diff --git a/ModelDescriber/DateTimeModelDescriber.php b/ModelDescriber/DateTimeModelDescriber.php
new file mode 100644
index 0000000..36fbfaa
--- /dev/null
+++ b/ModelDescriber/DateTimeModelDescriber.php
@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of the NelmioApiDocBundle package.
+ *
+ * (c) Nelmio
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Nelmio\ApiDocBundle\ModelDescriber;
+
+use EXSyst\Component\Swagger\Schema;
+use Nelmio\ApiDocBundle\Model\Model;
+
+class DateTimeModelDescriber implements ModelDescriberInterface
+{
+    public function describe(Model $model, Schema $schema)
+    {
+        $schema->setType('string');
+        $schema->setFormat('date-time');
+    }
+
+    public function supports(Model $model): bool
+    {
+        return 'DateTime' === $model->getType()->getClassName() || 'DateTimeImmutable' === $model->getType()->getClassName();
+    }
+}
diff --git a/Resources/config/services.xml b/Resources/config/services.xml
index 2fa25bd..81bdaba 100644
--- a/Resources/config/services.xml
+++ b/Resources/config/services.xml
@@ -56,6 +56,10 @@
             <tag name="nelmio_api_doc.model_describer" />
         </service>
 
+        <service id="nelmio_api_doc.model_describers.datetime" class="Nelmio\ApiDocBundle\ModelDescriber\DateTimeModelDescriber" public="false">
+            <tag name="nelmio_api_doc.model_describer" priority="100" />
+        </service>
+
         <service id="nelmio_api_doc.model_describers.collection" class="Nelmio\ApiDocBundle\ModelDescriber\CollectionModelDescriber" public="false">
             <tag name="nelmio_api_doc.model_describer" />
         </service>
diff --git a/Tests/Functional/Entity/User.php b/Tests/Functional/Entity/User.php
index 39fb774..ff69567 100644
--- a/Tests/Functional/Entity/User.php
+++ b/Tests/Functional/Entity/User.php
@@ -16,7 +16,21 @@ namespace Nelmio\ApiDocBundle\Tests\Functional\Entity;
  */
 class User
 {
-    public function addUsers(User $user)
+    /**
+     * @var \DateTime
+     */
+    private $createdAt;
+
+    /**
+     * @var User[]
+     */
+    private $users;
+
+    public function setCreatedAt(\DateTime $createAt)
+    {
+    }
+
+    public function setUsers(array $users)
     {
     }
 
diff --git a/Tests/Functional/FunctionalTest.php b/Tests/Functional/FunctionalTest.php
index 1d99632..c0e71ec 100644
--- a/Tests/Functional/FunctionalTest.php
+++ b/Tests/Functional/FunctionalTest.php
@@ -150,12 +150,20 @@ class FunctionalTest extends WebTestCase
         $model = $this->getModel('User');
         $this->assertEquals('object', $model->getType());
         $properties = $model->getProperties();
+        $this->assertCount(3, $properties);
 
         $this->assertTrue($properties->has('users'));
         $this->assertEquals('#/definitions/User[]', $properties->get('users')->getRef());
 
         $this->assertTrue($properties->has('dummy'));
         $this->assertEquals('#/definitions/Dummy2', $properties->get('dummy')->getRef());
+
+        $this->assertTrue($properties->has('createdAt'));
+        $this->assertEquals('#/definitions/DateTime', $properties->get('createdAt')->getRef());
+
+        $model = $this->getModel('DateTime');
+        $this->assertEquals('string', $model->getType());
+        $this->assertEquals('date-time', $model->getFormat());
     }
 
     public function testUsersModel()
diff --git a/Tests/Functional/JMSFunctionalTest.php b/Tests/Functional/JMSFunctionalTest.php
index b11507a..1f111eb 100644
--- a/Tests/Functional/JMSFunctionalTest.php
+++ b/Tests/Functional/JMSFunctionalTest.php
@@ -11,8 +11,6 @@
 
 namespace Nelmio\ApiDocBundle\Tests\Functional;
 
-use JMS\SerializerBundle\JMSSerializerBundle;
-
 class JMSFunctionalTest extends WebTestCase
 {
     public function testModelDocumentation()