diff --git a/src/HPCloud/Services/IdentityServices.php b/src/HPCloud/Services/IdentityServices.php
index 9ed9c65..492e03f 100644
--- a/src/HPCloud/Services/IdentityServices.php
+++ b/src/HPCloud/Services/IdentityServices.php
@@ -483,6 +483,31 @@ class IdentityServices {
     return $this->tokenDetails;
   }
 
+  /**
+   * Check whether the current identity has an expired token.
+   *
+   * This does not perform a round-trip to the server. Instead, it compares the
+   * machine's local timestamp with the server's expiration time stamp. A
+   * mis-configured machine timestamp could give spurious results.
+   *
+   * @retval boolean
+   *   This will return FALSE if there is a current token and it has
+   *   not yet expired (according to the date info). In all other cases
+   *   it returns TRUE.
+   */
+  public function isExpired() {
+    $details = $this->tokenDetails();
+
+    if (empty($details['expires'])) {
+      return TRUE;
+    }
+
+    $currentDateTime = new \DateTime('now');
+    $expireDateTime = new \DateTime($details['expires']);
+
+    return $currentDateTime > $expireDateTime;
+  }
+
   /**
    * Get the service catalog, optionaly filtering by type.
    *
diff --git a/test/Tests/IdentityServicesTest.php b/test/Tests/IdentityServicesTest.php
index 88559de..d624e04 100644
--- a/test/Tests/IdentityServicesTest.php
+++ b/test/Tests/IdentityServicesTest.php
@@ -170,6 +170,16 @@ class IdentityServicesTest extends \HPCloud\Tests\TestCase {
     $this->assertNotEmpty($service->token());
   }
 
+  /**
+   * @depends testAuthenticateAsAccount
+   */
+  public function testIsExpired($service) {
+    $this->assertFalse($service->isExpired());
+
+    $service2 = new IdentityServices(self::conf('hpcloud.identity.url'));
+    $this->assertTrue($service2->isExpired());
+  }
+
   /**
    * @depends testAuthenticateAsAccount
    */