Ah, sorry, it seems I was wrong about the C locale. I just cannot make
out how it counts weeks. Comments in usr.bin/ncal/calendar.c suggest
that it uses ISO definition, except when exactly 3 days of the first
week are in the preceding year -- in this case it would use the locale
value. Still, I get strange results with en_US.UTF-8, e.g:
$ LC_ALL=en_US.UTF-8 ncal -wd 2011-01
January 2011
Su 2 9 16 23 30
Mo 3 10 17 24 31
Tu 4 11 18 25
We 5 12 19 26
Th 6 13 20 27
Fr 7 14 21 28
Sa 1 8 15 22 29
1 2 3 4 5 6
