As an online alternative to enh's option, https://nodatime.org/tzvalidate/generate can be used to generate a tzvalidate format <https://github.com/nodatime/tzvalidate/blob/main/format.md> report. The version can be specified as a query parameter, along with the zone, start year and end year. For example: https://nodatime.org/tzvalidate/generate?version=2025a&zone=Asia/Tehran&startYear=1976&endYear=1982 (I've extended the year range there just for clarity)
That generates: Asia/Tehran Initially: +03:30:00 standard +0330 1977-03-21 19:30:00Z +04:30:00 daylight +0430 1977-10-20 19:30:00Z +04:00:00 standard +04 1978-03-24 20:00:00Z +05:00:00 daylight +05 1978-08-04 20:00:00Z +04:00:00 standard +04 1978-12-31 20:00:00Z +03:30:00 standard +0330 1979-05-26 20:30:00Z +04:30:00 daylight +0430 1979-09-18 19:30:00Z +03:30:00 standard +0330 1980-03-20 20:30:00Z +04:30:00 daylight +0430 1980-09-22 19:30:00Z +03:30:00 standard +0330 (A quick scan suggests that's the same data as produced by zdump, which is certainly what I'd expect...) On Tue, 18 Mar 2025 at 11:13, Roozbeh Pournader via tz <tz@iana.org> wrote: > Can someone please kindly give me a dump of Asia/Tehran changes according > to the latest tzdata for the years 1977-1981? > > I'm trying to piece together the newspaper bits and pieces and compare > with the tz database, and it seems that there is clearly some transitions > missing. Specifically, I find the following lines confusing: > > 4:00 Iran %z 1979 > 3:30 Iran %z > > Does that mean we think Iran switched from UTC+4:00 to UTC+3:30 on Jan 1, > 1979? > > Thanks a lot, > Roozbeh > >
