diff --git a/auditlog/mixins.py b/auditlog/mixins.py
index 1936763..efa1ab5 100644
--- a/auditlog/mixins.py
+++ b/auditlog/mixins.py
@@ -2,6 +2,7 @@ import json
 
 from django import urls as urlresolvers
 from django.conf import settings
+from django.contrib import admin
 from django.core.exceptions import FieldDoesNotExist
 from django.forms.utils import pretty_name
 from django.urls.exceptions import NoReverseMatch
@@ -16,11 +17,11 @@ MAX = 75
 
 
 class LogEntryAdminMixin:
+    @admin.display(description="Created")
     def created(self, obj):
-        return localtime(obj.timestamp).strftime("%Y-%m-%d %H:%M:%S")
-
-    created.short_description = "Created"
+        return localtime(obj.timestamp)
 
+    @admin.display(description="User")
     def user_url(self, obj):
         if obj.actor:
             app_label, model = settings.AUTH_USER_MODEL.split(".")
@@ -33,8 +34,7 @@ class LogEntryAdminMixin:
 
         return "system"
 
-    user_url.short_description = "User"
-
+    @admin.display(description="Resource")
     def resource_url(self, obj):
         app_label, model = obj.content_type.app_label, obj.content_type.model
         viewname = f"admin:{app_label}_{model}_change"
@@ -48,8 +48,7 @@ class LogEntryAdminMixin:
                 '<a href="{}">{} - {}</a>', link, obj.content_type, obj.object_repr
             )
 
-    resource_url.short_description = "Resource"
-
+    @admin.display(description="Changes")
     def msg_short(self, obj):
         if obj.action == LogEntry.Action.DELETE:
             return ""  # delete
@@ -61,8 +60,7 @@ class LogEntryAdminMixin:
             fields = fields[:i] + " .."
         return "%d change%s: %s" % (len(changes), s, fields)
 
-    msg_short.short_description = "Changes"
-
+    @admin.display(description="Changes")
     def msg(self, obj):
         changes = json.loads(obj.changes)
 
@@ -114,8 +112,6 @@ class LogEntryAdminMixin:
 
         return mark_safe("".join(msg))
 
-    msg.short_description = "Changes"
-
     def _format_header(self, *labels):
         return format_html(
             "".join(["<tr>", "<th>{}</th>" * len(labels), "</tr>"]), *labels
diff --git a/auditlog_tests/tests.py b/auditlog_tests/tests.py
index 0adb710..9205902 100644
--- a/auditlog_tests/tests.py
+++ b/auditlog_tests/tests.py
@@ -1294,7 +1294,8 @@ class AdminPanelTest(TestCase):
             ("Asia/Kathmandu", "2022-08-01 17:45:00"),
         ]:
             with self.settings(TIME_ZONE=tz):
-                self.assertEqual(self.admin.created(log_entry), timestamp)
+                created = self.admin.created(log_entry)
+                self.assertEqual(created.strftime("%Y-%m-%d %H:%M:%S"), timestamp)
 
 
 class DiffMsgTest(TestCase):