Hello, thanks for reply!

There is only one time zone in Ukraine right now - Europe/Kiev (law https://zakon.rada.gov.ua/laws/show/509-96-п paragraph 1, use Google Translate). As for the others (Europe/Uzhgorod and Europe/Zaporozhye), I could not find any information of them in the past. But maybe I was looking badly, historical documents are harder to look for.

If possible, please mark these zones as inactive (if we assume that the information in them is correct) or delete them (because they are useless and nobody uses them). The main problem is that many third-party software offers these zones to choose from. What is wrong because these zones do not exist now.

PS: I am a citizen of Ukraine, so you can ask specific questions, I will try to find answers to them. Unfortunately, I could not find Shanks's International Atlas, therefore, I can’t verify the accuracy of the data.

пн, 2 дек. 2019 г. в 21:31, Paul Eggert <eggert@cs.ucla.edu>:

On 11/26/19 6:04 AM, Mikhail Gribanov wrote:

>> Europe/Uzhgorod
>> Europe/Zaporozhye
>>
>> Can you explain why they were added? I did not find any evidence of
>> the existence of events "Ruthenia used CET 1990/1991" (comment in tz
>> database).

As I recall, they were added because Shanks's International Atlas had
them. The "europe" file says:

# Unless otherwise specified, the source for data through 1990 is:
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th
edition),
# San Diego: ACS Publications, Inc. (2003).
# Unfortunately this book contains many errors and cites no sources.

It's quite possible that Shanks was wrong, or that I transcribed Shanks
incorrectly. If so, it'd be helpful to provide evidence of the error, so
that we can fix tzdb.