How to calculate the registration date after copyright transfer?

Time shall be counted from the effective date of the transfer contract. The time limit for registration of patent right transfer is the effective date of the transfer contract. Our country's laws clearly stipulate the transfer of patent right, which has been stipulated in Article 10 of the Patent Law. The fourth paragraph of this article stipulates that if the right to apply for a patent or the patent right is transferred, the parties concerned must conclude a written contract, which will take effect after it is registered and announced by the Patent Office.