Re: [tz] Turkey Rules 1978 - 1983 may need revision

Alois Treindl wrote:

This source http://www.astrolojidergisi.com/yazsaati.htm has researched the time zone history of Turkey, based on newspaper archives and official documents.

Thanks for the pointer to Oya Vulaş's table. It cites and reproduces quite a few good sources, so I adjusted tzdb's timestamps to match its timestamps for the period 1940/1985 and installed the attached proposed patch into the development version on GitHub. Vulaş does not cover the period before 1940 so we'll stick to Shanks's dicier data for that. For 1986 on, Vulaş agrees with the official sources we already cite. I think this resolves the issue "Turkey Rules late 70's - October 1978 bug?" that you mentioned a bit earlier.