[Bug libstdc++/114645] std::chrono::current_zone ignores $TZ on Linux

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114645

--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #16)
> I would expect TZ=:Europe/London to work according to POSIX,

Well, POSIX says ":characters" is implementation-defined, but for Glibc it
looks up an IANA zone.

I would also expect "<MST>7<MDT>" to work, since the current POSIX spec
describes that.