In Jainism there isn’t a single universal muhurat for Diwali puja. The main observance is Mahavira’s Nirvana on Kartik Amavasya, but the exact auspicious timing (muhurta) is decided by local panchang and your sangh or temple calendar. Many communities perform Lakshmi/Ganesh puja in the evening after sunset, but the precise start time can vary by locality. Digambar and Śvetāmbara calendars may differ slightly on the exact tithi, but the spiritual focus remains the same:Mahavira’s Nirvana and the inner illumination of knowledge. You can read more here and here .