Every year, on an Amavasya or a New Moon Night, the Hindu festival of Diwali is celebrated in October or November. Traditionally, this festival is referred to as the "darkest night of the year." The fifteenth day of the Kartika month, according to the Hindu calendar, has arrived. Traditionally, the celebrations last 5 or 6 days, starting with Dhanteras and ending with Holi. The date of Diwali is determined by the moon cycle as well as the Hindu lunar calendar.