In the Name of God, the Most High

1-One who embarks on a journey after midday, his fast is valid and he must keep fasting on that day.

2- If a traveler in the month of Ramadhan, regardless of whether he was travelling before Fajr or was travelling after dawn while fasting, reaches his hometown before Zuhr or a place where he intends to stay for ten days, and if has not committed an act which invalidates a fast, he should fast on that day. But if he has committed such an act, it is not obligatory on him to fast on that day.