                         columns: [
                                    {
                                        alignment: 'left',
                                        text: ['Creation date: ', {text: moment().format('MM-DD-YYYY (HH:mm:ss)')}]
                                    },
                                    {
                                        alignment: 'right',
                                        text: ['page ', {text: page.toString()}, ' de ', {text: pages.toString()}]
           