Poṣa‑daśamī (Posh Dashami) in 2025 is observed on the tenth day of the Poṣha/Māgsar period. In 2025, the commonly cited date is around December 14, 2025 (Vad Dashami). Local lunar sighting can cause a one-day variation in some Panchangs, so your temple or regional Jain Panchang should be checked for the exact day. Digambar and Śvetambar calendars may have slight differences in the exact observance day, but the essence remains the Poṣha‑daśamī celebration of Parśvanātha. You can read more here