Hi, I initialize time input facet in such way: new boost::posix_time::time_input_facet( std::string("%Y-%m-%d %H:%M: %S") ) and valgrind --track-origins=yes tells me: ==30317== Conditional jump or move depends on uninitialised value(s) ... ==30317== Uninitialised value was created by a stack allocation ==30317== at 0x806C486: std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > boost::date_time::gather_weekday_strings<char>(std::locale const&, bool) (strings_from_facet.hpp:84) Is there way to fix the problem? The problem is located within boost according to valgrind, but I assume that it can be produced by incorrect usage. Thanks gcc 4.4.1 boost 1.39.0