diff --git a/content/student/studentDBDML.php b/content/student/studentDBDML.php
index 5a32563c3..79e330c7f 100644
--- a/content/student/studentDBDML.php
+++ b/content/student/studentDBDML.php
@@ -377,11 +377,12 @@ if(!$error)
 				$error = true;
 			}
 			$datum = new datum();
-			$geb = $_POST['geburtsdatum'];
-			if(!$datum->verifyDate($geb))
+
+			$gebdatum = $_POST['geburtsdatum'];
+			if($gebdatum!='' && !$datum->checkDatum($gebdatum))
 			{
 				$return = false;
-				$errormsg = 'Datum ist nicht korrekt: '.$geb;
+				$errormsg = 'Geburtsdatum ist nicht korrekt.';
 				$error = true;
 			}
 			if(!$error)
diff --git a/include/datum.class.php b/include/datum.class.php
index e7aedd305..f09066009 100644
--- a/include/datum.class.php
+++ b/include/datum.class.php
@@ -415,22 +415,5 @@ class datum
 	{
 		return intval(substr($timestring, 0, 2)) + intval(substr($timestring, 3, 2)) / 60;
 	}
-
-	/**
-	 * Prueft das Datum
-	 * @param $date = string
-	 * @return true wenn ok, sonst false
-	 */
-	static public function verifyDate($date, $strict = true)
-	{
-		$dateTime = DateTime::createFromFormat('Y-m-d', $date);
-		if ($strict) {
-			$errors = DateTime::getLastErrors();
-			if (!empty($errors['warning_count'])) {
-				return false;
-			}
-		}
-		return $dateTime !== false;
-	}
 }
 ?>