changes to the mahnungen_admin

Web/app.py

@@ -3826,6 +3826,7 @@ def mahnungen_admin():
             return val
 
     current_time = datetime.datetime.now(ZoneInfo("Europe/Berlin"))
+    current_time_naive = current_time.replace(tzinfo=None)
     client = None
 
     try:
@@ -3836,7 +3837,6 @@ def mahnungen_admin():
         users_col = db['users']
         student_cards_col = db['student_cards']
 
-        # Überfällige Ausleihen abrufen (Status 'active' und DueDate in der Vergangenheit)
         overdue_records = list(ausleihungen_col.find({
             'Status': 'active',
             'DueDate': {'$lt': current_time}
@@ -3845,7 +3845,6 @@ def mahnungen_admin():
         overdue_list = []
 
         if overdue_records:
-            # Bulk-Lookups zur Vermeidung von N+1 Queries
             item_ids = []
             for r in overdue_records:
                 i_id = r.get('Item')
@@ -3883,7 +3882,6 @@ def mahnungen_admin():
                 if ausweis_id:
                     class_map[str(ausweis_id).strip().lower()] = dec_cls
 
-            # Datenaufbereitung für das Template
             for record in overdue_records:
                 item_id = str(record.get('Item') or '')
                 item_doc = item_map.get(item_id, {})
@@ -3908,7 +3906,13 @@ def mahnungen_admin():
                 )
 
                 due_date_obj = record.get('DueDate')
-                days_overdue = (current_time - due_date_obj).days if due_date_obj else 0
+
+                if due_date_obj:
+                    due_date_naive = due_date_obj.replace(tzinfo=None) if due_date_obj.tzinfo else due_date_obj
+                    days_overdue = (current_time_naive - due_date_naive).days
+                else:
+                    days_overdue = 0
+
                 is_blocked = user_block_map.get(raw_user, False)
 
                 overdue_list.append({