Hi, in MSVC 8.0 _UNICODE build, after I send a ptime to wcout, I can no longer print "international" characters. When I use a temporary wostringstream for printing the ptime, everything is OK. Minimal repro see below (the "2" at the end is never printed). With some characters like the "š" in the example, the output is totally cut off; with others, like "á", the codepage is changed, so the characters are displayed incorrectly. Any suggestions? Thanks, Filip // _UNICODE must be defined; the "2" is never printed. #include <string> #include <iostream> #include <sstream> #include <locale.h> #include <boost/date_time/posix_time/posix_time.hpp> using boost::posix_time::ptime; using boost::date_time::not_a_date_time; int main() { wstring intl=L"\x161"; wostringstream ss; ss << ptime(not_a_date_time); wcout << ss.str() << endl; wcout << intl << endl; wcout << L"1" << endl; wcout << ptime(not_a_date_time) << endl; wcout << intl << endl; wcout << L"2" << endl; }