Monthly export fix

includes/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Workbook.php

@@ -2,6 +2,9 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;
 
+require_once DOL_DOCUMENT_ROOT . '/includes/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/Date.php';
+
+
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\NamedRange;
 use PhpOffice\PhpSpreadsheet\Shared\Date;