You are terminated when they stop paying you--that is, when they will no longer pay you for the work (if they will pay you but you are awaiting the next payday to receive the check or payment, that is different; as long as you will be paid in due course for your work, you are still employed). It does not matter what they consider the termination date: from the moment they refused to pay you for your work, you were terminated, since there is NO legal right to make people work for free, and termination (like resignation) can be done by actions as well as by words.