Unable to transform value for property path : Expected a \DateTime or \DateTimeInterface
<p>First of all: I'm pretty new to Symfony/programming and have problems finding the solution I need. </p>

<p>I have these variables in my 'Event' Entity with standard getters and setters.:</p>

<pre><code> /**
 * @var \DateTime
 *
 * @ORM\Column(name="startTime", type="time", nullable=true)
 *
 * @Assert\Expression(
 *     "this.getStartTime() &lt;= this.getEndTime()",
 *     message="Start time should be less or equal to end date!"
 * )
 */
private $startTime;

/**
 * @var \DateTime
 *
 * @ORM\Column(name="endTime", type="time", nullable=true)
 *
 * @Assert\Expression(
 *     "this.getEndTime() &gt;= this.getStartTime()",
 *     message="End time should be greater or equal to start time!"
 * )
 */
private $endTime;
</code></pre>

<p>I have this Controller for my form:</p>

<pre><code>&lt;?php


namespace AppBundle\Controller;


use AppBundle\Entity\Event;
use AppBundle\Form\EventCreateFormType;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class EventController extends Controller {

/**
 * @Route("/eventmanager", name="event")
 */
public function eventsAction(Request $request)
{
    $events = $this-&gt;getDoctrine()// query database and get all events
    -&gt;getRepository('AppBundle:Event')
        -&gt;findAll();

    $event = new Event();

    $adminstatus = false;

    if (in_array('ROLE_ADMIN', $this-&gt;getUser()-&gt;getRoles())) {
        $adminstatus = true;
    }
    $event = $this-&gt;get('holiday.service')-&gt;createEventForm($request);
    $form = $this-&gt;createForm(EventCreateFormType::class, $event, array('rolestatus' =&gt; $adminstatus));


    if ($form-&gt;isValid()) {

        $em = $this-&gt;getDoctrine()-&gt;getManager();
        $em-&gt;persist($event);
        $em-&gt;flush();

        return $this-&gt;redirectToRoute('event'); // redirect to route: events
    }

    return $this-&gt;render('default/eventmanager.html.twig', array('events' =&gt; $events, 'form' =&gt; $form-&gt;createView()));
}
</code></pre>

<p>With this type:</p>

<pre><code>&lt;?php


namespace AppBundle\Form;


use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Extension\Core\Type\TextareaType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\TimeType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class EventCreateFormType extends AbstractType {

public function buildForm(FormBuilderInterface $builder, array $options)
{
    parent::buildForm($builder, $options);

    $builder
        -&gt;add('title', TextType::class, array(
            'label' =&gt; 'event.form.title.label',
            'attr' =&gt; array(
                'maxlength' =&gt; 75,
                '' =&gt; '')
        ))
        -&gt;add('dateOf', TextType::class, array(
            'label' =&gt; 'event.form.dateOf.label',
//                'widget' =&gt; 'single_text',
//                'html5' =&gt; false,
            'attr' =&gt; [
                'class' =&gt; 'js-datepicker',
//                    'format' =&gt; 'dd-MM-yyyy',
            ],
        ))
        -&gt;add('startTime', TimeType::class, array(
            'label' =&gt; 'event.form.startTime.label',
        ))
        -&gt;add('endTime', TimeType::class, array(
            'label' =&gt; 'event.form.endTime.label',
        ))
        -&gt;add('notice', TextareaType::class, array(
            'label' =&gt; 'event.form.notice.label',
            'required' =&gt; false,
            'attr' =&gt; array('maxlength' =&gt; 2500)
        ));
    if ($options['rolestatus'] == true) {
        $builder-&gt;add('status', ChoiceType::class, array(
            'label' =&gt; 'event.form.status.label',
            'data' =&gt; $options['rolestatus'],
            'choices' =&gt; array(
                'event.form.status.public' =&gt; true,
                'event.form.status.private' =&gt; false
            ),
            'choices_as_values' =&gt; true
        ));
    }
    $builder-&gt;add('save', SubmitType::class, array(
        'label' =&gt; 'event.form.create.button'
    ));


}

public function configureOptions(OptionsResolver $resolver)
{
    $configs = $resolver-&gt;getDefinedOptions();
    $configs[] = 'rolestatus';
    $resolver-&gt;setDefined($configs);
}
</code></pre>

<p>}</p>

<p>And this service:</p>

<pre><code>&lt;?php

namespace AppBundle\Controller\Services;

use AppBundle\Entity\Event;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;

class HolidayServiceController extends Controller {



public function createEventForm(Request $request) {

    $submittedForm = $request-&gt;get('event_create_form');
    $adminstatus = false;
    if (in_array('ROLE_ADMIN', $this-&gt;getUser()-&gt;getRoles())) {
        $adminstatus = true;
    }
    dump($submittedForm);

    $event = new Event();
    if (!empty($submittedForm)) {

            $creator = $this-&gt;getUser();
            $title = $submittedForm['title'];
            $startTime = $submittedForm['startTime'];
            $endTime = $submittedForm['endTime'];
            $notice = $submittedForm['notice'];
            $now = new\DateTime();
            $dateOf = new \DateTime();
            $explodedDate = explode('-', $submittedForm['dateOf']);
            $dateOf-&gt;setDate($explodedDate[2], $explodedDate[1], $explodedDate[0]);

            $event-&gt;setTitle($title);
            $event-&gt;setDateOf($dateOf);
            $event-&gt;setStartTime($startTime);
            $event-&gt;setEndTime($endTime);
            $event-&gt;setNotice($notice);
            $event-&gt;setCreator($creator);
            $event-&gt;setCreatedAt($now);
            if (!empty($submittedForm) &amp;&amp; $adminstatus == true) {
                $status = $submittedForm['status'];
                $event-&gt;setStatus($status);
            } else {
                $event-&gt;setStatus(false);
            }
            return $event;
        }
    return $event;


}
}
</code></pre>

<p>Now, when i try to create a new Event I get following error:</p>

<p>Unable to transform value for property path "startTime": Expected a \DateTime or \DateTimeInterface.
500 Internal Server Error - TransformationFailedException</p>

<p>I know that this is happening because I'm passing an array of startTime but not an object.</p>

<p>What do I have to change to accomplish that?</p>

<p>thx in advance.</p>