[Backport 2.2] Translate order getCreatedAtFormatted() to store locale

app/code/Magento/Sales/Model/Order.php

@@ -7,6 +7,8 @@
 
 use Magento\Directory\Model\Currency;
 use Magento\Framework\Api\AttributeValueFactory;
+use Magento\Framework\App\ObjectManager;
+use Magento\Framework\Locale\ResolverInterface;
 use Magento\Framework\Pricing\PriceCurrencyInterface;
 use Magento\Sales\Api\Data\OrderInterface;
 use Magento\Sales\Api\Data\OrderStatusHistoryInterface;
@@ -267,6 +269,11 @@ class Order extends AbstractModel implements EntityInterface, OrderInterface
      */
     protected $timezone;
 
+    /**
+     * @var ResolverInterface
+     */
+    private $localeResolver;
+
     /**
      * @param \Magento\Framework\Model\Context $context
      * @param \Magento\Framework\Registry $registry
@@ -295,7 +302,9 @@ class Order extends AbstractModel implements EntityInterface, OrderInterface
      * @param \Magento\Framework\Model\ResourceModel\AbstractResource $resource
      * @param \Magento\Framework\Data\Collection\AbstractDb $resourceCollection
      * @param array $data
+     * @param ResolverInterface $localeResolver
      * @SuppressWarnings(PHPMD.ExcessiveParameterList)
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
     public function __construct(
         \Magento\Framework\Model\Context $context,
@@ -324,7 +333,8 @@ public function __construct(
         \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $productListFactory,
         \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
         \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
-        array $data = []
+        array $data = [],
+        ResolverInterface $localeResolver = null
     ) {
         $this->_storeManager = $storeManager;
         $this->_orderConfig = $orderConfig;
@@ -335,7 +345,6 @@ public function __construct(
         $this->_productVisibility = $productVisibility;
         $this->invoiceManagement = $invoiceManagement;
         $this->_currencyFactory = $currencyFactory;
-        $this->_eavConfig = $eavConfig;
         $this->_orderHistoryFactory = $orderHistoryFactory;
         $this->_addressCollectionFactory = $addressCollectionFactory;
         $this->_paymentCollectionFactory = $paymentCollectionFactory;
@@ -346,6 +355,8 @@ public function __construct(
         $this->_trackCollectionFactory = $trackCollectionFactory;
         $this->salesOrderCollectionFactory = $salesOrderCollectionFactory;
         $this->priceCurrency = $priceCurrency;
+        $this->localeResolver = $localeResolver ?: ObjectManager::getInstance()->get(ResolverInterface::class);
+
         parent::__construct(
             $context,
             $registry,
@@ -1830,7 +1841,7 @@ public function getCreatedAtFormatted($format)
             new \DateTime($this->getCreatedAt()),
             $format,
             $format,
-            null,
+            $this->localeResolver->getDefaultLocale(),
             $this->timezone->getConfigTimezone('store', $this->getStore())
         );
     }

app/code/Magento/Sales/Test/Unit/Model/OrderTest.php

@@ -7,6 +7,8 @@
 
 use Magento\Catalog\Api\Data\ProductInterface;
 use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory as ProductCollectionFactory;
+use Magento\Framework\Locale\ResolverInterface;
+use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
 use Magento\Sales\Api\Data\OrderInterface;
 use Magento\Sales\Model\Order;
 use Magento\Sales\Model\ResourceModel\Order\Status\History\CollectionFactory as HistoryCollectionFactory;
@@ -73,6 +75,16 @@ class OrderTest extends \PHPUnit\Framework\TestCase
      */
     protected $productCollectionFactoryMock;
 
+    /**
+     * @var ResolverInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
+    private $localeResolver;
+
+    /**
+     * @var TimezoneInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
+    private $timezone;
+
     protected function setUp()
     {
         $helper = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
@@ -124,6 +136,8 @@ protected function setUp()
             true,
             ['round']
         );
+        $this->localeResolver = $this->createMock(ResolverInterface::class);
+        $this->timezone = $this->createMock(TimezoneInterface::class);
         $this->incrementId = '#00000001';
         $this->eventManager = $this->createMock(\Magento\Framework\Event\Manager::class);
         $context = $this->createPartialMock(\Magento\Framework\Model\Context::class, ['getEventDispatcher']);
@@ -138,7 +152,9 @@ protected function setUp()
                 'historyCollectionFactory' => $this->historyCollectionFactoryMock,
                 'salesOrderCollectionFactory' => $this->salesOrderCollectionFactoryMock,
                 'priceCurrency' => $this->priceCurrency,
-                'productListFactory' => $this->productCollectionFactoryMock
+                'productListFactory' => $this->productCollectionFactoryMock,
+                'localeResolver' => $this->localeResolver,
+                'timezone' => $this->timezone,
             ]
         );
     }
@@ -1044,6 +1060,22 @@ public function testResetOrderWillResetPayment()
         );
     }
 
+    public function testGetCreatedAtFormattedUsesCorrectLocale()
+    {
+        $localeCode = 'nl_NL';
+
+        $this->localeResolver->expects($this->once())->method('getDefaultLocale')->willReturn($localeCode);
+        $this->timezone->expects($this->once())->method('formatDateTime')
+            ->with(
+                $this->anything(),
+                $this->anything(),
+                $this->anything(),
+                $localeCode
+            );
+
+        $this->order->getCreatedAtFormatted(\IntlDateFormatter::SHORT);
+    }
+
     public function notInvoicingStatesProvider()
     {
         return [