diff --git a/src/Factory/LtiSerializerFactory.php b/src/Factory/LtiSerializerFactory.php
index bcede59..0e294e4 100644
--- a/src/Factory/LtiSerializerFactory.php
+++ b/src/Factory/LtiSerializerFactory.php
@@ -4,6 +4,7 @@
 
 namespace OAT\Library\EnvironmentManagementLtiEvents\Factory;
 
+use DateTimeInterface;
 use OAT\Library\EnvironmentManagementLtiEvents\Normalizer\Ags\LineItemNormalizer;
 use OAT\Library\EnvironmentManagementLtiEvents\Normalizer\Ags\ScoreNormalizer;
 use OAT\Library\EnvironmentManagementLtiEvents\Normalizer\Ags\SubmissionReviewNormalizer;
@@ -15,6 +16,7 @@
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
 use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
 use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;
+use Symfony\Component\Serializer\Normalizer\JsonSerializableNormalizer;
 use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\SerializerInterface;
@@ -34,7 +36,8 @@ public static function create(): SerializerInterface
                 new ScoreNormalizer(),
                 new AcsControlNormalizer(),
                 new ResourceLinkNormalizer(),
-                new DateTimeNormalizer(),
+                new JsonSerializableNormalizer(),
+                new DateTimeNormalizer([DateTimeNormalizer::FORMAT_KEY => DateTimeInterface::RFC3339_EXTENDED]),
                 new ObjectNormalizer($classMetaDataFactory, null, null, null, $classDiscriminator),
             ],
             [
diff --git a/tests/Unit/Factory/LtiSerializerTest.php b/tests/Unit/Factory/LtiSerializerTest.php
new file mode 100644
index 0000000..a848a30
--- /dev/null
+++ b/tests/Unit/Factory/LtiSerializerTest.php
@@ -0,0 +1,112 @@
+<?php
+
+/**
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; under version 2
+ * of the License (non-upgradable).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (c) 2022 (original work) Open Assessment Technologies SA;
+ *
+ * @author Sergei Mikhailov <sergei.mikhailov@taotesting.com>
+ */
+
+declare(strict_types=1);
+
+namespace OAT\Library\EnvironmentManagementLtiEvents\Tests\Unit\Factory;
+
+use DateTimeImmutable;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Ags\CreateLineItemEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Ags\DeleteLineItemEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Ags\GetLineItemEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Ags\ListLineItemsEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Ags\ListResultsEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Ags\PublishScoreEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Ags\UpdateLineItemEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\BasicOutcome\DeleteResultEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\BasicOutcome\ReadResultEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\BasicOutcome\ReplaceResultEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\BasicOutcome\SendBasicOutcomeEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Core\RequestEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\EventInterface;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Nrps\GetContextMembershipEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Nrps\GetResourceLinkMembershipEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Event\Proctoring\SendControlEvent;
+use OAT\Library\EnvironmentManagementLtiEvents\Factory\LtiSerializerFactory;
+use OAT\Library\Lti1p3Ags\Model\LineItem\LineItem;
+use OAT\Library\Lti1p3Ags\Model\Score\Score;
+use OAT\Library\Lti1p3Core\Resource\LtiResourceLink\LtiResourceLink;
+use OAT\Library\Lti1p3Proctoring\Model\AcsControl;
+use OAT\Library\Lti1p3Proctoring\Model\AcsControlInterface;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Serializer\Encoder\JsonEncoder;
+use Symfony\Component\Serializer\SerializerInterface;
+
+class LtiSerializerTest extends TestCase
+{
+    private SerializerInterface $sut;
+
+    /**
+     * @before
+     */
+    public function init(): void
+    {
+        $this->sut = LtiSerializerFactory::create();
+    }
+
+    /**
+     * @dataProvider dataProvider
+     */
+    public function testEventSerialization(EventInterface $event): void
+    {
+        $this->assertEquals(
+            $event,
+            $this->sut->deserialize(
+                $this->sut->serialize($event, JsonEncoder::FORMAT),
+                EventInterface::class,
+                JsonEncoder::FORMAT
+            )
+        );
+    }
+
+    public function dataProvider(): array
+    {
+        return [
+            [new CreateLineItemEvent('test', new LineItem(1, 'test'), 'https://example.com')],
+            [new DeleteLineItemEvent('test', 'https://example.com')],
+            [new GetLineItemEvent('test', 'https://example.com')],
+            [new ListLineItemsEvent('test', 'https://example.com')],
+            [new ListResultsEvent('test', 'https://example.com')],
+            [new PublishScoreEvent('test', new Score('test'), 'https://example.com')],
+            [new UpdateLineItemEvent('test', new LineItem(1, 'test'))],
+            [new DeleteResultEvent('test', 'https://example.com', 'test')],
+            [new ReadResultEvent('test', 'https://example.com', 'test')],
+            [new ReplaceResultEvent('test', 'https://example.com', 'test', 1)],
+            [new SendBasicOutcomeEvent('test', 'https://example.com', '<xml/>')],
+            [new RequestEvent('test', 'GET', 'https://example.com')],
+            [new GetContextMembershipEvent('test', 'https://example.com')],
+            [new GetResourceLinkMembershipEvent('test', 'https://example.com', 'test')],
+            [
+                new SendControlEvent(
+                    'test',
+                    new AcsControl(
+                        new LtiResourceLink('https://example.com'),
+                        'test',
+                        AcsControlInterface::ACTION_PAUSE,
+                        DateTimeImmutable::createFromFormat('U.u', sprintf('%.3f', microtime(true)))
+                    ),
+                    'https://example.com'
+                ),
+            ],
+        ];
+    }
+}