Originally I had a calendar that displayed Saturday as the first day of the week, then switching from no locale set to LC_ALL="en_US" the first day became Monday -- in both cases it should have been Sunday. Here is the locale data: LC_ALL="" locale -k -c LC_TIME LC_TIME abday="Sun
you can find similar reports against Ubuntu: https://launchpad.net/distros/ubuntu/+source/langpack-locales/+bug/31814/ and Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=347323
*** This bug has been marked as a duplicate of 2371 ***