diff --git a/classes/pdf/HTMLTemplateOrderSlip.php b/classes/pdf/HTMLTemplateOrderSlip.php
index e84725f57..db9df275d 100644
--- a/classes/pdf/HTMLTemplateOrderSlip.php
+++ b/classes/pdf/HTMLTemplateOrderSlip.php
@@ -45,7 +45,7 @@ class HTMLTemplateOrderSlipCore extends HTMLTemplateInvoice
 		$this->smarty = $smarty;
 
 		// header informations
-		$this->date = Tools::displayDate($this->order_slip->date_add, (int)$this->order->id_lang);
+		$this->date = Tools::displayDate($this->order_slip->date_add);
 		$this->title = HTMLTemplateOrderSlip::l('Slip #').Configuration::get('PS_CREDIT_SLIP_PREFIX', Context::getContext()->language->id).sprintf('%06d', (int)$this->order_slip->id);
 
 		// footer informations
diff --git a/classes/pdf/HTMLTemplateSupplyOrderForm.php b/classes/pdf/HTMLTemplateSupplyOrderForm.php
index 16a94b8e5..15139644d 100644
--- a/classes/pdf/HTMLTemplateSupplyOrderForm.php
+++ b/classes/pdf/HTMLTemplateSupplyOrderForm.php
@@ -45,7 +45,7 @@ class HTMLTemplateSupplyOrderFormCore extends HTMLTemplate
 		$this->address_supplier = new Address(Address::getAddressIdBySupplierId((int)$supply_order->id_supplier));
 
 		// header informations
-		$this->date = Tools::displayDate($supply_order->date_add, (int)$this->supply_order->id_lang);
+		$this->date = Tools::displayDate($supply_order->date_add);
 		$this->title = HTMLTemplateSupplyOrderForm::l('Supply order form');
 	}