Deepotsav, Bikaner

The five-day celebration is observed every year in early autumn after the conclusion of the summer harvest. It coincides with the new moon amavasya and is deemed the darkest night of the Hindu lunisolar calendar. The festivities begin two days before amavasya on Dhanteras, and extend two days after, until the second (or 17th) day of the month of Kartik. (According to Indologist Constance Jones, this night ends the lunar month of Ashwin and starts the month of Kartik – but see this and Amanta and Purnima systems. The darkest night is the apex of the celebration and coincides with the second half of October or early November in the Gregorian calendar. The festival climax is on the third day and is called the main Diwali. It is an official holiday in a dozen countries, while the other festive days are regionally observed as either public or optional restricted holidays in India. In Nepal, it is also a multiday festival, although the days and rituals are named differently, with the climax being called the Tihar festival by Hindus and Swanti festival by Buddhists.