Most years, Diwali Puja and Kali Puja falls on the same day but, in some years, Kali Puja might fall one day before Diwali Puja. For Kali Puja, the day when Amavasya prevails during midnight is considered auspicious while for Lakshmi Puja the day when Amavasya prevails during Pradosh is considered a sacred time.