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