Comment 1 for bug 318507

There is http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=327025 about a similar behaviour some years ago, but it has been closed for quite a long time.

This may be a regression on libc6, or a locale issue, not sure. Assigning to GLIBC, marking as confirmed.

to test:

hggdh@xango2:~/libpst $ env LC_ALL=C cal
    January 2009
Sa Su Mo Tu We Th Fr
                1 2
 3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31
hggdh@xango2:~/libpst $ env LC_ALL=en_US.UTF8 cal
    January 2009
Su Mo Tu We Th Fr Sa
             1 2 3
 4 5 6 7 8 9 10
11 12 13 14 15 16 17