This religious holiday in Iran commemorates the passing of the Prophet Muhammad and the martyrdom of his grandson, Imam Hassan. It is a day of national mourning characterized by religious ceremonies and public gatherings across the country. All government offices, banks, and the Tehran Stock Exchange are closed in observance of this solemn occasion. It is one of the most significant dates on the Iranian religious and public calendar.
The date is determined according to the Islamic lunar calendar, falling on the 28th day of the month of Safar. Because it follows the lunar cycle, the date shifts annually relative to the Gregorian calendar.
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