Collaborative compilation of information about the world's time zones
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d of the List of tz database time zones with OpenStreetMap data, using open source software.[1]
The tz database is a collaborative compilation of information about the world's time zones and rules for observing daylight saving time, primarily intended for use with computer programs and operating systems.[2] Paul Eggert has been its editor and maintainer since 2005,[3] with the organizational backing of ICANN.[4] The tz database is also known as tzdata, the zoneinfo database or the IANA time zone database (after the Internet Assigned Numbers Authority), and occasionally as the Olson database, referring to the founding contributor, Arthur David Olson.[5]
Its uniform naming convention for entries in the database, such as America/New_York and Europe/Paris, was designed by Paul Eggert.[6] The database attempts to record historical time zones and all civil changes since 1970, the Unix time epoch.[7] It also records leap seconds.[8]
The database, as well as some reference source code, is in the public domain.[9] New editions of the database and code are published as changes warrant, usually several times per year.[10]
^Siroky, Evan (1 January 2024). "Time Zone Boundary Builder".
^Eggert, Paul; Olson, Arthur David. "Time zone and daylight saving time data".
^Eggert, Paul (17 January 2005). "Re: FW: IANA time zone registration – proposal". tz (Mailing list).
^Cite error: The named reference :0 was invoked but never defined (see the help page).
^Olson, Arthur David (16 December 1986). "Resolved timezone issue? Other issues. New ctime manual page". tz (Mailing list).
^Eggert, Paul (20 October 1993). "proposal for time zone names". tz (Mailing list).
^Olson, Arthur David (18 March 1987). "Re: List of issues". tz (Mailing list).
^Devine, Bob (2 June 1988). "leap seconds; [0-60] is ok". tz (Mailing list).
^Eggert, Paul (11 November 1995). "questions and comments on http://tycho.usno.navy.mil/tzones.html". tz (Mailing list).
^"zoneinfo tzcode and tzdata archives (FTP)". Retrieved 30 October 2007.
The tzdatabase is a collaborative compilation of information about the world's time zones and rules for observing daylight saving time, primarily intended...
This is a list of time zones from release 2024a of the tzdatabase. Canonical - The primary, preferred zone name. Link - An alternative name (alias) which...
geographic region which uses a common clock time Tzdatabase, also called zoneinfo or IANA Time Zone Database, a compilation of information about the world's...
summer it had the same clock time as Spokane and northern Idaho. The tzdatabase version 2024a contains two time zones for Idaho: Prerau, David (2006)...
Department of Transportation as well as the United States Congress. The tzdatabase version 2024a contains two time zones for Florida. "Florida House of...
49–1–10. It was approved by Governor Jack Williams the same day. The tzdatabase version 2024a contains two entries for Arizona: When daylight saving...
zone identifier from the zone file of the tzdatabase. The reference point was Ulan-Ude. It was added in tz version 2011e. Edition 2011i did not contain...
UTC offsets List of time zone abbreviations – abbreviations List of tzdatabase time zones – zones used by many computer systems as defined by IANA List...
assumed despite the limited presence of clocks. The file zone.tab of the tzdatabase contains the following zones, columns marked with * contain data from...
(Alaska Time and Hawaii–Aleutian Time) until November 30, 1984. The tzdatabase version 2024a contains seven time zones for Alaska for historical reasons...
TimeAndDate.com. Retrieved 24 April 2021. Europe (2020 edition) at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. Current...
April 2, 2006, all counties in Indiana observe daylight saving time. The tzdatabase lists 11 time zones for Indiana, where each zone is defined as a geographic...
tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. Olson, Arthur David (22 April 2016). "[tz] Time zone selection". tz database...
Standardization. Retrieved 21 May 2021. (Paywalled) Europe (2020 edition) at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. Current...
2022. "Africa". tzdatabase. Internet Assigned Numbers Authority. Retrieved 7 August 2022. Olson, Arthur David (22 April 2016). "[tz] Time zone selection"...
Unix epoch, which is the date from which the tzdatabase wants to record correct information. The database aims to include at least one zone for every...
Serbia. Lonely Planet. Retrieved 3 May 2021. Europe (2020 edition) at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. Current...
hr (in Croatian). Retrieved 2 May 2021. Europe (2020 edition) at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. Current...
TimeAndDate.com. Retrieved 2 May 2021. Europe (2020 edition) at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. German:...
Government Printing Office. p. 3. Retrieved 15 September 2021. Africa at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 15 September 2021...
Smalltalk does not support time zones at all. For full support of the tzdatabase (zoneinfo) in a Smalltalk application (including support for any number...
Romania. Lonely Planet. Retrieved 6 May 2021. Europe (2020 edition) at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. Current...
Germany. The zone Europe/Busingen was created in the 2013a release of the tzdatabase, because since the Unix time epoch in 1970, Büsingen has shared clocks...
Intelligence Agency (CIA). Retrieved 3 May 2021. Europe (2020 edition) at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. Current...
(in Slovak). SME. Retrieved 5 July 2021. Europe (2020 edition) at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 20 May 2021. Current...
(No. 21 of 1956), 29 August 1956. Retrieved 7 July 2021. Africa at the tzdatabase. Internet Assigned Numbers Authority (IANA). Retrieved 7 July 2021. Current...
the tzdatabase also known as zoneinfo. The tzdatabase maps a name to the named location's historical and predicted clock shifts. This database is used...
the original on 18 October 2009. Retrieved 17 October 2023. tzdatabase – The tzdatabase contains an extensive history of time zone and daylight saving...
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