Mahaveer Swami is traditionally placed in the 6th century BCE. In Jain tradition, he is commonly said to have been born around 599 BCE and attained nirvana around 527 BCE; some sectarian traditions may give slightly different dates. ( britannica.com)

If you meant “when did Mahaveer Swami live?”, the short answer is: about 599 BCE to 527 BCE. ( britannica.com)