AC-14431: Order items order_date wrong formatting

Author: wip44850

app/code/Magento/SalesGraphQl/Model/Formatter/Order.php

@@ -49,7 +49,7 @@ public function format(OrderInterface $orderModel): array
             'increment_id' => $orderModel->getIncrementId(),
             'number' => $orderModel->getIncrementId(),
             'order_date' => $this->timezone->date($orderModel->getCreatedAt())
-                ->format('d/m/Y H:i:s'),
+                ->format(DateTime::DATETIME_SLASH_PHP_FORMAT),
             'order_number' => $orderModel->getIncrementId(),
             'status' => $orderModel->getStatusLabel(),
             'email' => $orderModel->getCustomerEmail(),

app/code/Magento/SalesGraphQl/Model/Resolver/CreditMemo/CreditMemoComments.php

@@ -53,7 +53,7 @@ public function resolve(
                 $comments[] = [
                     'message' => $comment->getComment(),
                     'timestamp' => $this->timezone->date($comment->getCreatedAt())
-                        ->format(DateTime::DATETIME_PHP_FORMAT)
+                        ->format(DateTime::DATETIME_SLASH_PHP_FORMAT)
                 ];
             }
         }

app/code/Magento/SalesGraphQl/Model/Resolver/Invoices.php

@@ -74,7 +74,7 @@ private function getInvoiceComments(InvoiceInterface $invoice): array
             if ($comment->getIsVisibleOnFront()) {
                 $comments[] = [
                     'timestamp' => $this->timezone->date($comment->getCreatedAt())
-                        ->format(DateTime::DATETIME_PHP_FORMAT),
+                        ->format(DateTime::DATETIME_SLASH_PHP_FORMAT),
                     'message' => $comment->getComment()
                 ];
             }

app/code/Magento/SalesGraphQl/Model/Resolver/Shipments.php

@@ -75,7 +75,7 @@ private function getShipmentComments(ShipmentInterface $shipment): array
             if ($comment->getIsVisibleOnFront()) {
                 $comments[] = [
                     'timestamp' => $this->timezone->date($comment->getCreatedAt())
-                        ->format(DateTime::DATETIME_PHP_FORMAT),
+                        ->format(DateTime::DATETIME_SLASH_PHP_FORMAT),
                     'message' => $comment->getComment()
                 ];
             }

dev/tests/api-functional/testsuite/Magento/GraphQl/Sales/RetrieveOrdersByOrderNumberTest.php

@@ -11,6 +11,7 @@
 use Magento\Framework\Api\SearchCriteriaBuilder;
 use Magento\Framework\Exception\AuthenticationException;
 use Magento\Framework\Registry;
+use Magento\Framework\Stdlib\DateTime;
 use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
 use Magento\GraphQl\GetCustomerAuthenticationHeader;
 use Magento\Sales\Api\OrderRepositoryInterface;
@@ -508,7 +509,7 @@ public function testGetCustomerDescendingSortedOrders()
         for ($i = 1; $i <= 3; $i++) {
             $orderNumber = $this->fixtures->get('or' . $i)->getIncrementId();
             $orderCreatedAt = $this->timezone->date($this->fixtures->get('or' . $i)->getCreatedAt())
-                ->format('d/m/Y H:i:s');
+                ->format(DateTime::DATETIME_SLASH_PHP_FORMAT);
             $orderNumberCreatedAtExpected[$orderNumber] = $orderCreatedAt;
         }
 

lib/internal/Magento/Framework/Stdlib/DateTime.php

@@ -25,6 +25,8 @@ class DateTime
 
     public const DATE_PHP_FORMAT = 'Y-m-d';
 
+    public const DATETIME_SLASH_PHP_FORMAT = 'd/m/Y H:i:s';
+
     /**#@-*/
 
     /**