The Time Zone Database (often called tz
) 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
2021a (Released 2021-01-24)
Complete Distribution (Data, Code and Extras)
Data Only Distribution
Code Only Distribution
A low-volume announcement mailing list used for announcing updates to the Time Zone Database.
A higher volume discussion list used for discussing proposals for updates to the Database. Contributions to this list may be emailed to firstname.lastname@example.org
We provide access to the Time Zone Database via three methods:
The IESG-designated TZ Coordinators are Paul Eggert (primary) and Tim Parenti (secondary).