such a mapping cannot be perfect because the number of time zones in Windows systems is significantly lower than in the IANA TZ database. History The project's origins go back to 1986 or earlier. 2011 lawsuit On 30 September 2011, a lawsuit, Astrolabe, Inc. v. Olson et al., was filed concerning copyright in the database. As a result, on 6 October 2011, the database's mailing list and FTP site were shut down. The case revolved around the database maintainers' use of The American Atlas, by Thomas G. Shanks, and The International Atlas, by Thomas G. Shanks and Rique Pottenger. It complained of unauthorised reproduction of atlas data in the timezone mailing list archive and in some auxiliary link collections maintained with the database, though it did not actually point at the database itself. The complaint related only to the compilation of historical timezone data, and did not cover current tzdata world timezone tables. This lawsuit was resolved on 22 February 2012 after the involvement of the Electronic Frontier Foundation, when Astrolabe voluntarily moved to dismiss the lawsuit without having ever served the defendants and agreed to a covenant not to sue in the future. Move to ICANN ICANN took responsibility for the maintenance of the database on 14 October 2011. The full database and a description of current and future plans for its maintenance are available online from IANA. See also List of tz database time zones Time zone Daylight saving time References External links General . (deprecated, see Official IANA sources below) . . tz mailing list at ICANN "A literary appreciation of the Olson/Zoneinfo/tz database" by Jon Udell Official IANA sources Home page FTP rsync, at rsync://rsync.iana.org/tz/ Man pages (gives the syntax of source files for the tz database) (gives the format of compiled tz database files)