diff --git a/nvchecker_source/aur.py b/nvchecker_source/aur.py
index 878834f..7f2a0d6 100644
--- a/nvchecker_source/aur.py
+++ b/nvchecker_source/aur.py
@@ -1,7 +1,7 @@
 # MIT licensed
-# Copyright (c) 2013-2020 lilydjwg <lilydjwg@gmail.com>, et al.
+# Copyright (c) 2013-2020,2024 lilydjwg <lilydjwg@gmail.com>, et al.
 
-from datetime import datetime
+from datetime import datetime, timezone
 import asyncio
 from typing import Iterable, Dict, List, Tuple, Any, Optional
 
@@ -95,7 +95,8 @@ async def _run_batch_impl(
 
     version = result['Version']
     if use_last_modified:
-      version += '-' + datetime.utcfromtimestamp(result['LastModified']).strftime('%Y%m%d%H%M%S')
+      dt = datetime.fromtimestamp(result['LastModified'], timezone.utc)
+      version += '-' + dt.strftime('%Y%m%d%H%M%S')
     if strip_release and '-' in version:
       version = version.rsplit('-', 1)[0]