For the year 2026, most Jain calendars show:

Śvetāmbara Paryushan (8 days)

• Start: Tuesday, 8 September 2026
• End (Samvatsari – forgiveness day): Tuesday, 15 September 2026

Digambar Das Lakshan Parva (10 days)

• Start: Tuesday, 15 September 2026
• End (Kshamavani – forgiveness day): Thursday, 24 September 2026

Note: Exact dates can differ by 1 day depending on the local panchang and country, so it is always best to confirm once with your local Jain Sangh or temple.

You can read a short explanation here