AWS RDS timezone

Changing the time zone can be found here:

http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Appendix.Oracle.CommonDBATasks.html

Near the bottom you will find this:

Setting the Database Time Zone

You can alter the time zone of a database by running the rdsadmin_util procedure as shown in the following table. You can use any time zone name or GMT offset that is accepted by Oracle.

Oracle Method	Amazon RDS Method
alter database set time_zone = '+3:00';	exec rdsadmin.rdsadmin_util.alter_db_time_zone('+3:00');

After you alter the time zone, you must reboot the DB Instance for the change to take effect.

There are additional restrictions on setting time zones listed in the Oracle documentation.