Hello, I am using the time_facet class to be able to output time and date (in millisecond precision) in some weird format someone cooked up. I have to generate a timestamp everytime I send something to another application. The following testprogram reproduces my error (using Visual Studio 2005): #include <iostream> #include <boost/date_time/posix_time/posix_time.hpp> using namespace boost::posix_time; using namespace std; void imbue_crash_test(time_facet* formatter, ptime outputTime ){ stringstream tempStream; tempStream.imbue(locale(cout.getloc(), formatter)); tempStream<<outputTime<<endl; cout<<tempStream.str(); } int main(){ time_facet* timeFormatter=new time_facet(); timeFormatter->format("%Y %m %d %H %M %S %f"); imbue_crash_test(timeFormatter, microsec_clock::universal_time()); imbue_crash_test(timeFormatter, microsec_clock::universal_time()); system("pause"); return 0; } which gives me an access violation while writing the "outputTime" to the stringstream the second time. When i stop the app and check the "formatter" instance i notice that the value of "m_time_duration_format" gives "<BadPtr>" probably indicating that the formatter has been deleted. Does anyone have a clue as to why this would be? The problem is resolved by making sure the stream is in the same scope as the time_facet instance, and thus making sure they are destroyed at the same time. Any idea why this is? Is this a bug, a feature, or am I being stupid again? Greetz, Mark