Index: django/db/models/fields/__init__.py
===================================================================
--- django/db/models/fields/__init__.py	(Revision 4692)
+++ django/db/models/fields/__init__.py	(Arbeitskopie)
@@ -183,7 +183,7 @@
                 value = int(value)
             except ValueError:
                 raise ValueError("The __year lookup type requires an integer argument")
-            return ['%s-01-01 00:00:00' % value, '%s-12-31 23:59:59.999999' % value]
+            return ['%s-01-01' % value, '%s-12-31 23:59:59.999999' % value]
         raise TypeError("Field has invalid lookup: %s" % lookup_type)
 
     def has_default(self):