only use now() on pg!

activerecord/test/cases/migration_test.rb

@@ -474,8 +474,10 @@ def test_native_decimal_insert_manual_vs_automatic
         Person.connection.execute "insert into people (id, wealth, created_at, updated_at) values (people_seq.nextval, 12345678901234567890.0123456789, 0, 0)"
       elsif current_adapter?(:OpenBaseAdapter) || (current_adapter?(:MysqlAdapter) && Mysql.client_version < 50003) #before mysql 5.0.3 decimals stored as strings
         Person.connection.execute "insert into people (wealth, created_at, updated_at) values ('12345678901234567890.0123456789', 0, 0)"
-      else
+      elsif current_adapter?(:PostgreSQLAdapter)
         Person.connection.execute "insert into people (wealth, created_at, updated_at) values (12345678901234567890.0123456789, now(), now())"
+      else
+        Person.connection.execute "insert into people (wealth, created_at, updated_at) values (12345678901234567890.0123456789, 0, 0)"
       end
 
       # SELECT