Today (Wednesday, 17 December 2025) is Trayodashi (13th tithi), not Chaudas.

For India (IST), this week’s Krishna‑paksh Chaudas (Chaturdashi / Chaudas) will be on:

> Thursday, 18 December 2025 > (Krishna Paksh Chaturdashi, starts early morning of 18th and runs till early morning of 19th)

Chaudas can differ by country and even by city, so for exact local Jain observance you should confirm with your local Jain panchang or derasar notice.