20.10.2016 3:26, Paul Eggert пишет:
On 10/19/2016 03:40 AM, Karel Volný wrote:

the problem is, as far as _other_ people are concerned, they find the classical abbreviations useful


Not many people object to truly classical abbreviations like GMT and EST; it's our inventions like LKT that are more problematic.

I believe vitually everyone in Russia able to read Latin could understand what YAKT means

Hmm, well, I just now did a Google search for "YAKT site:ru" and the first match was for a Russian-language description of Yakt, Montana (and I've visited near Yakt and it's beautiful country - but it's not Yakutsk).

Did you try to do similar search with other abbreviations? 

For example, i found (in 'europe'): AMT - it marked as 'invented', none of the first  20 matches time zone abbreviation, but it still in database. When it will be removed?

I have just tried: 

Australia: AWDT, AWST, LINT, MHT, KOST, NRT
Asia: SGT, AST, XJT
North America: HDT, HST (America/Adak), AKDT, AKST (America/Nome), HST (Zone Pacific/Honolulu)

None of 50 first matches for these searches are not about time (skip timezone converter sites, they are based on tzdata).
I think, the same can be said about _any_ abbreviation.

For HDT even timezoneconverter sites are not in search results.

Did you still find google search is reasonable instrument to detect if abbreviation is widely-used?

None of the first ten matches were about Yakutsk time. With more-specialized searches one can find instances of "YAKT" to mean Yakutsk time, largely because of the tzdata invention in earlier releases. But it's more common for English-language sources to call it "Yakutsk time" with no abbreviation; or when abbreviations are used, to say something like "UTC+9" or "MSK+6".

The same can be said about _any_ abbreviation.


it is very bad that the change was done in a way that it applies even for older timestamps

The tzdata time zone abbreviations are proleptic. That is, they are the English-language abbreviations we use *now* for old time stamps, and these abbreviations may differ from abbreviations used back then (often because hardly anybody used abbreviations back then). It might be nice to also support contemporaneous abbreviations, or abbreviations based on tzdata release number, but that would be a harder task and I will be happy to let some other project take it on if there is interest.

Then just remove abbreviations completely. But you somehow think that they are important to some people and unimportant to others.

-- 
Regards,