Dr. Manish Pandit dates when Gautam Buddha attained Nirvana and it is a shocker! P1

It is now established that Adi Sankara was born in 509 BCE. So Gautama Buddha should have been born much earlier, given how Buddhism had spread to the entire Bharatavarsha. Using several facts, Dr. Manish Pandit arrives at the date when Buddha attained Nirvana.