Locales for non-Gregorian calendars

[Florian Weimer]

* Avid Seeker via Libc-help:

> However, Unicode ICU4J include definitions for an extensive set of
> calendars: Islamic, Hebrew, Coptic, etc.
>
> https://unicode-org.github.io/icu-docs/apidoc/dev/icu4j/com/ibm/icu/util/Calendar.html
>
> What's the current progress on integrating that with glibc to have
> similar locale formats but for other dates? This is especially relevant
> since many countries don't have Gregorian as the official calendar, and
> so a big part of the locale is missing by not including the other
> calendars.

There are no plans to include this in glibc.  Applications should use
ICU instead.  Even our Gegorian calendar support is incomplete, we only
implement the proleptic Gergorian calendar.  It's also difficult to
switch localtime to calendars with more than 12 months or 31 calendar
days because that is likely to trigger out-of-bounds memory accesses in
applications.

Thanks,
Florian