Hi, On 2021-12-15 16:02, Daniel McDonald wrote: > Package: glibc > Version: 2.31 > > Use of mktime with tm_isdst=1 results in -1 indicating an error. This appears > unexpected, and cannot be replicated on OS X 11.6.1, Centos 7.9, Fedora 35, > Alpine or RHEL 8. The issue was first observed on Github Actions > ubuntu-latest (20.04). > > This issue was originally opened on the CPython bug tracker. They advised > opening a bug report with both Ubuntu and Debian. The original report with > CPython can be found here: > > https://bugs.python.org/issue44413 > > An example C program follows at the end of the bug report, and can be > compiled with “gcc bug.c -o bug”. > > An example of execution of the bug, and failure, within a glibc 2.31 > environment can be found here: > > https://github.com/wasade/cpython/runs/4541212472?check_suite_focus=true#step:17:57 > > Thank you for your time. Please let me know if additional information would > be helpful. This is my first bug report to Debian. Though I reviewed the > guidance docs, I apologize in advance if I overlooked something. > -Daniel > > #include <time.h> > #include <stdio.h> > > void do_test() { > struct tm tm_works = { .tm_year=117, > .tm_mon=4, > .tm_mday=26, > .tm_hour=15, > .tm_min=30, > .tm_sec=16, > .tm_wday=4, > .tm_yday=145, > .tm_isdst=-1 };
In that structure, you define the DST to be unknown. It is therefore left to mktime to decide if the current timezone was using DST or not at that time. > struct tm tm_fails = { .tm_year=117, > .tm_mon=4, > .tm_mday=26, > .tm_hour=15, > .tm_min=30, > .tm_sec=16, > .tm_wday=4, > .tm_yday=145, > .tm_isdst=1 }; In that test, you specify that the DST was in effect. It is true for some timezones like America/New_York or Europe/Berlin, but it is not true for timezones like UTC or Japan/Tokyo. Therefore your test depends on your timezone. Could you please share your timezone configuration? Note that depending on the timezone I choose, I can make the test to work or fail on both Debian and Fedora. Regards, Aurelien -- Aurelien Jarno GPG: 4096R/1DDD8C9B aurel...@aurel32.net http://www.aurel32.net