/in/foo.cc: In member function 'int Date::Monthday()':
/in/foo.cc:72:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if (m == 2)
   ^~
/in/foo.cc:74:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
    return 31;}
    ^~~~~~
/in/foo.cc: In member function 'int DateTime::Sub(DateTime&)':
/in/foo.cc:121:19: warning: 'delta' may be used uninitialized in this function [-Wmaybe-uninitialized]
   return delta1 + delta2;
                   ^~~~~~