Thank you.

This is also what I find: NO DST in 1979,1980,1981,1982

Besides resmigazete, I have also started to search newspaper archives.

http://gazetearsivi.milliyet.com.tr (Milliyet) is free and searchable.
Even without speaking any Turkish, I can confirm:

The time change on 2 April 1978 (begin of DST) is announced on page 1 the day before.

There is no such time change announcement on a further date in 1978, 1979, 1980, 1981, 1982.
I have alaways checke the papers on the supposed data, and the day before. My search keyword is saat

I find the next time change announcement in the paper on 30 July 1983, for the change on 31 July 83, 2:00 am.

Hi! Here's some "resmi gazete" links for those years.

http://www.resmigazete.gov.tr/arsiv/14539.pdf (page 24)
1973-06-03 01:00 -> 02:00
1973-11-04 02:00 -> 01:00


http://www.resmigazete.gov.tr/arsiv/14829.pdf (page 1)
1974-03-31 02:00 -> 03:00
1974-11-03 02:00 -> 01:00


http://www.resmigazete.gov.tr/arsiv/15161.pdf (page 1)
1975-03-22 02:00 -> 03:00
1975-11-02 02:00 -> 01:00


http://www.resmigazete.gov.tr/arsiv/15535_1.pdf (page 1)
1976-03-21 02:00 -> 03:00
1976-10-31 02:00 -> 01:00


http://www.resmigazete.gov.tr/arsiv/15778.pdf (page 5)
1977-04-03 02:00 -> 03:00
1977-10-16 02:00 -> 01:00
1978-04-02 02:00 -> 03:00 (not applied, see below)
1978-10-15 02:00 -> 01:00 (not applied, see below)
1979-04-01 02:00 -> 03:00 (not applied, see below)
1979-10-14 02:00 -> 01:00 (not applied, see below)


http://www.resmigazete.gov.tr/arsiv/16245.pdf (page 17)
This cancels the previous decision, and repeats it only for 1978.
1978-04-02 02:00 -> 03:00
1978-10-15 02:00 -> 01:00 (not applied due to standard TZ change below)


http://www.resmigazete.gov.tr/arsiv/16331.pdf (page 3)
This decision changes the default longitude for Turkish time zone from 30 degrees East to 45 degrees East. This means a standard TZ change, from +2 to +3. This is published & applied on 1978-06-29. At that time, Turkey was already on summer time (already on 45E). Hence, this new law just meant an "continuous summer time". Note that this was reversed in a few years.


http://www.resmigazete.gov.tr/arsiv/18119_1.pdf (page 1)
1983-07-31 02:00 -> 03:00 (note that this jumps TZ to +4)
1983-10-02 02:00 -> 01:00 (back to +3)


http://www.resmigazete.gov.tr/arsiv/18561.pdf (page 1 and 34)
At this time, Turkey is still on +3 with no spring-forward on early 1984. This decision is published on 10/31/1984.
Page 1 declares the decision of reverting the "default longitude change". So the standard time should go back to +3 (30E).
And page 34 explains when that will happen:
1984-11-01 02:00 -> 01:00
You can think of this as "end of continuous summer time, change of standard time zone".


http://www.resmigazete.gov.tr/arsiv/18713.pdf (page 1)
1985-04-20 01:00 -> 02:00
1985-09-28 02:00 -> 01:00


From 1986 on, you can see my previous comments here: https://github.com/eggert/tz/blob/master/europe#L3671

Thanks,
Kivanc Yazan