diff --git a/typo3/sysext/belog/Classes/Domain/Model/Constraint.php b/typo3/sysext/belog/Classes/Domain/Model/Constraint.php
index bdea85f1744ca5551e318df767d9e25efb91896c..0385673df5b0beb40b461dea682ab1cdd211a39b 100644
--- a/typo3/sysext/belog/Classes/Domain/Model/Constraint.php
+++ b/typo3/sysext/belog/Classes/Domain/Model/Constraint.php
@@ -251,7 +251,7 @@ class Constraint extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity {
 	 * @param \DateTime $manualDateStart
 	 * @return void
 	 */
-	public function setManualDateStart(\DateTime $manualDateStart) {
+	public function setManualDateStart(\DateTime $manualDateStart = NULL) {
 		$this->manualDateStart = $manualDateStart;
 	}
 
@@ -270,7 +270,7 @@ class Constraint extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity {
 	 * @param \DateTime $manualDateStop
 	 * @return void
 	 */
-	public function setManualDateStop(\DateTime $manualDateStop) {
+	public function setManualDateStop(\DateTime $manualDateStop = NULL) {
 		$this->manualDateStop = $manualDateStop;
 	}
 
diff --git a/typo3/sysext/belog/Tests/Unit/Domain/Model/ConstraintTest.php b/typo3/sysext/belog/Tests/Unit/Domain/Model/ConstraintTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..07a6573c3a2c113879bb89da9c4750028d1ee742
--- /dev/null
+++ b/typo3/sysext/belog/Tests/Unit/Domain/Model/ConstraintTest.php
@@ -0,0 +1,84 @@
+<?php
+namespace TYPO3\CMS\Belog\Tests\Unit\Domain\Model;
+
+/***************************************************************
+ * Copyright notice
+ *
+ * (c) 2014 Steffen Müller <typo3@t3node.com>
+ * All rights reserved
+ *
+ * This script is part of the TYPO3 project. The TYPO3 project 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * The GNU General Public License can be found at
+ * http://www.gnu.org/copyleft/gpl.html.
+ *
+ * This script 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.
+ *
+ * This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+/**
+ * Testcase for \TYPO3\CMS\Belog\Domain\Model\Constraint
+ *
+ * @author Steffen Müller <typo3@t3node.com>
+ */
+class ConstraintTest extends \TYPO3\CMS\Extbase\Tests\Unit\BaseTestCase {
+
+	/**
+	 * @var \TYPO3\CMS\Belog\Domain\Model\Constraint
+	 */
+	protected $subject = NULL;
+
+	public function setUp() {
+		$this->subject = new \TYPO3\CMS\Belog\Domain\Model\Constraint();
+	}
+
+	public function tearDown() {
+		unset($this->subject);
+	}
+
+	/**
+	 * @test
+	 */
+	public function setManualDateStartForDateTimeSetsManualDateStart() {
+		$date = new \DateTime();
+		$this->subject->setManualDateStart($date);
+
+		$this->assertAttributeEquals($date, 'manualDateStart', $this->subject);
+	}
+
+	/**
+	 * @test
+	 */
+	public function setManualDateStartForNoArgumentSetsManualDateStart() {
+		$this->subject->setManualDateStart();
+
+		$this->assertAttributeEquals(NULL, 'manualDateStart', $this->subject);
+	}
+
+	/**
+	 * @test
+	 */
+	public function setManualDateStopForDateTimeSetsManualDateStop() {
+		$date = new \DateTime();
+		$this->subject->setManualDateStop($date);
+
+		$this->assertAttributeEquals($date, 'manualDateStop', $this->subject);
+	}
+
+	/**
+	 * @test
+	 */
+	public function setManualDateStopForNoArgumentSetsManualDateStop() {
+		$this->subject->setManualDateStop();
+
+		$this->assertAttributeEquals(NULL, 'manualDateStop', $this->subject);
+	}
+}