diff --git a/content/student/studentoverlay.js.php b/content/student/studentoverlay.js.php
index e5750ada8..4e1e08480 100644
--- a/content/student/studentoverlay.js.php
+++ b/content/student/studentoverlay.js.php
@@ -1571,7 +1571,7 @@ function StudentRolleSpeichern(dialog, studiensemester_old, ausbildungssemester_
 	req.add('studiensemester_old', studiensemester_old);
 	req.add('ausbildungssemester_old', ausbildungssemester_old);
 	req.add('ausbildungssemester', ausbildungssemester);
-	req.add('datum', datum);
+	req.add('datum', ConvertDateToISO(datum));
 	req.add('orgform_kurzbz', orgform_kurzbz);
 
 	var response = req.executePOST();
@@ -4215,4 +4215,4 @@ function StudentReihungstestDropDownSelect()
 {
 	if(document.getElementById('student-prestudent-textbox-anmeldungreihungstest').value=='')
 		StudentAnmeldungreihungstestHeute();
-}
\ No newline at end of file
+}