MAGETWO-95802: Admin date wrong formatting for French locale

- Changed the logic of date formatting

Author: nikshostko

dev/tests/integration/testsuite/Magento/Catalog/_files/products_new.php

@@ -15,8 +15,8 @@
     ->setStatus(\Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED)
     ->setWebsiteIds([1])
     ->setStockData(['qty' => 100, 'is_in_stock' => 1, 'manage_stock' => 1])
-    ->setNewsFromDate(date('Y-m-d', strtotime('-2 day')))
-    ->setNewsToDate(date('Y-m-d', strtotime('+2 day')))
+    ->setNewsFromDate(date('Y-m-d H:i:s', strtotime('-2 day')))
+    ->setNewsToDate(date('Y-m-d H:i:s', strtotime('+2 day')))
     ->setDescription('description')
     ->setShortDescription('short desc')
     ->save();