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The auspicious day of Diwali is decided by the moon position & according to the Hindu calendar, Amavasya or the "no moon day" is considered the perfect day for Diwali. The dark night comes after every fortnight & in the Hindu month of Kartik (October/November), it marks the festive occasion. The Diwali date holds an imperative meaning among the Hindus, since, the day is reckoned with Lord Rama's coronation ceremony as the King of Ayodhya after his return to the kingdom from 14 years of exile along with his wife Sita & brother Laxman after killing the demon, King Ravana. People celebrated this occasion by lighting diyas to drive away the darkness of amavasya.