Anatolii Smolianinov <zarkonesmall@gmail.com> writes:
> Right, it is not an official standard, but TZDIR appears in tzselect, which
> comes from GNU libc. https://www.unix.com/man-page/redhat/8/TZSELECT/
No, it comes from the tzdb distribution, which otherwise hard-wires
a compile-time choice for that directory. Which is how come no other
program responds to that environment variable. So if anything, that's
precedent for our behavior.
regards, tom lane