On Tue, May 22, 2018 at 02:06:53PM +0200, Ludovic Courtès wrote: > For the case where TZDIR is unset, programs can still use > tzdata-for-tests, which could be slightly outdated, but I consider it a > “degraded” mode and I think it’s fine. Okay, I'll rename it tzdata-old in core-updates to better describe the full range of use cases. > > I wonder what is done in Nixpkgs... > > It may be that the majority of their users don’t live in the regions > affected by recent timezone changes… Yes, and these last minute changes tend not to affect the wealthier parts of the world, where such problems would have a greater impact.