Kartika Purnima is a Hindu, Sikh and Jain cultural festival that is celebrated on Purnima (full moon day), the 15th (or 30th) lunar day of the month of Kartika. It falls in November or December of the Gregorian calendar and is also known as Tripurari Purnima or Deva-Deepawali, the gods' festival of lights. Karthika Deepam is a related festival that is celebrated in South India and Sri Lanka on a different date.