PVS-Studio warning V576 for WebRTC

int32_t TraceWindows::AddDateTimeInfo(char* trace_message) const
{
  ....
  TCHAR sz_date_str[20];
  TCHAR sz_time_str[20];
  ....
  sprintf(trace_message,
          "Local Date: %s Local Time: %s",
          sz_date_str,
          sz_time_str);
  ....
}

This suspicious code was found in WebRTC project by PVS-Studio static code analyzer.
Warning message is:
V576 Incorrect format. Consider checking the third actual argument of the 'sprintf' function. The pointer to string of char type symbols is expected. trace_win.cc 112

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/