Clarification: Turkey has been on "permanent" DST since March 2016, and a reintroduction of winter time this October is probably not happening. On 2017-09-27 16:07, Even Scharning wrote:

The ruling says that the board of ministers was not authorized to make a permanent decision about keeping DST. So I think we can expect a temporary decision to keep DST for another year.

Another source (in Turkish): https://www.cnnturk.com/ekonomi/turkiye/son-dakika-yaz-saati-uygulamasi-icin...

Time in Turkey: https://time.is/Turkey https://saatkac.info.tr/

Even Scharning Time.is - exact time for any time zone https://time.is/

On 2017-09-27 15:51, Dempsey, Peter wrote:

...

Hi,

Just to inform you about the breaking news in Turkey with regards to DST: http://www.sozcu.com.tr/2017/ekonomi/son-dakika-haberi-yaz-saati-uygulamasi-...

The Council of State have annulled the law that resulted in Turkey in no longer using DST. It is still not certain what the next actions that the Government will take but I will keep you informed accordingly.

Best regards,

Pete

PETE DEMPSEY

APPLICATION ENGINEER | Verint Customer Engagement Solutions

EMAIL PETER.DEMPSEY@VERINT.COM OFFICE +90-216-687-0822 MOBILE +90-532-581-5995

This electronic message may contain proprietary and confidential information of Verint Systems Inc., its affiliates and/or subsidiaries. The information is intended to be for the use of the individual(s) or entity(ies) named above. If you are not the intended recipient (or authorized to receive this e-mail for the intended recipient), you may not use, copy, disclose or distribute to anyone this message or any information contained in this message. If you have received this electronic message in error, please notify us by replying to this e-mail.

Thanks for keeping us up to speed with Turkish politics. In related news Serdar Denktas, the minister of finance for the Turkish part of Cyprus, has said they'll stay in sync with Turkey, ignoring complaints from the teachers' association (two pupils and a bus driver were killed last year while going to school in the dark). See: North to follow Turkey on winter time. Cyprus Mail 2017-09-11. http://cyprus-mail.com/2017/09/11/north-follow-turkey-winter-time/ Because of all this I guess that no change will be needed to tzdb.