diff --git a/htdocs/core/modules/contract/doc/pdf_strato.modules.php b/htdocs/core/modules/contract/doc/pdf_strato.modules.php
index 69a4d5ce96e..67dca0ecf1b 100644
--- a/htdocs/core/modules/contract/doc/pdf_strato.modules.php
+++ b/htdocs/core/modules/contract/doc/pdf_strato.modules.php
@@ -321,28 +321,28 @@ class pdf_strato extends ModelePDFContract
 
 						// Description of product line
 
-						if ($objectligne->date_ouverture_prevue) {
-							$datei = dol_print_date($objectligne->date_ouverture_prevue, 'day', false, $outputlangs, true);
+						if (!empty($objectligne->date_start)) {
+							$datei = dol_print_date((int) $objectligne->date_start, 'day', false, $outputlangs, true);
 						} else {
 							$datei = $langs->trans("Unknown");
 						}
 
-						if ($objectligne->date_fin_validite) {
-							$durationi = convertSecondToTime($objectligne->date_fin_validite - $objectligne->date_ouverture_prevue, 'allwithouthour');
-							$datee = dol_print_date($objectligne->date_fin_validite, 'day', false, $outputlangs, true);
+						if (!empty($objectligne->date_end)) {
+							$durationi = convertSecondToTime((int) $objectligne->date_end - (int) $objectligne->date_start, 'allwithouthour');
+							$datee = dol_print_date($objectligne->date_end, 'day', false, $outputlangs, true);
 						} else {
 							$durationi = $langs->trans("Unknown");
 							$datee = $langs->trans("Unknown");
 						}
 
-						if ($objectligne->date_ouverture) {
-							$daters = dol_print_date($objectligne->date_ouverture, 'day', false, $outputlangs, true);
+						if (!empty($objectligne->date_start_real)) {
+							$daters = dol_print_date((int) $objectligne->date_start_real, 'day', false, $outputlangs, true);
 						} else {
 							$daters = $langs->trans("Unknown");
 						}
 
-						if ($objectligne->date_cloture) {
-							$datere = dol_print_date($objectligne->date_cloture, 'day', false, $outputlangs, true);
+						if (!empty($objectligne->date_end_real)) {
+							$datere = dol_print_date((int) $objectligne->date_end_real, 'day', false, $outputlangs, true);
 						} else {
 							$datere = $langs->trans("Unknown");
 						}
@@ -363,7 +363,7 @@ class pdf_strato extends ModelePDFContract
 						if (empty($conf->global->CONTRACT_HIDE_REAL_DATE_ON_PDF)) {
 							$txt .= '<br>';
 							$txt .= $outputlangs->transnoentities("DateStartRealShort")." : <strong>".$daters.'</strong>';
-							if ($objectligne->date_cloture) {
+							if (!empty($objectligne->date_end_real)) {
 								$txt .= " - ".$outputlangs->transnoentities("DateEndRealShort")." : '<strong>'".$datere.'</strong>';
 							}
 						}