[libcxx-commits] [libcxx] [libc++][chrono] Adds the sys_info class. (PR #85619)

[Michał Górny via libcxx-commits]

mgorny wrote:

Hm, even more interesting. On my Gentoo system, amd64, glibc 2.39, tzdata 2024a:

```
$ zdump -v Antarctica/Syowa
Antarctica/Syowa  -9223372036854775808 (gmtime failed) = -9223372036854775808 (localtime failed)
Antarctica/Syowa  -67768040609752013 (gmtime failed) = -67768040609752013 (localtime failed)
Antarctica/Syowa  -67768040609752012 (gmtime failed) = Thu Jan  1 00:00:00 -2147481748 LMT isdst=0 gmtoff=11212
Antarctica/Syowa  -67768040609740801 (gmtime failed) = Thu Jan  1 03:06:51 -2147481748 LMT isdst=0 gmtoff=11212
Antarctica/Syowa  Thu Jan  1 00:00:00 -2147481748 UT = Thu Jan  1 03:06:52 -2147481748 LMT isdst=0 gmtoff=11212
Antarctica/Syowa  Thu Mar 13 20:53:07 1947 UT = Thu Mar 13 23:59:59 1947 LMT isdst=0 gmtoff=11212
Antarctica/Syowa  Thu Mar 13 20:53:08 1947 UT = Thu Mar 13 23:53:08 1947 +03 isdst=0 gmtoff=10800
Antarctica/Syowa  Wed Dec 31 20:59:59 2147485547 UT = Wed Dec 31 23:59:59 2147485547 +03 isdst=0 gmtoff=10800
Antarctica/Syowa  Wed Dec 31 21:00:00 2147485547 UT = 67768036191666000 (localtime failed)
Antarctica/Syowa  Wed Dec 31 23:59:59 2147485547 UT = 67768036191676799 (localtime failed)
Antarctica/Syowa  67768036191676800 (gmtime failed) = 67768036191676800 (localtime failed)
Antarctica/Syowa  9223372036854775807 (gmtime failed) = 9223372036854775807 (localtime failed)
```

https://github.com/llvm/llvm-project/pull/85619