Note: /usr/bin/date is not affected, so it is probably not strftime()s
fault:
$ date --date=2021-01-01 +%V
53
$ date --date=2021-01-04 +%V
01
(Same with LC_TIME=de_DE.UTF-8, as below.)
- Roland
On Tue, Dec 01, 2020 at 10:51:05AM +0100, Roland Hieber wrote:
> Package: ncal
> Version: 12.1.7
> Severity: important
>
> Dear Maintainer,
>
> it seems that the output for week numbers for 2021 is incorrect:
>
> $ LC_TIME=de_DE.UTF-8 ncal -w3
> November 2020 Dezember 2020 Januar 2021
> Mo 2 9 16 23 30 7 14 21 28 4 11 18 25
> Di 3 10 17 24 1 8 15 22 29 5 12 19 26
> Mi 4 11 18 25 2 9 16 23 30 6 13 20 27
> Do 5 12 19 26 3 10 17 24 31 7 14 21 28
> Fr 6 13 20 27 4 11 18 25 1 8 15 22 29
> Sa 7 14 21 28 5 12 19 26 2 9 16 23 30
> So 1 8 15 22 29 6 13 20 27 3 10 17 24 31
> 44 45 46 47 48 49 49 50 51 52 1 1 2 3 4 5
>
> Here January 2021 starts with week 1 on Friday, the 1st of January.
>
> The manpage for ncal(1) mentions:
>
> STANDARDS
> [...]
> The week number computed by -w is compliant with the ISO 8601
> specification.
>
> ISO 8601 computes the week number depending on the year in which
> Thursday occurs, so 2020 should end on a Thursday with week 53.
>
> The same call on a system with bsdmainutils 11.1.2+b1 displays the
> correct week numbers, with week 53 spanning over the two years, and
> week 1 starting with 2021-01-04.
>
> - Roland
>
>
> -- System Information:
> Debian Release: bullseye/sid
> APT prefers testing
> APT policy: (990, 'testing'), (500, 'unstable-debug'), (500,
> 'testing-debug'), (500, 'unstable'), (1, 'experimental')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
>
> Kernel: Linux 5.6.0-2-amd64 (SMP w/4 CPU threads)
> Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
> Locale: LANG=en_US.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8),
> LANGUAGE=en_US:en
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
>
> Versions of packages ncal depends on:
> ii libc6 2.31-3
> ii libtinfo6 6.2+20200918-1
>
> ncal recommends no packages.
>
> ncal suggests no packages.
>
> -- no debconf information
