The claim that Turkey had double daylight time in 1940/41 as was published in http://www.astrolojidergisi.com/yazsaati.htm has now been retracted. I had insisted on a double check, because the wording in official documents is often unclear and ambiguous.
Von: Barış İlhan <barisilhan@superonline.com> Datum: 15. August 2019 um 12:30:13 MESZ An: "'Alois Treindl'" <alois@astro.ch> Betreff: Aw: Turkey timezone change October 1978
Dear Alois,
I got in touch with the researcher, she said she made a correction for 1941 for one day, after she searched the newspapers. She came to the conclution that a sentence was written wrong in the official legal gazette. So the final list is this for 1941;
01.07.1940 saat 00.00
06.10.1940 saat 00.00 1 hour 01.12.1940 saat 00.00 - 21.09.1941 saat 00.00 1 hour 01.04.1942 saat 00.00 08.10.1945 saat 00.00
1 hour
The Milliye gazete archive will not be helpful, because that newspaper was founded in 1950.
Best, Baris
From: Alois Treindl [mailto:alois@astro.ch] Sent: Thursday, August 15, 2019 12:15 PM To: Barış İlhan <barisilhan@superonline.com> Subject: Re: Turkey timezone change October 1978
On 14.08.19 23:30, Barış İlhan wrote: It looks complicated but actually it is clear. In 1941 the government first announced 1 hour, and the next day 1 hour more. At the second announcement it says first announcement is still valid, so it makes 2 hours.
Best, Baris
Sorry, but we need to see this reports in public newspapers, both at the beginning and at the end of the period in question
Newspapers do say things like 'clock shifts backward one hour' at the end of daylight saving time. In that case, around 21 September 1941, the newspapers must have mentioned a clock shift by two hours.
The paper archive http://gazetearsivi.milliyet.com.tr/ is accessible for free and is searchable. My problem is that I cannot read Turkish.
We do not trust the wording of formal government announcements. They have been unclear at other occasions, for example in 1978.