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      sub bycreatetime
      {
             return $nodes{$a}{createtime}
...
      {
            # ...
      }

      my (%sort_method) = (
            createtime => \&bycreatetime,
            createuser => \&bycreateuser, # For example
...
      {
            # ...
      }

      sub NumericalSort
      {
            my ($field) = @_;
...
      {
            # ...
      }