In Jain tradition, Diwali (Mahavira Nirvana day) is observed on Kartik Amavasya. For 2025, the main Jain Diwali day is on October 20, 2025. Some local calendars note a two-day Amavasya span, which can extend observation to October 21 in certain places, but most sanghs mark October 20 as the Diwali date. Lakshmi Puja or related rituals typically occur in the evening of October 20, with exact timing varying by locality. You can read more here