Here’s the basic, simple difference:

1. What is “Digambar Panchang”?

• “Panchang” = Jain lunar calendar (tithi, month, festivals, paryushan dates, kalyanak, etc.).
• Digambar Panchang means:

- Calendar prepared according to Digambar tradition - Based on rules accepted by Digambar Acharyas / math / sanghs - Used mainly by Digambar Jains for deciding: - Paryushan / Das Lakshan dates - Kshamavani day - Kalyanak days (e.g. Parshvanath Janma, Mahavir Janma, etc.) - Vrats, parva, ayambil oli, etc. ( jainknowledge.com)

Many times, these dates (especially in English/Gregorian calendar) will differ by 1 day from Shwetambar/Tapagach calendars because:

• Calculation rules are a bit different
• Different traditional panchang-granth are followed
• Local longitude, sunrise rules, etc. differ ( jainknowledge.com)

You can see a Jain explanation about Digambar festival dates here

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2. What is “Tapagach sub-sect”?

• Tapagach = a sub-sect of Shwetambar Murtipujak Jains.
• Full name often written as: Shri Shwetambar Jain Murtipujak Tapagach Sangh ( jainknowledge.com)
• They have:

- Their own guru‑parampara (Acharyas, pravartaks, etc.) - Their own prakriya for panchang and festival observance - Their own printed Tapagach Panchang / calendar which many Tapagach families follow

More info on Tapagach Sangh is here

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3. Main practical differences

Both panchangs are Jain and use the same lunar system (tithi, paksh, maas), but:

1. Sampradāy / Tradition

- Digambar Panchang → based on Digambar tradition. - Tapagach Panchang → based on Shwetambar Murtipujak – Tapagach tradition.

1. Festival dates (English calendar)

- Tithi is usually the same (for example: Pausha Krishna Dashami for Parshvanath Janma Kalyanak). - But the English date may differ (e.g. 6 Jan vs 7 Jan) because: - Different panchang-books and calculation rules are followed - Sunrise / tithi overlap handled differently in each tradition ( jainknowledge.com)

1. Parv like Paryushan / Das Lakshan

- Shwetambar (Tapagach etc.) usually observe 8‑day Paryushan ending in Samvatsari. - Digambar observe 10‑day Das Lakshan Parva, usually starting after Shwetambar Paryushan ends, and ending on Anant Chaturdashi. - So dates in English calendar will naturally look different. ( jainknowledge.com)

1. Which one should you follow?

- If your guru / family / sangh is Digambar → follow Digambar Panchang. - If your guru / family / sangh is Tapagach (Shwetambar Murtipujak) → follow Tapagach Panchang. - Spiritually, bhav, vrat, and discipline are more important than 1‑day difference in civil date.

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Short summary

• Digambar Panchang = calendar according to Digambar Jain tradition.
• Tapagach Panchang = calendar according to Shwetambar Murtipujak Tapagach sub‑sect.
• Structure of calendar is same (lunar tithi etc.), but calculation methods and accepted authorities differ, so festival dates in the English calendar may not always match.