foo.cc: In function 'int main()':
foo.cc:54:25: warning: 'y' is used uninitialized in this function [-Wuninitialized]
   54 |  Datetime d1(y,m,d,h,f,s);
      |                         ^
foo.cc:54:25: warning: 'm' is used uninitialized in this function [-Wuninitialized]
foo.cc:54:25: warning: 'd' is used uninitialized in this function [-Wuninitialized]
foo.cc:54:25: warning: 'h' is used uninitialized in this function [-Wuninitialized]
foo.cc:54:25: warning: 'f' is used uninitialized in this function [-Wuninitialized]
foo.cc:54:25: warning: 's' is used uninitialized in this function [-Wuninitialized]

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