foo.cc: In constructor 'DateTime::DateTime()':
foo.cc:11:21: warning: unused variable 'y' [-Wunused-variable]
   11 |                 int y=2024,mon=3,d=19,h=0,min=38,s=30;
      |                     ^
foo.cc:11:28: warning: unused variable 'mon' [-Wunused-variable]
   11 |                 int y=2024,mon=3,d=19,h=0,min=38,s=30;
      |                            ^~~
foo.cc:11:34: warning: unused variable 'd' [-Wunused-variable]
   11 |                 int y=2024,mon=3,d=19,h=0,min=38,s=30;
      |                                  ^
foo.cc:11:39: warning: unused variable 'h' [-Wunused-variable]
   11 |                 int y=2024,mon=3,d=19,h=0,min=38,s=30;
      |                                       ^
foo.cc:11:43: warning: unused variable 'min' [-Wunused-variable]
   11 |                 int y=2024,mon=3,d=19,h=0,min=38,s=30;
      |                                           ^~~
foo.cc:11:50: warning: unused variable 's' [-Wunused-variable]
   11 |                 int y=2024,mon=3,d=19,h=0,min=38,s=30;
      |                                                  ^