He must complete the fast of the day he traveled, and if he breaks his fast, he must make up a day in its place; because traveling does not permit breaking the fast on the day when dawn breaks upon him while he is in his country, and there is no expiation upon him; due to the ambiguity of travel, and expiation is not required in cases of ambiguity. See: Al-Hadiyyah Al-Alaiyyah, p. 175.