Yes. It is appropriate to write a warm, respectful greeting for Mahaveer Nirvana Kalyanak (Mahavira Nirvana Diwas). Here are simple, Jain-dharmic options you can use or adapt. I’ve kept them clear and traditional.

Short wishes

• Mahavira Nirvana Diwas ni hardik shubhkamnao.
• Mahavir Swami ni Nirvana Diwas par aapne shanti ane pavitrata no aashirvaad.

Moral/thematic message (simple)

• Aaj Mahavir Swami na Nirvana Parva par hamne ahimsa, satya, anekantavada ane aparigraha ni yaad aavechhe. Aap sabne shanti ane samarpan ni prarthana.
• Nirvana Parva par, aapne saachi jivanshaili ane sadachar apva ni pratigya kariye.

Longer, inspirational note

• Mahavir Swami na Nirvana parva par, aapni jivanko ahimsa, satya, aparigraha ane anekanta no marg apva ni pratigya kariye. Tej, chintan, ane seva thi samajik shanti no marg asaan thaay chhe. Jai Jinendra.

Social media caption (compact)

• Mahavira Nirvana Diwas 2025: Ahimsa, satya, ane anekantavada ni oj par, aapna jeevan vikasva ni prerna. Jai Jinendra.

Notes

• Aap tradition (Digambar vs. Shwetambar) vache greetings ma koi vishesh doulat hoy to, dono sampradaya ma ghana pratishtha and samman thi manva ma aave chhe. Aam generally “Nirvana Diwas” no karikram respectfully manavva ma aave chhe.
• Date specific phrases: if you know the exact date in the Vikram Samvat or Gregorian calendar, you can add it (e.g., “Ashwin Shuddha 15” or “[date] par”), but nischit karva mate exact din jova, jinsan na anusar date add kariye.

If you’d like, tell me the tone (formal, informal, devotional) and whether you want a one-liner, a paragraph, or a social media caption, and I’ll tailor a polished message for you.