After the domestic application 1 year, you can apply for a patent abroad at any time by claiming priority. And it is regarded as the same as the domestic application date.
It is considered that it is difficult to apply in all countries at the same time on the same day, and it is inevitable that the application will not be authorized abroad because of novelty problems. Therefore, most countries have joined the Paris Convention and enjoy priority within 1 year. If the same content is applied for a patent in a foreign country within 1 year, it shall be deemed as the same as the domestic filing date. 1 year, we can slowly consider which countries need to apply for patents.
In addition, you can also apply for a patent to a foreign country through PCT international application.