A live countdown to the Day of Arafah — the pinnacle of Hajj, and a warmly recommended fasting day for Muslims who are not on pilgrimage.
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The Prophet ﷺ said fasting on the Day of Arafah "expiates the sins of the past year and the coming year" (Sahih Muslim) — this applies to Muslims who are not performing Hajj that year, since pilgrims at Arafah do not fast.
The exact date depends on the Hajj authorities' moon sighting in Makkah — this is a reliable estimate using the tabular Hijri calendar.