Diwali is celebrated for a duration of five days. This festival, also known as the Festival of Lights, marks the victory of good over evil and the arrival of the Hindu New Year. The celebrations typically begin two days before the main day of Diwali, which is called the 'main Diwali' or the third day, and extend two days after. In total, the festivities encompass five days filled with rituals, lighting of lamps, decorating homes, exchanging gifts, and public celebrations such as fireworks and fairs.

The specific dates for Diwali vary each year depending on the lunar calendar, but it usually falls between October and November, coinciding with the new moon (amāvasyā). For example, in 2025, Diwali is observed starting on October 20 and lasts for five days.

This multi-day celebration is embraced by diverse communities in India and around the world, symbolizing themes of prosperity, renewal, and spiritual victory.