diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index 2294d47..0c1115c 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -82,6 +82,9 @@
  *
  * @see http://php.net/manual/reserved.variables.server.php
  * @see http://php.net/manual/function.time.php
+ *
+ * @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0.
+ *   Use \Drupal::time()->getRequestTime();
  */
 define('REQUEST_TIME', (int) $_SERVER['REQUEST_TIME']);
 
diff --git a/core/lib/Drupal/Component/Datetime/Time.php b/core/lib/Drupal/Component/Datetime/Time.php
index 8697bb1..969843c 100644
--- a/core/lib/Drupal/Component/Datetime/Time.php
+++ b/core/lib/Drupal/Component/Datetime/Time.php
@@ -33,6 +33,13 @@ public function getRequestTime() {
   /**
    * @inheritdoc
    */
+  public function getRequestMicroTime() {
+    return $this->requestStack->getCurrentRequest()->server->get('REQUEST_TIME_FLOAT');
+  }
+
+  /**
+   * @inheritdoc
+   */
   public function getCurrentTime() {
     return time();
   }
diff --git a/core/lib/Drupal/Component/Datetime/TimeInterface.php b/core/lib/Drupal/Component/Datetime/TimeInterface.php
index dce752e..18a4b7b 100644
--- a/core/lib/Drupal/Component/Datetime/TimeInterface.php
+++ b/core/lib/Drupal/Component/Datetime/TimeInterface.php
@@ -13,6 +13,14 @@
   public function getRequestTime();
 
   /**
+   * Returns the timestamp for the current request with microsecond precision.
+   *
+   * @return float
+   *  A Unix timestamp with a factional portion.
+   */
+  public function getRequestMicroTime();
+
+  /**
    * Returns the current system time as an integer.
    *
    * @return int
@@ -21,7 +29,7 @@ public function getRequestTime();
   public function getCurrentTime();
 
   /**
-   * Returns the current system time as a float.
+   * Returns the current system time with microsecond precision.
    *
    * @return float
    *   A Unix timestamp with a factional portion.
diff --git a/core/tests/Drupal/Tests/Component/Datetime/TimeTest.php b/core/tests/Drupal/Tests/Component/Datetime/TimeTest.php
index 22ffed7..c856e4f 100644
--- a/core/tests/Drupal/Tests/Component/Datetime/TimeTest.php
+++ b/core/tests/Drupal/Tests/Component/Datetime/TimeTest.php
@@ -28,7 +28,7 @@ function microtime() {
 /**
  * Set up the real namespace for the test.
  */
-namespace Drupal\Tests\Core\Datetime {
+namespace Drupal\Tests\Component\Datetime {
 
   use Drupal\Component\Datetime\Time;
   use Drupal\Tests\UnitTestCase;
@@ -83,6 +83,25 @@ public function testGetRequestTime() {
     }
 
     /**
+     * Tests the getRequestMicroTime method.
+     *
+     * @covers ::getRequestMicroTime
+     */
+    public function testGetRequestMicroTime() {
+      $expected = 1234567.89;
+
+      $request = Request::createFromGlobals();
+      $request->server->set('REQUEST_TIME_FLOAT', $expected);
+
+      // Mocks a the request stack getting the current request.
+      $this->requestStack->expects($this->any())
+                         ->method('getCurrentRequest')
+                         ->willReturn($request);
+
+      $this->assertEquals($expected, $this->time->getRequestMicroTime());
+    }
+
+    /**
      * Tests the getCurrentTime method.
      *
      * @covers ::getCurrentTime