diff --git a/personal_data/fetchers/youtube.py b/personal_data/fetchers/youtube.py
index acd22a1..e067f64 100644
--- a/personal_data/fetchers/youtube.py
+++ b/personal_data/fetchers/youtube.py
@@ -3,6 +3,7 @@ import json
 import logging
 import subprocess
 from dataclasses import dataclass
+from typing import ClassVar
 
 from personal_data.data import DeduplicateMode, Scraper
 from personal_data.secrets import YOUTUBE_AUTH
@@ -34,7 +35,6 @@ def scrape(watch_history: bool) -> list[dict[str, str]]:
             url,
         ]
 
-    print(ytdlp_args)
     result = subprocess.run(
         ytdlp_args,
         capture_output=True,
@@ -42,22 +42,20 @@ def scrape(watch_history: bool) -> list[dict[str, str]]:
     )
 
     if result.returncode != 0:
-        raise RuntimeError(
-            f'Non-zero returncode in command: {result.returncode}\n\n{result.stderr}',
-        )
+        message = 'Non-zero returncode in command: ' + str(result.returncode) + "\n\n" + result.stderr
+        raise RuntimeError(message)
 
-    print(result.stderr)
-    print(result.stdout)
 
     output = []
     for line in result.stdout.splitlines():
         data = json.loads(line)
         if watch_history:
-            if 'thumbnails' in data and data['thumbnails']:
+            if data.get('thumbnails'):
                 data['thumbnail'] = data['thumbnails'][-1]['url']
-            if 'timestamp' in data:
+            if data.get('timestamp'):
                 data['watch_datetime'] = datetime.datetime.fromtimestamp(
                     int(data['timestamp']),
+                    tz=datetime.timezone.utc
                 ).isoformat()
         else:
             data['thumbnail'] = data['thumbnails'][-1]['url']
@@ -70,7 +68,7 @@ def scrape(watch_history: bool) -> list[dict[str, str]]:
 class YoutubeFavoritesScraper(Scraper):
     dataset_name: str = 'youtube_favorites'
     deduplicate_mode: DeduplicateMode = DeduplicateMode.BY_ALL_COLUMNS
-    deduplicate_ignore_columns = []
+    deduplicate_ignore_columns: ClassVar[list[str]] = []
 
     def scrape(self) -> list[dict]:
         yield from scrape(watch_history=False)
@@ -80,7 +78,7 @@ class YoutubeFavoritesScraper(Scraper):
 class YoutubeWatchHistoryScraper(Scraper):
     dataset_name: str = 'youtube_watch_history'
     deduplicate_mode: DeduplicateMode = DeduplicateMode.BY_ALL_COLUMNS
-    deduplicate_ignore_columns = []
+    deduplicate_ignore_columns: ClassVar[list[str]] = []
 
     def scrape(self) -> list[dict]:
         yield from scrape(watch_history=True)