diff --git a/app/item/views.py b/app/item/views.py
index f4b5b20..a65ccf7 100644
--- a/app/item/views.py
+++ b/app/item/views.py
@@ -49,7 +49,7 @@ def get_byline(week):
 
 def get_weeks(archive):
     weeks = sorted(set(archive.values_list('year', 'week')))
-    weeks = [datetime.strptime('%s-W%s-1' % w, "%Y-W%W-%w").strftime('%Y-%m-%d') for w in weeks]
+    weeks = [datetime.strptime('%s-W%s-1' % w, "%Y-W%U-%w").strftime('%Y-%m-%d') for w in weeks]
     weeks = [{
         'date': week,
         'year': week.split('-')[0],