/in/foo.cc:135:7: error: redefinition of 'class DateTime'
  135 | class DateTime
      |       ^~~~~~~~
/in/foo.cc:127:7: note: previous definition of 'class DateTime'
  127 | class DateTime
      |       ^~~~~~~~
/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:145:21: error: redeclaration of 'int m'
  145 |         int y,m,d,h,m,s,second;
      |                     ^
/in/foo.cc:145:15: note: 'int m' previously declared here
  145 |         int y,m,d,h,m,s,second;
      |               ^
/in/foo.cc:148:18: error: conflicting declaration 'DateTime d'
  148 |         DateTime d(y,m,d,h,m,s);
      |                  ^
/in/foo.cc:145:17: note: previous declaration as 'int d'
  145 |         int y,m,d,h,m,s,second;
      |                 ^
/in/foo.cc:149:9: error: 't' was not declared in this scope
  149 |         t.Add(second);
      |         ^