tzdata¹, used by glibc and others, does exactly this. And most of the
linux and bsd -based dists have unbundled it from the libc packages to
make it easier to keep up to date. (As an example, in Gentoo it is
called sys-libs/timezone-data.)
That sounds like exactly the right thing for the Emacs calendar to
consult. (Thanks.) But this should wait for after the release.
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