How to calculate the validity period of the invention patent right?

the term of patent right refers to the legal expiration and termination time of patent right. From the date of the announcement of the authorization of the patent right, if the patent right is not terminated due to other reasons, the patent right will be terminated on the date when the patent right expires. According to the provisions of the patent law, the term of invention patent is 2 years; The term of utility model patent and design patent is 1 years, counting from the date of application. According to Article 42 of the Patent Law of the People's Republic of China, the term of the invention patent right is 2 years, and the term of the utility model patent right and the design patent right is 1 years, all of which are counted from the date of application.