foo.cc: In member function 'void Datetime::timeadd(int)':
foo.cc:19:23: warning: unused variable 'dm' [-Wunused-variable]
   19 |    int sf=0,fh=0,hd=0,dm=0,my=0;
      |                       ^~
foo.cc:19:28: warning: unused variable 'my' [-Wunused-variable]
   19 |    int sf=0,fh=0,hd=0,dm=0,my=0;
      |                            ^~

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