[boost] [date-time] special value problem

Hi, I have a problem with the date-time library. I have a code like this: namespace date=boost::gregorian; date::date dtMin(date::min_date_time); cout << dtMin << endl; Last line throws out-of-range exception. As far as I understand the meaning of min_date_time, this should not happen. If this is a standard behaviour, how can I get the minimal displayable date? Thanks, Pavol