MAGETWO-63215: FedEx Shipment Tracking fails for valid tracking number

 - Refactored dates parsing

Author: YevSent

app/code/Magento/Fedex/Model/Carrier.php

@@ -1731,19 +1731,15 @@ private function parseDate($timestamp)
             return false;
         }
         $formats = [\DateTime::ATOM, 'Y-m-d\TH:i:s'];
-        $tz = date_default_timezone_get();
-
         foreach ($formats as $format) {
             // set UTC timezone for a case if timestamp does not contain any timezone
-            date_default_timezone_set('UTC');
-            $dateTime = \DateTime::createFromFormat($format, $timestamp);
+            $utcTimezone = new \DateTimeZone('UTC');
+            $dateTime = \DateTime::createFromFormat($format, $timestamp, $utcTimezone);
             if ($dateTime !== false) {
-                date_default_timezone_set($tz);
                 return $dateTime;
             }
         }
 
-        date_default_timezone_set($tz);
         return false;
     }
 }

app/code/Magento/Fedex/Test/Unit/Model/CarrierTest.php

@@ -393,9 +393,9 @@ public function testGetTrackingErrorResponse()
 
     /**
      * @covers \Magento\Fedex\Model\Carrier::getTracking
-     * @param string $shipTimestamp
-     * @param string $expectedDate
+     * @param string $shipTimeStamp
      * @param string $expectedDate
+     * @param string $expectedTime
      * @dataProvider shipDateDataProvider
      */
     public function testGetTracking($shipTimeStamp, $expectedDate, $expectedTime)
@@ -480,9 +480,9 @@ public function shipDateDataProvider()
 
     /**
      * @covers \Magento\Fedex\Model\Carrier::getTracking
-     * @param string $shipTimestamp
-     * @param string $expectedDate
+     * @param string $shipTimeStamp
      * @param string $expectedDate
+     * @param string $expectedTime
      * @dataProvider shipDateDataProvider
      */
     public function testGetTrackingWithEvents($shipTimeStamp, $expectedDate, $expectedTime)