What is the ruling on one who fasts in a country and then travels to another country that fasted a day later?

Question : The questioner says: Honorable Shaykh, a man fasted in the Kingdom, and in the middle of Ramadan he traveled to his home country, which is a country that fasted a day after the Kingdom. So, does he fast with the people or break his fast?

Answer : Yes, if a person fasts at the beginning of the month in a country and then travels to a country that differs from it in the sighting of the moon, then if that country is ahead of the first country, he breaks his fast with them and makes up whatever is missing from twenty-nine days. For example, if he travels to a country where the sighting was two days earlier, he breaks his fast with them and makes up one day so that the month is twenty-nine days. And the reverse is the reverse: if he travels to another country and does not see the moon until he has completed thirty-one days, then he is required to fast thirty-one days. This is due to the generality of the saying of the Messenger of Allah (peace and blessings be upon him): "When you see it, fast, and when you see it..."