Saudi Arabia has announced that Tuesday will be the first day of Dhu Al Hijja, and hence Wednesday will be Arafat Day, and Thursday, October 25, will be the first day of Eid Al Adha.

Source: Gulf News (20 min ago)
http://gulfnews.com/news/gulf/uae/general/thursday-the-first-day-of-eid-al-adha-1.1089840