diff --git a/core/modules/migrate/src/Plugin/migrate/process/FormatDate.php b/core/modules/migrate/src/Plugin/migrate/process/FormatDate.php
index e34314e..2148656 100644
--- a/core/modules/migrate/src/Plugin/migrate/process/FormatDate.php
+++ b/core/modules/migrate/src/Plugin/migrate/process/FormatDate.php
@@ -16,9 +16,8 @@
  *   @link http://php.net/manual/datetime.createfromformat.php \DateTime::createFromFormat. @endlink
  * - to_format: The destination format.
  * - timezone: (deprecated) String identifying the required time zone, see
- *   DateTimePlus::__construct(). The timezone configuration key is deprecated
- *   in Drupal 8.4.0 and will be removed before Drupal 9.0.0, use from_timezone
- *   and to_timezone instead.
+ *   DateTimePlus::__construct(). The timezone configuration key will be removed
+ *   before Drupal 9.0.0, use from_timezone and to_timezone instead.
  * - from_timezone: String identifying the required source time zone, see
  *   DateTimePlus::__construct().
  * - to_timezone: String identifying the required destination time zone, see
@@ -116,7 +115,7 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
     if (isset($this->configuration['timezone'])) {
       @trigger_error('Configuration key "timezone" is deprecated in 8.4.0 and will be removed before Drupal 9.0.0, use "from_timezone" and "to_timezone" instead. See https://www.drupal.org/node/2885746', E_USER_DEPRECATED);
       $from_timezone = $this->configuration['timezone'];
-      $to_timezone = NULL;
+      $to_timezone = isset($this->configuration['to_timezone']) ? $this->configuration['to_timezone'] : NULL;
     }
     else {
       $system_timezone = date_default_timezone_get();
diff --git a/core/modules/migrate/tests/src/Unit/process/FormatDateTest.php b/core/modules/migrate/tests/src/Unit/process/FormatDateTest.php
index 67eddae..e84cec1 100644
--- a/core/modules/migrate/tests/src/Unit/process/FormatDateTest.php
+++ b/core/modules/migrate/tests/src/Unit/process/FormatDateTest.php
@@ -15,17 +15,6 @@
 class FormatDateTest extends MigrateProcessTestCase {
 
   /**
-   * Tests the assumption that local time is in 'Australia/Sydney'.
-   */
-  public function testLocalTimeZone() {
-    // @todo The 'Australia/Sydney' time zone is set in core/tests/bootstrap.php
-    // This assertion checks that the assumptions about local time in the rest
-    // of the test methods are accurate. This should be removed when
-    // @link https://www.drupal.org/node/2889803 @endlink is committed.
-    $this->assertEquals('Australia/Sydney', date_default_timezone_get());
-  }
-
-  /**
    * Tests that missing configuration will throw an exception.
    */
   public function testMigrateExceptionMissingFromFormat() {