Janm Kalyanak means the birth anniversary of a Tirthankar (the one who has attained enlightenment and shown the path for others). It is considered a very auspicious occasion in Jainism.

Key points:

• Purpose: to remember the birth of a Tirthankar and to renew one’s commitment to right faith, right knowledge, and right conduct.
• Common practices: visiting temples, performing puja (worship), listening to or reciting life-stories of the Tirthankar, meditating, giving charity, and sometimes fasting or special prayers.
• Which Tirthankar: each Tirthankar has his or her own Janm Kalyanak. The most widely observed is the birth anniversary of Mahavira, but other Tirthankaras are celebrated too. Dates and customs can vary between Digambara and Śvetāmbara communities, and between regions.
• Digambar vs Śvetāmbara: Both honor the Janm Kalyanak, but the exact rituals, dates, and regional customs may differ.

If you tell me which Tirthankar you’re asking about (for example, Mahavira or Parshvanath) or which tradition you follow (Digambar or Śvetāmbara), I can share more precise details about that Tirthankar’s Janm Kalyanak and the specific customs observed.