diff --git a/Models/Calendar.php b/Models/Calendar.php
index b44820f..71acbb6 100755
--- a/Models/Calendar.php
+++ b/Models/Calendar.php
@@ -193,4 +193,25 @@ class Calendar
 
         return false;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toArray() : array
+    {
+        return [
+            'id'    => $this->id,
+            'name' => $this->name,
+            'description' => $this->description,
+            'createdAt' => $this->createdAt,
+        ];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function jsonSerialize()
+    {
+        return $this->toArray();
+    }
 }
diff --git a/Models/Event.php b/Models/Event.php
index de11a0a..42dd156 100755
--- a/Models/Event.php
+++ b/Models/Event.php
@@ -349,4 +349,32 @@ class Event
     {
         return $this->tags[$id] ?? new NullTag();
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toArray() : array
+    {
+        return [
+            'id'    => $this->id,
+            'name' => $this->name,
+            'description' => $this->description,
+            'type' => $this->type,
+            'status' => $this->status,
+            'schedule' => $this->schedule,
+            'location' => $this->location,
+            'calendar' => $this->calendar,
+            'people' => $this->people,
+            'tags' => $this->tags,
+            'createdAt' => $this->createdAt,
+        ];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function jsonSerialize()
+    {
+        return $this->toArray();
+    }
 }
diff --git a/Models/Schedule.php b/Models/Schedule.php
index c667909..3ce3e25 100755
--- a/Models/Schedule.php
+++ b/Models/Schedule.php
@@ -295,4 +295,31 @@ class Schedule
     {
         return $this->freqInterval;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toArray() : array
+    {
+        return [
+            'id'    => $this->id,
+            'uuid' => $this->uid,
+            'status' => $this->status,
+            'freqType' => $this->freqType,
+            'freqInterval' => $this->freqInterval,
+            'relativeInternal' => $this->relativeInternal,
+            'intervalType' => $this->intervalType,
+            'recurrenceFactor' => $this->recurrenceFactor,
+            'start' => $this->start,
+            'createdAt' => $this->createdAt,
+        ];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function jsonSerialize()
+    {
+        return $this->toArray();
+    }
 }
diff --git a/tests/Models/CalendarTest.php b/tests/Models/CalendarTest.php
index 8b664e0..8f21e49 100755
--- a/tests/Models/CalendarTest.php
+++ b/tests/Models/CalendarTest.php
@@ -138,4 +138,26 @@ final class CalendarTest extends \PHPUnit\Framework\TestCase
         self::assertEquals([], $this->calendar->getEventsOnDate(new \DateTime('2005-10-10')));
         self::assertEquals([$event], $this->calendar->getEventsOnDate(new \DateTime('2005-10-09')));
     }
+
+    /**
+     * @covers Modules\Calendar\Models\Calendar
+     * @group module
+     */
+    public function testSerialize() : void
+    {
+        $this->calendar->name = 'Name';
+        $this->calendar->description = 'Description';
+
+        $serialized = $this->calendar->jsonSerialize();
+        unset($serialized['createdAt']);
+
+        self::assertEquals(
+            [
+                'id'    => 0,
+                'name' => 'Name',
+                'description' => 'Description',
+            ],
+            $serialized
+        );
+    }
 }
diff --git a/tests/Models/EventTest.php b/tests/Models/EventTest.php
index 3cadab8..d07f283 100755
--- a/tests/Models/EventTest.php
+++ b/tests/Models/EventTest.php
@@ -166,4 +166,35 @@ final class EventTest extends \PHPUnit\Framework\TestCase
         self::assertCount(0, $this->event->getTags());
         self::assertFalse($this->event->removeTag(0));
     }
+
+    /**
+     * @covers Modules\Calendar\Models\Event
+     * @group module
+     */
+    public function testSerialize() : void
+    {
+        $this->event->name = 'Name';
+        $this->event->description = 'Description';
+        $this->event->setType(EventType::TEMPLATE);
+        $this->event->setStatus(EventStatus::INACTIVE);
+
+        $serialized = $this->event->jsonSerialize();
+        unset($serialized['location']);
+        unset($serialized['schedule']);
+        unset($serialized['createdAt']);
+
+        self::assertEquals(
+            [
+                'id'    => 0,
+                'name' => 'Name',
+                'description' => 'Description',
+                'type' => EventType::TEMPLATE,
+                'status' => EventStatus::INACTIVE,
+                'calendar' => 0,
+                'people' => [],
+                'tags' => [],
+            ],
+            $serialized
+        );
+    }
 }
diff --git a/tests/Models/ScheduleTest.php b/tests/Models/ScheduleTest.php
index e762e4a..88fec9d 100644
--- a/tests/Models/ScheduleTest.php
+++ b/tests/Models/ScheduleTest.php
@@ -152,4 +152,35 @@ final class ScheduleTest extends \PHPUnit\Framework\TestCase
         $this->expectException(\phpOMS\Stdlib\Base\Exception\InvalidEnumValue::class);
         $this->schedule->setIntervalType(999);
     }
+
+    /**
+     * @covers Modules\Calendar\Models\Schedule
+     * @group module
+     */
+    public function testSerialize() : void
+    {
+        $this->schedule->setStatus(ScheduleStatus::INACTIVE);
+        $this->schedule->setFreqType(FrequencyType::YEARLY);
+        $this->schedule->setFreqInterval(FrequencyInterval::DAY);
+        $this->schedule->setFrequencyRelative(FrequencyRelative::LAST);
+        $this->schedule->setIntervalType(IntervalType::RELATIVE);
+
+        $serialized = $this->schedule->jsonSerialize();
+        unset($serialized['start']);
+        unset($serialized['createdAt']);
+
+        self::assertEquals(
+            [
+                'id'    => 0,
+                'uuid' => '',
+                'status' => ScheduleStatus::INACTIVE,
+                'freqType' => FrequencyType::YEARLY,
+                'freqInterval' => FrequencyInterval::DAY,
+                'relativeInternal' => FrequencyRelative::LAST,
+                'intervalType' => IntervalType::RELATIVE,
+                'recurrenceFactor' => 0,
+            ],
+            $serialized
+        );
+    }
 }