Fasting and breaking the fast are done with the people of the country

This is a man who says: He fasted in his country, which is later than our country, Saudi Arabia, and the people of his country broke their fast later than us. The people of his country fasted for thirty days, and we fasted for thirty days; but the thirty days in our country correspond to twenty-nine days for him! What is the ruling?
He should break his fast with the people of the country where he is when they break their fast, and it is not obligatory for him to complete thirty days. However, if he completes the thirty days by considering the completion of thirty days in both countries, that is better.