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diff --git a/web/core/modules/system/tests/src/Functional/Datetime/DrupalDateTimeTest.php b/web/core/modules/system/tests/src/Functional/Datetime/DrupalDateTimeTest.php
new file mode 100644
index 000000000..d2114fdf8
--- /dev/null
+++ b/web/core/modules/system/tests/src/Functional/Datetime/DrupalDateTimeTest.php
@@ -0,0 +1,119 @@
+<?php
+
+namespace Drupal\Tests\system\Functional\Datetime;
+
+use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\Tests\BrowserTestBase;
+use Drupal\user\Entity\User;
+
+/**
+ * Tests DrupalDateTime functionality.
+ *
+ * @group Datetime
+ */
+class DrupalDateTimeTest extends BrowserTestBase {
+
+  /**
+   * Set up required modules.
+   */
+  public static $modules = [];
+
+  /**
+   * Test setup.
+   */
+  protected function setUp() {
+    parent::setUp();
+
+  }
+
+  /**
+   * Test that the AJAX Timezone Callback can deal with various formats.
+   */
+  public function testSystemTimezone() {
+    $options = [
+      'query' => [
+        'date' => 'Tue+Sep+17+2013+21%3A35%3A31+GMT%2B0100+(BST)#',
+      ]
+    ];
+    // Query the AJAX Timezone Callback with a long-format date.
+    $response = $this->drupalGet('system/timezone/BST/3600/1', $options);
+    $this->assertEqual($response, '"Europe\/London"', 'Timezone AJAX callback successfully identifies and responds to a long-format date.');
+  }
+
+  /**
+   * Test that DrupalDateTime can detect the right timezone to use.
+   * Test with a variety of less commonly used timezone names to
+   * help ensure that the system timezone will be different than the
+   * stated timezones.
+   */
+  public function testDateTimezone() {
+    $date_string = '2007-01-31 21:00:00';
+
+    // Make sure no site timezone has been set.
+    $this->config('system.date')
+      ->set('timezone.user.configurable', 0)
+      ->set('timezone.default', NULL)
+      ->save();
+
+    // Detect the system timezone.
+    $system_timezone = date_default_timezone_get();
+
+    // Create a date object with an unspecified timezone, which should
+    // end up using the system timezone.
+    $date = new DrupalDateTime($date_string);
+    $timezone = $date->getTimezone()->getName();
+    $this->assertTrue($timezone == $system_timezone, 'DrupalDateTime uses the system timezone when there is no site timezone.');
+
+    // Create a date object with a specified timezone.
+    $date = new DrupalDateTime($date_string, 'America/Yellowknife');
+    $timezone = $date->getTimezone()->getName();
+    $this->assertTrue($timezone == 'America/Yellowknife', 'DrupalDateTime uses the specified timezone if provided.');
+
+    // Set a site timezone.
+    $this->config('system.date')->set('timezone.default', 'Europe/Warsaw')->save();
+
+    // Create a date object with an unspecified timezone, which should
+    // end up using the site timezone.
+    $date = new DrupalDateTime($date_string);
+    $timezone = $date->getTimezone()->getName();
+    $this->assertTrue($timezone == 'Europe/Warsaw', 'DrupalDateTime uses the site timezone if provided.');
+
+    // Create user.
+    $this->config('system.date')->set('timezone.user.configurable', 1)->save();
+    $test_user = $this->drupalCreateUser([]);
+    $this->drupalLogin($test_user);
+
+    // Set up the user with a different timezone than the site.
+    $edit = ['mail' => $test_user->getEmail(), 'timezone' => 'Asia/Manila'];
+    $this->drupalPostForm('user/' . $test_user->id() . '/edit', $edit, t('Save'));
+
+    // Reload the user and reset the timezone in AccountProxy::setAccount().
+    \Drupal::entityManager()->getStorage('user')->resetCache();
+    $this->container->get('current_user')->setAccount(User::load($test_user->id()));
+
+    // Create a date object with an unspecified timezone, which should
+    // end up using the user timezone.
+    $date = new DrupalDateTime($date_string);
+    $timezone = $date->getTimezone()->getName();
+    $this->assertTrue($timezone == 'Asia/Manila', 'DrupalDateTime uses the user timezone, if configurable timezones are used and it is set.');
+  }
+
+  /**
+   * Tests the ability to override the time zone in the format method.
+   */
+  public function testTimezoneFormat() {
+    // Create a date in UTC
+    $date = DrupalDateTime::createFromTimestamp(87654321, 'UTC');
+
+    // Verify that the date format method displays the default time zone.
+    $this->assertEqual($date->format('Y/m/d H:i:s e'), '1972/10/11 12:25:21 UTC', 'Date has default UTC time zone and correct date/time.');
+
+    // Verify that the format method can override the time zone.
+    $this->assertEqual($date->format('Y/m/d H:i:s e', ['timezone' => 'America/New_York']), '1972/10/11 08:25:21 America/New_York', 'Date displayed overidden time zone and correct date/time');
+
+    // Verify that the date format method still displays the default time zone
+    // for the date object.
+    $this->assertEqual($date->format('Y/m/d H:i:s e'), '1972/10/11 12:25:21 UTC', 'Date still has default UTC time zone and correct date/time');
+  }
+
+}