Re: calendar gets wrong end for Daylight Savings Time

[Richard Stallman]

    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.