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

2024a (Released 2024-02-01)
File Description
tzdb-2024a.tar.lz (525.6kb) Complete Distribution (Data, Code and Extras)
tzdata2024a.tar.gz (440.7kb) Data Only Distribution
tzcode2024a.tar.gz (294.5kb) Code Only Distribution

Mailing Lists

  • Announcements: A low-volume announcement mailing list used for announcing updates to the Time Zone Database.
  • Submissions and Discussion: 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.


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.