Sa'id bin Abi Arubah narrates from Qatadah (may Allah have mercy on him) that Husayn bin Ali (may Allah be pleased with them both) was martyred on a Friday, the day of Ashura, the 10th of Muharram, 61 AH, at the age of 54 years and six and a half months.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخسوف / 6351