fix: Use timezone data not native datetime

src/fellchensammlung/migrations/0011_alter_adoptionnotice_created_at_and_more.py

@@ -0,0 +1,24 @@
+# Generated by Django 5.1.1 on 2024-10-29 10:44
+
+import django.utils.timezone
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('fellchensammlung', '0010_timestamp'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='adoptionnotice',
+            name='created_at',
+            field=models.DateField(default=django.utils.timezone.now, verbose_name='Erstellt am'),
+        ),
+        migrations.AlterField(
+            model_name='adoptionnotice',
+            name='last_checked',
+            field=models.DateTimeField(default=django.utils.timezone.now, verbose_name='Zuletzt überprüft am'),
+        ),
+    ]

src/fellchensammlung/tasks.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from django.utils import timezone
 from notfellchen.celery import app as celery_app
 from .tools.admin import clean_locations, deactivate_unchecked_adoption_notices
 from .tools.misc import healthcheck_ok
@@ -8,9 +8,9 @@ from .models import Location, AdoptionNotice, Timestamp
 def set_timestamp(key: str):
     try:
         ts = Timestamp.objects.get(key=key)
-        ts.timestamp = datetime.now()
+        ts.timestamp = timezone.now()
     except Timestamp.DoesNotExist:
-        Timestamp.objects.create(key=key, timestamp=datetime.now())
+        Timestamp.objects.create(key=key, timestamp=timezone.now())
 
 
 @celery_app.task(name="admin.clean_locations")