Acharya Kundakunda’s exact birth date is not historically certain.

According to traditional Jain belief and most modern scholars:

• He was born around the beginning of the 1st century CE (some place him in the 1st–2nd century CE).
• Birth region: South India, at a place called Konda‑konda (hence the name “Kundakunda”). ( jainknowledge.com)

So, we can only safely say: Acharya Kundakunda was born roughly in the early centuries of the Vikram era / around the 1st century CE, but no exact calendar date is agreed upon in either Digambar or Shvetambar traditions.