Even if `ncal: setlocale: No such file or directory` is about my
system not having "en_US" generated and falling back to LANG=C, I just
can't find a place showing week 1 of 2019 being 6th-12th January 2019
for US.
f.ex:
https://www.timeanddate.com/calendar/custom.html?year=2019=1=1=1=1
Seems to be affected by `$LANG` (or derivative) as for example this
gives correct week number:
$ LANG=C ncal -w 01 2019
January 2019
Su 6 13 20 27
Mo 7 14 21 28
Tu 1 8 15 22 29
We 2 9 16 23 30
Th 3 10 17 24 31
Fr 4 11 18 25
Sa 5 12 19 26
1 2 3 4 5
$ echo $LANG
Package: bsdmainutils
Version: 11.1.2+b1
Severity: important
Dear Maintainer,
according to ISO8601:
"the first calendar week of a calendar year is the week including the first
Thursday of that year"
Running `ncal -w 01 2019` yields
```
January 2019
Su 6 13 20 27
Mo 7 14
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