In Jain tradition, “pakhi” upvās are usually done on Aatham (8th tithi) and Chaudas (14th tithi) of each fortnight.

For January 2026 (India-based Jain calendar) the dates come out as:

• Chaudas Pakhi (14th tithi):

- Friday 2 January 2026 – Shukla Paksha Chaudas - Saturday 17 January 2026 – Krishna Paksha Chaudas - Saturday 31 January 2026 – Shukla Paksha Chaudas

• Aatham Pakhi (8th tithi):

- Saturday 10 January 2026 – Krishna Paksha Aatham - Monday 26 January 2026 – Shukla Paksha Aatham

Different Jain sanghs or desh (e.g., Khartar Gacch, Tapā Gacch, Digambar) may follow slightly different local panchāngs, so it is always best to confirm once with your local Jain calendar or upāshray/derāsar for your city.