Ruling on Relying on the Calendar for Fasting Ashura

Question: I am a young man whom Allah has guided to the light of truth, and I wish to fast Ashura and all the other virtuous days other than Ramadan. Should we rely on the calendar to determine the day of the entry into the month of Muharram for fasting Ashura, or is it better to exercise caution by fasting the day before and the day after? May Allah reward you with good?

Answer: You must rely on the sighting of the moon. If the sighting is not confirmed, you should exercise caution by completing Dhul Hijjah as thirty days. May Allah guide them all.