Mahalaya Amavasya is a significant and sacred day in the Hindu calendar dedicated to honoring ancestors. This special Amavasya (new moon) occurs in the Tamil month of Puratasi, which falls between September and October, during the Mahalaya Paksha period. Know Mahalaya Amavasya 2025 date, muhurat time, rituals, traditions & celebrations. Know government & bank holidays in different states. 1. Introduction Brief explanation: Mahalaya Amavasya, also known as Sarvapitri Amavasya, marks the climax of Pitru Paksha and the onset of Devi Paksha —a time for honoring ancestors and embracing divine feminine energy. 2. Date and Time Date: Sunday, September 21, 2025 Samayam TeluguThe Economic TimesPublicHolidays.in Calendar Labs Amavasya Tithi (New Moon): Begins September 21 at approximately 03:47 AM IST, ends September 22 at 04:53 AM IST AstroVed Shraddha Tithi & Muhurats (as per ... Mahalaya Amavasya is the New Moon day, which is the last day of the 15-day period called Mahalaya Paksha.on day to offer Tarpanam (ancestral rituals) to your departed ancestors to receive the blessings.