The Diwali festival is likely a fusion of harvest festivals in ancient India. It is mentioned in Sanskrit texts such as the "Padma Purana" and the "Skanda Purana" both of which were completed in the second half of the 1st millennium CE. The "diyas" (lamps) are mentioned in Skanda Kishore Purana as symbolising parts of the sun, describing it as the cosmic giver of light and energy to all life and which seasonally transitions in the Hindu calendar month of Kartik.