Happy Diwali. Shubh Diwali. Diwali Festival, which is also known as Festival of Lights, is celebrated for five consecutive days at the end of Hindu month of Ashwayuja. Diwali, Deepavali, Dipavali, Dewali or Deepawali, marks the beginning of the Hindu New Year and celebrated on the 15th day of Kartika in the Hindu calendar.