Package: ncal Version: 12.1.7+nmu3 Severity: normal Dear Maintainer,
ncal lists incorrect week numbers when using the -w option. Week numbers do not conform in the ISO-8601 standard, even though the man page states that the "-w" option is ISO-8601 compliant. For example, when producing a calendar for today (2021-09-24): $ ncal -w ncal outputs the following: September 2021 Su 5 12 19 26 Mo 6 13 20 27 Tu 7 14 21 28 We 1 8 15 22 29 Th 2 9 16 23 30 Fr 3 10 17 24 Sa 4 11 18 25 36 37 38 39 40 Which incorrectly lists today's week number as "39" when the correct ISO-8601 week number for 2021-09-24 is W38. The correct week number can be verified using the date command: $ date -d "2021-09-24" +%W 38 This seems to be caused by ncal miscounting the first week for the year: $ ncal -b -w 2021 2021 January February March w| Su Mo Tu We Th Fr Sa w| Su Mo Tu We Th Fr Sa w| Su Mo Tu We Th Fr Sa 1| 1 2 6| 1 2 3 4 5 6 10| 1 2 3 4 5 6 2| 3 4 5 6 7 8 9 7| 7 8 9 10 11 12 13 11| 7 8 9 10 11 12 13 3| 10 11 12 13 14 15 16 8| 14 15 16 17 18 19 20 12| 14 15 16 17 18 19 20 4| 17 18 19 20 21 22 23 9| 21 22 23 24 25 26 27 13| 21 22 23 24 25 26 27 5| 24 25 26 27 28 29 30 10| 28 14| 28 29 30 31 6| 31 April May June w| Su Mo Tu We Th Fr Sa w| Su Mo Tu We Th Fr Sa w| Su Mo Tu We Th Fr Sa 14| 1 2 3 18| 1 23| 1 2 3 4 5 15| 4 5 6 7 8 9 10 19| 2 3 4 5 6 7 8 24| 6 7 8 9 10 11 12 16| 11 12 13 14 15 16 17 20| 9 10 11 12 13 14 15 25| 13 14 15 16 17 18 19 17| 18 19 20 21 22 23 24 21| 16 17 18 19 20 21 22 26| 20 21 22 23 24 25 26 18| 25 26 27 28 29 30 22| 23 24 25 26 27 28 29 27| 27 28 29 30 23| 30 31 July August September w| Su Mo Tu We Th Fr Sa w| Su Mo Tu We Th Fr Sa w| Su Mo Tu We Th Fr Sa 27| 1 2 3 32| 1 2 3 4 5 6 7 36| 1 2 3 4 28| 4 5 6 7 8 9 10 33| 8 9 10 11 12 13 14 37| 5 6 7 8 9 10 11 29| 11 12 13 14 15 16 17 34| 15 16 17 18 19 20 21 38| 12 13 14 15 16 17 18 30| 18 19 20 21 22 23 24 35| 22 23 24 25 26 27 28 39| 19 20 21 22 23 24 25 31| 25 26 27 28 29 30 31 36| 29 30 31 40| 26 27 28 29 30 October November December w| Su Mo Tu We Th Fr Sa w| Su Mo Tu We Th Fr Sa w| Su Mo Tu We Th Fr Sa 40| 1 2 45| 1 2 3 4 5 6 49| 1 2 3 4 41| 3 4 5 6 7 8 9 46| 7 8 9 10 11 12 13 50| 5 6 7 8 9 10 11 42| 10 11 12 13 14 15 16 47| 14 15 16 17 18 19 20 51| 12 13 14 15 16 17 18 43| 17 18 19 20 21 22 23 48| 21 22 23 24 25 26 27 52| 19 20 21 22 23 24 25 44| 24 25 26 27 28 29 30 49| 28 29 30 1| 26 27 28 29 30 31 45| 31 The first week in January 2021 is incorrectly indicated as week "1". According to ISO-8601 the first week of the year is the week that contains that year's first Thursday. As such, the first week in January 2021 should be "0" and the week with the first Thursday should be "1". Thank you, Andrew -- System Information: Debian Release: 11.0 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 5.10.0-8-amd64 (SMP w/24 CPU threads) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages ncal depends on: ii libc6 2.31-13 ii libtinfo6 6.2+20201114-2 ncal recommends no packages. ncal suggests no packages. -- no debconf information