diff --git a/core/modules/datetime/lib/Drupal/datetime/Tests/DateTimeItemTest.php b/core/modules/datetime/lib/Drupal/datetime/Tests/DateTimeItemTest.php
new file mode 100644
index 0000000..318cc8a
--- /dev/null
+++ b/core/modules/datetime/lib/Drupal/datetime/Tests/DateTimeItemTest.php
@@ -0,0 +1,125 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\datetime\Tests\DateTimeItemTest.
+ */
+
+namespace Drupal\datetime\Tests;
+
+use Drupal\Core\Entity\Field\FieldInterface;
+use Drupal\Core\Entity\Field\FieldItemInterface;
+use Drupal\field\Tests\FieldUnitTestBase;
+
+/**
+ * Tests the new entity API for the date field type.
+ */
+class DateTimeItemTest extends FieldUnitTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('datetime');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Date field item',
+      'description' => 'Tests the new entity API for the Date field type.',
+      'group' => 'Field types',
+    );
+  }
+
+  public function setUp() {
+    parent::setUp();
+
+    // Create a field with settings to validate.
+    $this->field = field_create_field(array(
+      'field_name' => 'field_datetime',
+      'type' => 'datetime',
+      'settings' => array('datetime_type' => 'date'),
+    ));
+    $this->instance = field_create_instance(array(
+      'field_name' => $this->field['field_name'],
+      'entity_type' => 'entity_test',
+      'bundle' => 'entity_test',
+      'settings' => array(
+        'default_value' => 'blank',
+      ),
+    ));
+  }
+
+  /**
+   * Tests using entity fields of the date field type.
+   */
+  public function testDateTimeItem() {
+    // Verify entity creation.
+    $entity = entity_create('entity_test', array());
+    $value = '2014-01-01T20:00:00Z';
+    $entity->field_datetime = $value;
+    $entity->name->value = $this->randomName();
+    $entity->save();
+
+    // Verify entity has been created properly.
+    $id = $entity->id();
+    $entity = entity_load('entity_test', $id);
+    $this->assertTrue($entity->field_datetime instanceof FieldInterface, 'Field implements interface.');
+    $this->assertTrue($entity->field_datetime[0] instanceof FieldItemInterface, 'Field item implements interface.');
+    $this->assertEqual($entity->field_datetime->value, $value);
+    $this->assertEqual($entity->field_datetime[0]->value, $value);
+
+    // Verify changing the date value.
+    $new_value = $this->randomName();
+    $entity->field_datetime->value = $new_value;
+    $this->assertEqual($entity->field_datetime->value, $new_value);
+
+    // Read changed entity and assert changed values.
+    $entity->save();
+    $entity = entity_load('entity_test', $id);
+    $this->assertEqual($entity->field_datetime->value, $new_value);
+  }
+
+  /**
+   * Tests DateTimeItem::setValue().
+   */
+  public function testSetValue() {
+    // Test DateTimeItem::setValue() using string.
+    $entity = entity_create('entity_test', array());
+    $value = '2014-01-01T20:00:00Z';
+    $entity->get('field_datetime')->offsetGet(0)->setValue($value);
+    $entity->save();
+    // Load the entity and ensure the field was saved correctly.
+    $id = $entity->id();
+    $entity = entity_load('entity_test', $id);
+    $this->assertEqual($entity->field_datetime[0]->value, $value, 'DateTimeItem::setValue() works with string value.');
+
+    // Test DateTimeItem::setValue() using property array.
+    $entity = entity_create('entity_test', array());
+    $value = '2014-01-01T20:00:00Z';
+    $entity->get('field_datetime')->offsetGet(0)->setValue(array('value' => $value));
+    $entity->save();
+    // Load the entity and ensure the field was saved correctly.
+    $id = $entity->id();
+    $entity = entity_load('entity_test', $id);
+    $this->assertEqual($entity->field_datetime[0]->value, $value, 'DateTimeItem::setValue() works with array value.');
+  }
+
+  /**
+   * Tests setting the value of the DateTimeItem directly.
+   */
+  public function testSetValueProperty() {
+    // Test Date::setValue().
+    $entity = entity_create('entity_test', array());
+    $value = '2014-01-01T20:00:00Z';
+    // WHY DOES THIS FAIL????
+    // @todo Make this not fail.
+    $entity->get('field_datetime')->offsetGet(0)->get('value')->setValue($value);
+    $entity->save();
+    // Load the entity and ensure the field was saved correctly.
+    $id = $entity->id();
+    $entity = entity_load('entity_test', $id);
+    $this->assertEqual($entity->field_datetime[0]->value, $value, '"Value" property can be set directly.');
+  }
+
+}