• Aatma (soul): In Jain calendar, there isn’t a separate fixed day called “aatam” that appears as a regular festival or observance. The calendar centers on tithis, pakshas (fortnights), and kalyanaks, with focus on spiritual practices (pratikraman, tapas, puja) on those days. If you meant something else by “aatam,” please tell me more so I can help within Jain tradition.

• Pakhi: Pakhi typically refers to the Pakhi Pratikraman, which is done every fifteen days (on the 15th and 30th days) of the lunar fortnight. In practice, the exact time window for performing Parna (the closing part of the day’s fast) depends on the local panchang and the Digambar/Shwetambar traditions. In short, Pakhi Pratikraman occurs twice a lunar month, on the mid-fortnight days, and Parna is observed after Navkarsi (about 48 minutes after local sunrise) or within the prescribed window for your tradition and place. ( jainknowledge.com)

Notes:

• If you were asking about Chaumasi Pakhi (the Chaumasi observance every four months), that is a separate four-month cycle, and is linked to specific full-moon days in Kartik, Falgun, and Ashadh in the Vir Nirvana Samvat year. ( jainknowledge.com)

If you want, I can point you to a Jain Panchang page for your region to confirm your local timings. You can read more here and here