diff --git a/django/db/backends/ado_mssql/base.py b/django/db/backends/ado_mssql/base.py
index 33800980a8..17c83195c5 100644
--- a/django/db/backends/ado_mssql/base.py
+++ b/django/db/backends/ado_mssql/base.py
@@ -89,7 +89,7 @@ class DatabaseWrapper(local):
 
 allows_group_by_ordinal = True
 allows_unique_and_pk = True
-returns_dates_as_strings = False
+needs_datetime_string_cast = True
 supports_constraints = True
 uses_case_insensitive_names = False
 
diff --git a/django/db/backends/mysql/base.py b/django/db/backends/mysql/base.py
index e5756dc4b0..38a385208a 100644
--- a/django/db/backends/mysql/base.py
+++ b/django/db/backends/mysql/base.py
@@ -132,7 +132,7 @@ class DatabaseWrapper(local):
 
 allows_group_by_ordinal = True
 allows_unique_and_pk = True
-returns_dates_as_strings = True     # MySQLdb requires a typecast for dates
+needs_datetime_string_cast = True     # MySQLdb requires a typecast for dates
 supports_constraints = True
 uses_case_insensitive_names = False
 
diff --git a/django/db/backends/oracle/base.py b/django/db/backends/oracle/base.py
index 4e6314d32e..d277e5b6f7 100644
--- a/django/db/backends/oracle/base.py
+++ b/django/db/backends/oracle/base.py
@@ -61,7 +61,7 @@ class DatabaseWrapper(local):
 
 allows_group_by_ordinal = False
 allows_unique_and_pk = False        # Suppress UNIQUE/PK for Oracle (ORA-02259)
-returns_dates_as_strings = False
+needs_datetime_string_cast = False
 supports_constraints = True
 uses_case_insensitive_names = True
 
diff --git a/django/db/backends/oracle/creation.py b/django/db/backends/oracle/creation.py
index c1387a7ff8..c3326cf843 100644
--- a/django/db/backends/oracle/creation.py
+++ b/django/db/backends/oracle/creation.py
@@ -81,6 +81,8 @@ def destroy_test_db(settings, connection, backend, old_database_name, verbosity=
     settings.DATABASE_NAME = old_database_name
     #settings.DATABASE_USER = 'old_user'
     #settings.DATABASE_PASSWORD = 'old_password'
+    settings.DATABASE_USER = 'mboersma'
+    settings.DATABASE_PASSWORD = 'password'
 
     cursor = connection.cursor()
     time.sleep(1) # To avoid "database is being accessed by other users" errors.
diff --git a/django/db/backends/postgresql/base.py b/django/db/backends/postgresql/base.py
index fd3ef87c45..db92ef5df0 100644
--- a/django/db/backends/postgresql/base.py
+++ b/django/db/backends/postgresql/base.py
@@ -63,7 +63,7 @@ class DatabaseWrapper(local):
 
 allows_group_by_ordinal = True
 allows_unique_and_pk = True
-returns_dates_as_strings = False
+needs_datetime_string_cast = True
 supports_constraints = True
 uses_case_insensitive_names = False
 
diff --git a/django/db/backends/postgresql_psycopg2/base.py b/django/db/backends/postgresql_psycopg2/base.py
index b2722d8d99..1392db7e13 100644
--- a/django/db/backends/postgresql_psycopg2/base.py
+++ b/django/db/backends/postgresql_psycopg2/base.py
@@ -64,7 +64,7 @@ class DatabaseWrapper(local):
 
 allows_group_by_ordinal = True
 allows_unique_and_pk = True
-returns_dates_as_strings = False
+needs_datetime_string_cast = False
 supports_constraints = True
 uses_case_insensitive_names = True
 
diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index c92e83a6ad..dd08011e2e 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -100,7 +100,7 @@ class SQLiteCursorWrapper(Database.Cursor):
 
 allows_group_by_ordinal = True
 allows_unique_and_pk = True
-returns_dates_as_strings = True
+needs_datetime_string_cast = True
 supports_constraints = False
 uses_case_insensitive_names = False
 
diff --git a/django/db/models/query.py b/django/db/models/query.py
index 53a17c23d7..231c5c12b0 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -567,7 +567,7 @@ class DateQuerySet(QuerySet):
         stmt = fmt % (date_trunc_sql, sql, group_by, self._order)
         cursor = connection.cursor()
         cursor.execute(stmt, params)
-        if backend.returns_dates_as_strings:
+        if backend.needs_datetime_string_cast:
             return [typecast_timestamp(str(row[0])) for row in cursor.fetchall()]
         else:
             return [row[0] for row in cursor.fetchall()]