diff --git a/cps/db.py b/cps/db.py
index 615d2d34..f337ea4c 100755
--- a/cps/db.py
+++ b/cps/db.py
@@ -230,7 +230,7 @@ class Data(Base):
 class Books(Base):
     __tablename__ = 'books'
 
-    DEFAULT_PUBDATE = "0101-01-01"
+    DEFAULT_PUBDATE = "0101-01-01 00:00:00+00:00"
 
     id = Column(Integer, primary_key=True)
     title = Column(String)