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

2019b (Released 2019-07-01)
File Description
tzdb-2019b.tar.lz (457.9kb) Complete Distribution (Data, Code and Extras)
tzdata2019b.tar.gz (375.7kb) Data Only Distribution
tzcode2019b.tar.gz (245.3kb) Code Only Distribution

Mailing Lists

A low-volume announcement mailing list used for announcing updates to the Time Zone Database.
Subscribe/Unsubscribe Archive
A higher volume discussion list used for discussing proposals for updates to the Database. Contributions to this list may be emailed to [email protected].
Subscribe/Unsubscribe Archive


We provide access to the Time Zone Database via three methods:

TZ Coordinator

The IESG-designated TZ Coordinator is Paul Eggert.

Further information

Further information on the Time Zone Database, including implementation details, is described in the code repository.