diff --git a/litstudy/sources/csv.py b/litstudy/sources/csv.py
index 243b9c0..a4d18f3 100644
--- a/litstudy/sources/csv.py
+++ b/litstudy/sources/csv.py
@@ -116,7 +116,7 @@ def publication_date(self):
 
         for fmt in formats:
             try:
-                return datetime.strptime(text, fmt)
+                return datetime.datetime.strptime(text, fmt)
             except Exception:
                 pass