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