The Wayback Machine - https://web.archive.org/web/20111017173848/http://www.iana.org:80/time-zones

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.

Latest version

Time Zone Data v. 2011l (Released 10 October 2011) tzdata2011l.tar.gz (203kb)
Time Zone Code v. 2011i (Released 29 August 2011) tzcode2011i.tar.gz (135kb)

Mailing List

Edits to the Time Zone Database are discussed on a dedicated Time Zone mailing list. Contributions on information of revised time zones are welcome to be posted to this list.

Distribution

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

Database Coordinator

As an interim measure, updates to the database will be performed by ICANN as instructed by the Internet Engineering Steering Group (IESG). Long-term arrangements for management of the Time Zone Database are being finalised in the IETF. See draft-lear-iana-timezone-database for more information.

Further information

Further information on the Time Zone Database, including implementation details, is available at http://www.twinsun.com/tz/tz-link.htm.