/in/foo.cc: In function 'std::string dateToString(const Date&)':
/in/foo.cc:35:11: error: 'setw' was not declared in this scope; did you mean 'getw'?
   35 |     ss << setw(2) << setfill('0') << date.month << "/"
      |           ^~~~
      |           getw
/in/foo.cc:35:22: error: 'setfill' was not declared in this scope
   35 |     ss << setw(2) << setfill('0') << date.month << "/"
      |                      ^~~~~~~