fix date

shared/models/main.py

@@ -470,7 +470,7 @@ class MainArticlesPageMixin(
         )
         first_day_of_target_month = target_date.replace(day=1)
 
-        filter = models.Q(date__gte=first_day_of_target_month) & search_filter
+        filter = models.Q(timestamp__gte=first_day_of_target_month) & search_filter
 
         sorted_article_qs = self.get_base_shared_articles_query(filter)