The Fast of Youmul 'Arafah
For those not performing hajj, it is mustahabb (desirable) to fast on this day according to their own calendar. It sometimes occurs that 9th Zuihijjah falls on different days in different countries according to the sighting of the moon. In such cases, Muslims of each country should observe 'Youmul 'Arafah according to the lunar dates of their own country.
For example, if 'Youmul 'Arafah' is being observed in Saudi Arabia on Friday, and in Pakistan on Saturday, Pakistani Muslims should treat Saturday as 'Youmul 'Arafah' and should fast on that day if they desire to benefit from the fast of 'Youmul'Arafah'.
The fast of 'Youmul 'Arafah' has been emphasized by the Holy Prophet, Sall-Allahu alayhi wa sallam, as a mustahabb (desirable) act. According to a hadith, the fast of this day becomes a cause, hopefully so, of forgiveness for sins committed in one year.