diff --git a/htdocs/core/modules/commande/mod_commande_marbre.php b/htdocs/core/modules/commande/mod_commande_marbre.php
index ddb1b689ddb..6bc537c7039 100644
--- a/htdocs/core/modules/commande/mod_commande_marbre.php
+++ b/htdocs/core/modules/commande/mod_commande_marbre.php
@@ -154,7 +154,7 @@ class mod_commande_marbre extends ModeleNumRefCommandes
 
 		//$date=time();
 		$date = $object->date;
-		$yymm = strftime("%y%m", $date);
+		$yymm = dol_print_date($date, "%y%m");
 
 		if ($max >= (pow(10, 4) - 1)) {
 			$num = $max + 1; // If counter > 9999, we do not format on 4 chars, we take number as it is