View Compilation Error

0_0_21287859_389.cpp: In function 'std::istream& operator>>(std::istream&, Time&)':
0_0_21287859_389.cpp:35:55: error: 'sscanf_s' was not declared in this scope
  sscanf_s(timestr.c_str(), "%d:%d", &t.hour, &t.minute);
                                                       ^