diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 4a47997ae9d..088d375e574 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -230,9 +230,14 @@ class Field(object):
                 raise ValueError("The __year lookup type requires an integer argument")
             if settings.DATABASE_ENGINE == 'sqlite3':
                 first = '%s-01-01'
+                second = '%s-12-31 23:59:59.999999'
+            elif settings.DATABASE_ENGINE == 'oracle' and self.get_internal_type() == 'DateField':
+                first = '%s-01-01'
+                second = '%s-12-31'
             else:
                 first = '%s-01-01 00:00:00'
-            return [first % value, '%s-12-31 23:59:59.999999' % value]
+                second = '%s-12-31 23:59:59.999999'
+            return [first % value, second % value]
         raise TypeError("Field has invalid lookup: %s" % lookup_type)
 
     def has_default(self):