Diwali is derived from the Sanskrit word “dipavali” which means “row of lights,” and is celebrated on the 15th day of the Hindu month of Kartik, which typically falls between October and November.
The date for the festival of lights changes each year, however, Diwali usually takes place on the day of the new moon or Amavasy, which is holy to Hindus and considered the darkest night of the year.
Rituals and preparations for Diwali begin days or weeks in advance, after the festival of Dussehra which precedes Diwali by around 20 days.