Package: locales Version: 2.7-18 I am using the ru_UA locale. In calendar week is begining from Sunday but must from Monday like in ru_RU. I fixing this bug by this: 1. add in /usr/share/i18n/locales/ru_UA file lines in LC_TIME section first_weekday 2 first_workday 2 2. sudo dpkg-reconfigure locales 3. reboot I am using Debian GNU/Linux 5.0, but in older relizes this bug was too.