Diwali, also called Deepavali, is one of the biggest and most auspicious festivals celebrated by Hindus in Guyana and around the world. The five-day long festival starts with Dhanteras and culminates with Bhai Dooj. Diwali marks the start of the Hindu New Year. The date of Diwali, which is determined by the position of the moon, changes each year, but usually falls somewhere between October and November.