diff --git a/src/Bundle/ChillCalendarBundle/Entity/Calendar.php b/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
index ca3b4b25b..85130df98 100644
--- a/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
+++ b/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
@@ -16,6 +16,9 @@ use Chill\CalendarBundle\Entity\CalendarRange;
 use Chill\CalendarBundle\Entity\Invite;
 use Chill\ActivityBundle\Entity\Activity;
 use Chill\CalendarBundle\Repository\CalendarRepository;
+use Symfony\Component\Validator\Constraints\NotBlank;
+use Symfony\Component\Validator\Constraints\Range;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
 
 /**
  * @ORM\Table(name="chill_calendar.calendar")
@@ -412,4 +415,20 @@ class Calendar
     {
         return $this->getInvites(); //TODO get users of the invite
     }
+
+
+    public static function loadValidatorMetadata(ClassMetadata $metadata): void
+    {
+        $metadata->addPropertyConstraint('startDate', new NotBlank());
+        $metadata->addPropertyConstraint('startDate', new Range([
+            'min' => '2 years ago',
+            'max' => '+ 2 years',
+        ]));
+        $metadata->addPropertyConstraint('endDate', new NotBlank());
+        $metadata->addPropertyConstraint('endDate', new Range([
+            'min' => '2 years ago',
+            'max' => '+ 2 years',
+        ]));
+    }
+
 }