RWT (Required Weekly Test) EAS tests are scheduled by the individual stations. It is a test to verify the EAS box is functioning.
The RMT (Required Monthly Test) EAS test is a test of the system to ensure the activation system is functioning properly. They are usually scheduled on the first Tuesday of the month. You can look up the schedules on the internet for your state.
You can also download the EAS Operators Handbook to see what the proceedures are.