better time usings

src/server/services/download_service.py

@@ -11,7 +11,7 @@ import json
 import uuid
 from collections import deque
 from concurrent.futures import ThreadPoolExecutor
-from datetime import datetime
+from datetime import datetime, timezone
 from pathlib import Path
 from typing import Callable, Dict, List, Optional
 
@@ -183,7 +183,7 @@ class DownloadService:
                     item.model_dump(mode="json")
                     for item in self._failed_items
                 ],
-                "timestamp": datetime.utcnow().isoformat(),
+                "timestamp": datetime.now(timezone.utc).isoformat(),
             }
             
             with open(self._persistence_path, "w", encoding="utf-8") as f:
@@ -225,7 +225,7 @@ class DownloadService:
                     episode=episode,
                     status=DownloadStatus.PENDING,
                     priority=priority,
-                    added_at=datetime.utcnow(),
+                    added_at=datetime.now(timezone.utc),
                 )
                 
                 # Insert based on priority
@@ -284,7 +284,7 @@ class DownloadService:
                 if item_id in self._active_downloads:
                     item = self._active_downloads[item_id]
                     item.status = DownloadStatus.CANCELLED
-                    item.completed_at = datetime.utcnow()
+                    item.completed_at = datetime.now(timezone.utc)
                     self._failed_items.append(item)
                     del self._active_downloads[item_id]
                     removed_ids.append(item_id)
@@ -673,7 +673,7 @@ class DownloadService:
         try:
             # Update status
             item.status = DownloadStatus.DOWNLOADING
-            item.started_at = datetime.utcnow()
+            item.started_at = datetime.now(timezone.utc)
             self._active_downloads[item.id] = item
             
             logger.info(
@@ -715,7 +715,7 @@ class DownloadService:
             # Handle result
             if success:
                 item.status = DownloadStatus.COMPLETED
-                item.completed_at = datetime.utcnow()
+                item.completed_at = datetime.now(timezone.utc)
                 
                 # Track downloaded size
                 if item.progress and item.progress.downloaded_mb:
@@ -757,7 +757,7 @@ class DownloadService:
         except Exception as e:
             # Handle failure
             item.status = DownloadStatus.FAILED
-            item.completed_at = datetime.utcnow()
+            item.completed_at = datetime.now(timezone.utc)
             item.error = str(e)
             self._failed_items.append(item)