diff --git a/library/Icinga/Web/Form/Element/DateTimePicker.php b/library/Icinga/Web/Form/Element/DateTimePicker.php
index 1350e7f9a..529175af4 100644
--- a/library/Icinga/Web/Form/Element/DateTimePicker.php
+++ b/library/Icinga/Web/Form/Element/DateTimePicker.php
@@ -4,7 +4,6 @@
 namespace Icinga\Web\Form\Element;
 
 use DateTime;
-use Icinga\Web\Form;
 use Icinga\Web\Form\FormElement;
 use Icinga\Web\Form\Validator\DateTimeValidator;
 
@@ -126,10 +125,17 @@ class DateTimePicker extends FormElement
         if (! parent::isValid($value, $context)) {
             return false;
         }
+
         if (! $value instanceof DateTime) {
             $format = $this->local === true ? 'Y-m-d\TH:i:s' : DateTime::RFC3339;
-            $this->setValue(DateTime::createFromFormat($format, $value));
+            $dateTime = DateTime::createFromFormat($format, $value);
+            if ($dateTime === false) {
+                $dateTime = DateTime::createFromFormat(substr($format, 0, strrpos($format, ':')), $value);
+            }
+
+            $this->setValue($dateTime);
         }
+
         return true;
     }
 }
diff --git a/library/Icinga/Web/Form/Validator/DateTimeValidator.php b/library/Icinga/Web/Form/Validator/DateTimeValidator.php
index f1e22e250..576ed36f8 100644
--- a/library/Icinga/Web/Form/Validator/DateTimeValidator.php
+++ b/library/Icinga/Web/Form/Validator/DateTimeValidator.php
@@ -57,14 +57,22 @@ class DateTimeValidator extends Zend_Validate_Abstract
             $this->_error(self::INVALID_DATETIME_TYPE);
             return false;
         }
-        if (is_string($value)) {
-            $format = $this->local === true ? 'Y-m-d\TH:i:s' : DateTime::RFC3339;
+
+        if (! $value instanceof DateTime) {
+            $format = $baseFormat = $this->local === true ? 'Y-m-d\TH:i:s' : DateTime::RFC3339;
             $dateTime = DateTime::createFromFormat($format, $value);
+
+            if ($dateTime === false) {
+                $format = substr($format, 0, strrpos($format, ':'));
+                $dateTime = DateTime::createFromFormat($format, $value);
+            }
+
             if ($dateTime === false || $dateTime->format($format) !== $value) {
-                $this->_error(self::INVALID_DATETIME_FORMAT, DateTimeFactory::create()->format($format));
+                $this->_error(self::INVALID_DATETIME_FORMAT, DateTimeFactory::create()->format($baseFormat));
                 return false;
             }
         }
+
         return true;
     }
 }