new

tz database