@goaserer I think the file is: https://github.com/eggert/tz/blob/main/backwardIt can be an interesting solution, I did not know the double timezone for Kyiv. Surely to evaluate in the future. @kirjoittaessani pointed out an interesting case for keeping Busingen:"It can -- at least theoretically -- still be relevant: if you calculate time differences involving a date that falls inside the period where time differed from the rest of Germany, the result wouldn't be correct." Cit.
