Shab Yalda 2024 Calendar. Yalda night was one of the holy nights in ancient iran and included in the official calendar of the iranian achaemenid empire from at least 502 bc under darius i. Many of its modern festivities and customs remain unchanged from this period.

Yalda night, one of the most important iranian celebrations, has a rich historical legacy dating back millennia, long before the birth of christ. It is called the last night of autumn and the longest night of the year.