In 2025, Diwali Amavasya date is October 21. Diwali Amavasya is the last day in Ashwin Month as per some calendars mentioned above. Amavasya Tarpan is observed along the banks of holy rivers. Pinda daan and Amavasya Tarpan are performed during the auspicious day and pitru karma are observed to please the dead ancestors’ souls. Diwali Amavasya 2025 TimingsAmavasya begins at 3.33 PM on 20 October and ends at 5.43 PM on October 21.