Dmitry, Shotwell is known to not work with dates before 1969 - see http://trac.yorba.org/ticket/3040 . I think that's probably the cause of the sorting problems you're seeing.
** Bug watch added: trac.yorba.org/ #3040 http://trac.yorba.org/ticket/3040 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/665602 Title: Incorrect sorting of photos -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs