def dump(data)
      return data unless @jsonize
      convert_time(data)
      str = @serializer.serialize(data)
      str << "\n" if @with_newline
      str
    end
def dump(data)
      return data unless @jsonize
      convert_time(data)
      str = @serializer.serialize(data)
      str << "\n" if @with_newline
      str
    end
requires convert_time(data) method