/in/foo.cc: In function 'int main()':
/in/foo.cc:52:12: error: 'additionalSeconds' was not declared in this scope; did you mean 'additionalSecond'?
   52 |     cin >> additionalSeconds;
      |            ^~~~~~~~~~~~~~~~~
      |            additionalSecond
/in/foo.cc:54:8: error: 'class Date' has no member named 'addSeconds'; did you mean 'addSecond'?
   54 |     dt.addSeconds(additionalSecond);
      |        ^~~~~~~~~~
      |        addSecond