small bugfix based on changed structure

src/backend/database.py

@@ -723,15 +723,16 @@ class Database:
             newDate (str): the new date
             dauerapp (bool, optional): if the apparat was changed to dauerapparat. Defaults to False.
         """
-        date = datetime.datetime.strptime(newDate, "%d.%m.%Y").strftime("%Y-%m-%d")
+
         if dauerapp:
             self.query_db(
                 "UPDATE semesterapparat SET verlängerung_bis=?, dauerapp=? WHERE appnr=?",
-                (date, dauerapp, app_id),
+                (newDate, dauerapp, app_id),
             )
         else:
             self.query_db(
-                "UPDATE semesterapparat SET endsemester=? WHERE appnr=?", (date, app_id)
+                "UPDATE semesterapparat SET verlängerung_bis=? WHERE appnr=?",
+                (newDate, app_id),
             )
 
     def getApparatId(self, apparat_name) -> Optional[int]: