diff --git a/library/Icinga/Web/Form.php b/library/Icinga/Web/Form.php
index 2fc54b997..2357cddbc 100644
--- a/library/Icinga/Web/Form.php
+++ b/library/Icinga/Web/Form.php
@@ -94,6 +94,22 @@ abstract class Form extends \Zend_Form
      */
     abstract protected function create();
 
+    /**
+     * Method called before validation
+     */
+    protected function preValid(array $data)
+    {
+    }
+
+    /**
+     * Method called after validation
+     * @param array $data
+     * @param bool  &$isValid
+     */
+    protected function postValid(array $data, &$isValid)
+    {
+    }
+
     /**
      * Setter for request
      * @param \Zend_Controller_Request_Abstract $request The request object of a session
@@ -139,20 +155,24 @@ abstract class Form extends \Zend_Form
      */
     public function isValid($data)
     {
-        $check = null;
+        $checkData = null;
 
         // Elements must be there to validate
         $this->buildForm();
 
         if ($data === null) {
-            $check = $this->getRequest()->getParams();
+            $checkData = $this->getRequest()->getParams();
         } elseif ($data instanceof \Zend_Controller_Request_Abstract) {
-            $check = $data->getParams();
+            $checkData = $data->getParams();
         } else {
-            $check = $data;
+            $checkData = $data;
         }
 
-        return parent::isValid($check);
+        $this->preValid($checkData);
+        $checkValue = parent::isValid($checkData);
+        $this->postValid($checkData, $checkValue);
+
+        return $checkValue;
     }
 
     /**
diff --git a/modules/monitoring/application/controllers/CommandController.php b/modules/monitoring/application/controllers/CommandController.php
index 8617e504e..68b2fcecf 100644
--- a/modules/monitoring/application/controllers/CommandController.php
+++ b/modules/monitoring/application/controllers/CommandController.php
@@ -1,4 +1,6 @@
 <?php
+// @codingStandardsIgnoreStart
+
 // {{{ICINGA_LICENSE_HEADER}}}
 /**
  * This file is part of Icinga 2 Web.
@@ -26,9 +28,11 @@
  */
 // {{{ICINGA_LICENSE_HEADER}}}
 
+use Icinga\Application\Benchmark;
 use Icinga\Backend;
 use Icinga\Application\Config;
 use Icinga\Authentication\Manager;
+use Icinga\Web\Form;
 use Icinga\Web\ModuleActionController;
 use Icinga\Protocol\Commandpipe\Comment;
 use Icinga\Protocol\Commandpipe\CommandPipe;
@@ -55,9 +59,62 @@ class Monitoring_CommandController extends ModuleActionController
     const DEFAULT_VIEW_SCRIPT = 'renderform';
 
     /**
-     * @var \Icinga\Protocol\Commandpipe\CommandPipe
+     * Command target
+     * @var CommandPipe
      */
-    public $target;
+    private $target;
+
+    /**
+     * Current form working on
+     * @var Form
+     */
+    private $form;
+
+    /**
+     * Setter for form
+     * @param Form $form
+     */
+    public function setForm($form)
+    {
+        $this->form = $form;
+    }
+
+    /**
+     * Getter for form
+     * @return Form
+     */
+    public function getForm()
+    {
+        return $this->form;
+    }
+
+    /**
+     * Test if we have a valid form object
+     * @return bool
+     */
+    public function issetForm()
+    {
+        return $this->getForm() !== null && ($this->getForm() instanceof Form);
+    }
+
+    /**
+     * Post dispatch method
+     *
+     * When we have a form put it into the view
+     */
+    public function postDispatch()
+    {
+        if ($this->issetForm()) {
+            if ($this->getRequest()->isPost() && $this->getForm()->isValid(null) === true) {
+                $this->_helper->viewRenderer->setNoRender(true);
+                $this->_helper->layout()->disableLayout();
+            }
+            $this->view->form = $this->getForm();
+        }
+
+        parent::postDispatch();
+    }
+
 
     /**
      * Controller configuration
@@ -66,9 +123,6 @@ class Monitoring_CommandController extends ModuleActionController
     public function init()
     {
         if ($this->_request->isPost()) {
-            // Save time and memory. We're only working on post
-            $this->_helper->viewRenderer->setNoRender(true);
-            $this->_helper->layout()->disableLayout();
 
             $instance = $this->_request->getPost("instance");
 
@@ -152,9 +206,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Disable active checks'));
         $form->addNote(t('Disable active checks for this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -169,9 +223,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Enable active checks'));
         $form->addNote(t('Enable active checks for this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -185,9 +239,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form = new RescheduleNextCheck();
         $form->setRequest($this->getRequest());
 
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -204,9 +258,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setType($type);
 
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -221,9 +275,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Stop obsessing'));
         $form->addNote(t('Stop obsessing over this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -238,9 +292,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Start obsessing'));
         $form->addNote(t('Start obsessing over this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -255,9 +309,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Stop accepting passive checks'));
         $form->addNote(t('Passive checks for this object will be omitted.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -272,9 +326,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Start accepting passive checks'));
         $form->addNote(t('Passive checks for this object will be accepted.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -289,9 +343,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Disable notifications'));
         $form->addNote(t('Notifications for this object will be disabled.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -306,9 +360,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Enable notifications'));
         $form->addNote(t('Notifications for this object will be enabled.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -321,9 +375,9 @@ class Monitoring_CommandController extends ModuleActionController
     {
         $form = new CustomNotification();
         $form->setRequest($this->getRequest());
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -337,9 +391,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form = new ScheduleDowntime();
         $form->setRequest($this->getRequest());
         $form->setWithChildren(false);
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -353,9 +407,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form = new ScheduleDowntime();
         $form->setRequest($this->getRequest());
         $form->setWithChildren(true);
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -370,9 +424,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Remove downtime(s)'));
         $form->addNote(t('Remove downtime(s) from this host and its services.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -387,9 +441,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Disable notifications'));
         $form->addNote(t('Notifications for this host and its services will be disabled.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -404,9 +458,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Enable notifications'));
         $form->addNote(t('Notifications for this host and its services will be enabled.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -422,9 +476,9 @@ class Monitoring_CommandController extends ModuleActionController
 
         $form->setWithChildren(true);
 
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -439,9 +493,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Disable active checks'));
         $form->addNote(t('Disable active checks for this host and its services.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -456,9 +510,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Enable active checks'));
         $form->addNote(t('Enable active checks for this host and its services.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -473,9 +527,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Disable event handler'));
         $form->addNote(t('Disable event handler for this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -490,9 +544,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Enable event handler'));
         $form->addNote(t('Enable event handler for this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -507,9 +561,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Disable flapping detection'));
         $form->addNote(t('Disable flapping detection for this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -524,9 +578,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Enable flapping detection'));
         $form->addNote(t('Enable flapping detection for this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -540,9 +594,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form = new CommentForm();
         $form->setRequest($this->getRequest());
 
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -557,9 +611,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Reset attributes'));
         $form->addNote(t('Reset modified attributes to its default.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -573,9 +627,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form = new Acknowledge();
         $form->setRequest($this->getRequest());
 
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -590,9 +644,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setRequest($this->getRequest());
         $form->setSubmitLabel(t('Remove problem acknowledgement'));
         $form->addNote(t('Remove problem acknowledgement for this object.'));
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -606,9 +660,9 @@ class Monitoring_CommandController extends ModuleActionController
         $form = new DelayNotification();
         $form->setRequest($this->getRequest());
 
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
@@ -627,10 +681,12 @@ class Monitoring_CommandController extends ModuleActionController
         $form->setFieldLabel(t('Downtime id'));
         $form->addNote(t('Delete a single downtime with the id shown above'));
 
-        $this->view->form = $form;
+        $this->setForm($form);
 
-        if ($form->isValid(null) && $this->getRequest()->isPost()) {
+        if ($this->getRequest()->isPost() && $form->isValid(null)) {
             throw new \Icinga\Exception\ProgrammingError('Command sender not implemented: '. __FUNCTION__);
         }
     }
 }
+
+// @codingStandardsIgnoreStop
\ No newline at end of file
diff --git a/modules/monitoring/application/forms/Command/AbstractCommand.php b/modules/monitoring/application/forms/Command/AbstractCommand.php
index 6b7549e06..7991ab4f2 100644
--- a/modules/monitoring/application/forms/Command/AbstractCommand.php
+++ b/modules/monitoring/application/forms/Command/AbstractCommand.php
@@ -31,12 +31,23 @@ namespace Monitoring\Form\Command;
 use Icinga\Web\Form;
 use Icinga\Web\Form\Element\Note;
 use \Zend_Form_Element_Hidden;
+use \Zend_Validate_Date;
 
 /**
  * Class AbstractCommand
  */
 abstract class AbstractCommand extends Form
 {
+    /**
+     * Default date format
+     */
+    const DEFAULT_DATE_FORMAT = 'Y-m-d H:i:s';
+
+    /**
+     * Default format for validation
+     */
+    const DEFAULT_DATE_VALIDATION = 'yyyy-MM-dd hh:ii:ss';
+
     /**
      * Label for submit button
      *
@@ -196,9 +207,10 @@ abstract class AbstractCommand extends Form
 
         $authorField = new Zend_Form_Element_Hidden(
             array(
-                'name'  => 'author',
-                'value' => $authorName,
-                'label' => t('Author name')
+                'name'     => 'author',
+                'label'    => t('Author name'),
+                'value'    => $authorName,
+                'required' => true
             )
         );
 
@@ -213,4 +225,34 @@ abstract class AbstractCommand extends Form
 
         return $authorField;
     }
+
+    /**
+     * Getter for date format
+     * TODO(mh): Should be user preferences
+     * @return string
+     */
+    protected function getDateFormat()
+    {
+        return self::DEFAULT_DATE_FORMAT;
+    }
+
+    /**
+     * Getter for date validation format
+     * @return string
+     */
+    protected function getDateValidationFormat()
+    {
+        return self::DEFAULT_DATE_VALIDATION;
+    }
+
+    /**
+     * Create a new date validator
+     * @return Zend_Validate_Date
+     */
+    protected function createDateTimeValidator()
+    {
+        $validator = new Zend_Validate_Date();
+        $validator->setFormat($this->getDateValidationFormat());
+        return $validator;
+    }
 }
diff --git a/modules/monitoring/application/forms/Command/Acknowledge.php b/modules/monitoring/application/forms/Command/Acknowledge.php
index 7e6863366..cbd345c55 100644
--- a/modules/monitoring/application/forms/Command/Acknowledge.php
+++ b/modules/monitoring/application/forms/Command/Acknowledge.php
@@ -50,8 +50,9 @@ class Acknowledge extends AbstractCommand
             'textarea',
             'comment',
             array(
-                'label' => t('Comment'),
-                'rows'  => 4
+                'label'    => t('Comment'),
+                'rows'     => 4,
+                'required' => true
             )
         );
 
@@ -68,8 +69,7 @@ class Acknowledge extends AbstractCommand
             'checkbox',
             'expire',
             array(
-                'label'    => t('Use expire time'),
-                'value'    => false
+                'label'    => t('Use expire time')
             )
         );
 
@@ -81,7 +81,7 @@ class Acknowledge extends AbstractCommand
             array(
                 'name'  => 'expiretime',
                 'label' => t('Expire time'),
-                'value' => $now->format('Y-m-d H:i:s')
+                'value' => $now->format($this->getDateFormat())
             )
         );
 
@@ -128,4 +128,17 @@ class Acknowledge extends AbstractCommand
 
         parent::create();
     }
+
+    /**
+     * Add validator for dependent fields
+     * @param array $data
+     */
+    protected function preValid(array $data)
+    {
+        if (isset($data['expire']) && $data['expire'] === '1') {
+            $expireTime = $this->getElement('expiretime');
+            $expireTime->setRequired(true);
+            $expireTime->addValidator($this->createDateTimeValidator(), true);
+        }
+    }
 }
diff --git a/modules/monitoring/application/forms/Command/Comment.php b/modules/monitoring/application/forms/Command/Comment.php
index 7c265582d..961fb66db 100644
--- a/modules/monitoring/application/forms/Command/Comment.php
+++ b/modules/monitoring/application/forms/Command/Comment.php
@@ -42,8 +42,9 @@ class Comment extends AbstractCommand
             'textarea',
             'comment',
             array(
-                'label' => t('Comment'),
-                'rows'  => 4
+                'label'    => t('Comment'),
+                'rows'     => 4,
+                'required' => true
             )
         );
 
diff --git a/modules/monitoring/application/forms/Command/Confirmation.php b/modules/monitoring/application/forms/Command/Confirmation.php
index 0f555da2b..abea66669 100644
--- a/modules/monitoring/application/forms/Command/Confirmation.php
+++ b/modules/monitoring/application/forms/Command/Confirmation.php
@@ -31,7 +31,7 @@ namespace Monitoring\Form\Command;
 /**
  * Simple confirmation form
  *
- * Exist to make the abstract form concrete.
+ * Exist to make the abstract available as concrete class
  */
 class Confirmation extends AbstractCommand
 {
diff --git a/modules/monitoring/application/forms/Command/ConfirmationWithIdentifier.php b/modules/monitoring/application/forms/Command/ConfirmationWithIdentifier.php
index 94b5e5c75..e877af941 100644
--- a/modules/monitoring/application/forms/Command/ConfirmationWithIdentifier.php
+++ b/modules/monitoring/application/forms/Command/ConfirmationWithIdentifier.php
@@ -96,6 +96,13 @@ class ConfirmationWithIdentifier extends Confirmation
         $fieldLabel = $this->getFieldLabel();
 
         $hiddenField = new Zend_Form_Element_Hidden($this->getFieldName());
+        $hiddenField->setValue($value);
+        $hiddenField->setRequired(true);
+        $hiddenField->addValidator(
+            'digits',
+            true
+        );
+
         $hiddenField->removeDecorator('Label');
 
         $hiddenField->addDecorator(
diff --git a/modules/monitoring/application/forms/Command/CustomNotification.php b/modules/monitoring/application/forms/Command/CustomNotification.php
index 0cf1a344b..70f56eb9c 100644
--- a/modules/monitoring/application/forms/Command/CustomNotification.php
+++ b/modules/monitoring/application/forms/Command/CustomNotification.php
@@ -47,8 +47,9 @@ class CustomNotification extends AbstractCommand
             'textarea',
             'comment',
             array(
-                'label' => t('Comment'),
-                'rows'  => 4
+                'label'    => t('Comment'),
+                'rows'     => 4,
+                'required' => true
             )
         );
 
diff --git a/modules/monitoring/application/forms/Command/DelayNotification.php b/modules/monitoring/application/forms/Command/DelayNotification.php
index 5af1ccc13..deb1d007b 100644
--- a/modules/monitoring/application/forms/Command/DelayNotification.php
+++ b/modules/monitoring/application/forms/Command/DelayNotification.php
@@ -33,6 +33,10 @@ namespace Monitoring\Form\Command;
  */
 class DelayNotification extends AbstractCommand
 {
+    /**
+     * Biggest value for minutes
+     */
+    const MAX_VALUE = 1440;
     /**
      * Interface method to build the form
      * @see Form::create()
@@ -43,9 +47,20 @@ class DelayNotification extends AbstractCommand
             'text',
             'minutes',
             array(
-                'label' => t('Notification delay'),
-                'style' => 'width: 80px;',
-                'value' => 0
+                'label'    => t('Notification delay'),
+                'style'    => 'width: 80px;',
+                'value'    => 0,
+                'required' => true,
+                'validators' => array(
+                    array(
+                        'between',
+                        true,
+                        array(
+                            'min' => 1,
+                            'max' => self::MAX_VALUE
+                        )
+                    )
+                )
             )
         );
 
diff --git a/modules/monitoring/application/forms/Command/RescheduleNextCheck.php b/modules/monitoring/application/forms/Command/RescheduleNextCheck.php
index fbc48f1b1..bec8f8c0e 100644
--- a/modules/monitoring/application/forms/Command/RescheduleNextCheck.php
+++ b/modules/monitoring/application/forms/Command/RescheduleNextCheck.php
@@ -54,6 +54,9 @@ class RescheduleNextCheck extends WithChildrenCommand
             )
         );
 
+        $dateElement->setRequired(true);
+        $dateElement->addValidator($this->createDateTimeValidator(), true);
+
         $this->addElement($dateElement);
 
         $checkBox = new Zend_Form_Element_Checkbox(
diff --git a/modules/monitoring/application/forms/Command/ScheduleDowntime.php b/modules/monitoring/application/forms/Command/ScheduleDowntime.php
index 0bf006de6..c0ef55736 100644
--- a/modules/monitoring/application/forms/Command/ScheduleDowntime.php
+++ b/modules/monitoring/application/forms/Command/ScheduleDowntime.php
@@ -32,6 +32,8 @@ use Icinga\Web\Form\Element\DateTime;
 use \DateTime as PhpDateTime;
 use \DateInterval;
 use \Zend_Form_Element_Text;
+use \Zend_Validate_GreaterThan;
+use \Zend_Validate_Digits;
 
 /**
  * Form for any ScheduleDowntime command
@@ -44,12 +46,6 @@ class ScheduleDowntime extends WithChildrenCommand
      */
     const DEFAULT_ENDTIME_INTERVAL = 'PT1H';
 
-    /**
-     * Default time format
-     * TODO(mh): Should be configurable on a central place (#4424)
-     */
-    const DEFAULT_DATE_FORMAT = 'Y-m-d H:i:s';
-
     /**
      * Type constant for fixed downtimes
      */
@@ -69,11 +65,11 @@ class ScheduleDowntime extends WithChildrenCommand
         $out = array();
 
         $dateTimeObject = new PhpDateTime();
-        $out[] = $dateTimeObject->format(self::DEFAULT_DATE_FORMAT);
+        $out[] = $dateTimeObject->format($this->getDateFormat());
 
         $dateInterval = new DateInterval(self::DEFAULT_ENDTIME_INTERVAL);
         $dateTimeObject->add($dateInterval);
-        $out[] = $dateTimeObject->format(self::DEFAULT_DATE_FORMAT);
+        $out[] = $dateTimeObject->format($this->getDateFormat());
 
         return $out;
     }
@@ -102,8 +98,9 @@ class ScheduleDowntime extends WithChildrenCommand
             'textarea',
             'comment',
             array(
-                'label' => t('Comment'),
-                'rows'  => 4
+                'label'    => t('Comment'),
+                'rows'     => 4,
+                'required' => true
             )
         );
 
@@ -111,7 +108,22 @@ class ScheduleDowntime extends WithChildrenCommand
             'text',
             'triggered',
             array(
-                'label' => t('Triggered by')
+                'label'      => t('Triggered by'),
+                'value'      => 0,
+                'required'   => true,
+                'validators' => array(
+                    array(
+                        'Digits',
+                        true
+                    ),
+                    array(
+                        'GreaterThan',
+                        true,
+                        array(
+                            'min' => -1
+                        )
+                    )
+                )
             )
         );
 
@@ -124,6 +136,8 @@ class ScheduleDowntime extends WithChildrenCommand
                 'value' => $timestampStart
             )
         );
+        $dateTimeStart->setRequired(true);
+        $dateTimeStart->addValidator($this->createDateTimeValidator(), true);
 
         $dateTimeEnd = new DateTime(
             array(
@@ -132,6 +146,8 @@ class ScheduleDowntime extends WithChildrenCommand
                 'value' => $timestampEnd
             )
         );
+        $dateTimeEnd->setRequired(true);
+        $dateTimeEnd->addValidator($this->createDateTimeValidator(), true);
 
         $this->addElements(array($dateTimeStart, $dateTimeEnd));
 
@@ -140,7 +156,17 @@ class ScheduleDowntime extends WithChildrenCommand
             'type',
             array(
                 'label'        => t('Downtime type'),
-                'multiOptions' => $this->getDowntimeTypeOptions()
+                'multiOptions' => $this->getDowntimeTypeOptions(),
+                'required'     => true,
+                'validators'   => array(
+                    array(
+                        'InArray',
+                        true,
+                        array(
+                            array_keys($this->getDowntimeTypeOptions())
+                        )
+                    )
+                )
             )
         );
 
@@ -188,6 +214,19 @@ class ScheduleDowntime extends WithChildrenCommand
                         0 => t('Do nothing with child objects'),
                         1 => t('Schedule triggered downtime for all child objects'),
                         2 => t('Schedule non-triggered downtime for all child objects')
+                    ),
+                    'validators'   => array(
+                        array(
+                            'Digits',
+                            true
+                        ),
+                        array(
+                            'InArray',
+                            true,
+                            array(
+                                array(0, 1, 2)
+                            )
+                        )
                     )
                 )
             );
@@ -199,4 +238,29 @@ class ScheduleDowntime extends WithChildrenCommand
 
         parent::create();
     }
+
+    /**
+     * Change validators at runtime
+     * @param array $data
+     */
+    protected function preValid(array $data)
+    {
+        /*
+         * Other values needed when downtime type change to flexible
+         */
+        if (isset($data['type']) && $data['type'] === self::TYPE_FLEXIBLE) {
+            $greaterThanValidator = new Zend_Validate_GreaterThan(-1);
+            $digitsValidator = new Zend_Validate_Digits();
+
+            $hours = $this->getElement('hours');
+            $hours->setRequired(true);
+            $hours->addValidator($digitsValidator, true);
+            $hours->addValidator($greaterThanValidator, true);
+
+            $minutes = $this->getElement('minutes');
+            $minutes->setRequired(true);
+            $minutes->addValidator($digitsValidator, true);
+            $minutes->addValidator($greaterThanValidator, true);
+        }
+    }
 }
diff --git a/modules/monitoring/application/forms/Command/SubmitPassiveCheckResult.php b/modules/monitoring/application/forms/Command/SubmitPassiveCheckResult.php
index 676388451..122babfbf 100644
--- a/modules/monitoring/application/forms/Command/SubmitPassiveCheckResult.php
+++ b/modules/monitoring/application/forms/Command/SubmitPassiveCheckResult.php
@@ -122,7 +122,21 @@ class SubmitPassiveCheckResult extends AbstractCommand
             'pluginstate',
             array(
                 'label'        => t('Plugin state'),
-                'multiOptions' => $this->getOptions()
+                'multiOptions' => $this->getOptions(),
+                'required'     => true,
+                'validators'   => array(
+                    array(
+                        'Digits',
+                        true
+                    ),
+                    array(
+                        'InArray',
+                        true,
+                        array(
+                            array_keys($this->getOptions())
+                        )
+                    )
+                )
             )
         );
 
@@ -130,8 +144,9 @@ class SubmitPassiveCheckResult extends AbstractCommand
             'textarea',
             'checkoutput',
             array(
-                'label' => t('Check output'),
-                'rows'  => 2
+                'label'    => t('Check output'),
+                'rows'     => 2,
+                'required' => true
             )
         );