Time Zone Database
The Time Zone Database (often called tz or zoneinfo) contains code and data that represent the history of local time for many representative locations around the globe. It is updated periodically to reflect changes made by political bodies to time zone boundaries, UTC offsets, and daylight-saving rules. Its management procedure is documented in BCP 175: Procedures for Maintaining the Time Zone Database.
Latest version
2021a (Released 2021-01-24)
tzdb-2021a.tar.lz (481.8kb)
Complete Distribution (Data, Code and Extras)
tzdata2021a.tar.gz (402.2kb)
Data Only Distribution
tzcode2021a.tar.gz (256.1kb)
Code Only Distribution
Mailing Lists
Announcements
A low-volume announcement mailing list used for announcing updates to the Time Zone Database.
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Submissions/Discussions
A higher volume discussion list used for discussing proposals for updates to the Database. Contributions to this list may be emailed to tz@iana.org.
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Distribution
We provide access to the Time Zone Database via three methods:
TZ Coordinator
The IESG-designated TZ Coordinators are Paul Eggert (primary) and Tim Parenti (secondary).
Further information
Further information on the Time Zone Database, including implementation details, is described in the code repository.
Domain Names
Number Resources
Protocols
Protocol RegistriesTime Zone Database
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