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Dating

The dates of Gautama's birth and death are uncertain. Within the Eastern Buddhist tradition of China, Vietnam, Korea and Japan, the traditional date for Buddha's death was 949 BCE, but according to the Ka-tan system of the Kalachakra tradition, Buddha's death was about 833 BCE.

Buddhist texts present two chronologies which have been used to date the lifetime of the Buddha. The "long chronology", from Sri Lankese chronicles, states the Buddha was born 298 years before Asoka 's coronation and died 218 years before the coronation, thus a lifespan of about 80 years. According to these chronicles, Asoka was crowned in 326 BCE, which gives Buddha's lifespan as 624 – 544 BCE, and are the accepted dates in Sri Lanka and South-East Asia. Alternatively, most scholars who also accept the long chronology but date Asoka's coronation around 268 BCE (based on Greek evidence) put the Buddha's lifespan later at 566 – 486 BCE.

However, the "short chronology", from Indian sources and their Chinese and Tibetan translations, place the Buddha's birth at 180 years before Asoka's coronation and death 100 years before the coronation, still about 80 years. Following the Greek sources of Asoka's coronation as 268 BCE, this dates the Buddha's lifespan even later as 448 – 368 BCE.

Most historians in the early 20th century use the earlier dates of 563 – 483 BCE, differing from the long chronology based on Greek evidence by just three years. More recently, there are attempts to put his death midway between the long chronology's 480s BCE and the short chronology's 360s BCE, so circa 410 BCE. At a symposium on this question held in 1988, the majority of those who presented gave dates within 20 years either side of 400 BCE for the Buddha's death. These alternative chronologies, however, have not been accepted by all historians.

The dating of Bimbisara and Ajatashatru also depends on the long or short chronology. In the long chrononology, Bimbisara reigned c. 558 – c. 492 BCE, and died 492 BCE, while Ajatashatru reigned c. 492 – c. 460 BCE. In the short chronology Bimbisara reigned c. 400 BCE, while Ajatashatru died between c. 380 BCE and 330 BCE. According to historian K. T. S. Sarao, a proponent of the Short Chronology wherein the Buddha's lifespan was c.477–397 BCE, it can be estimated that Bimbisara was reigning c.457–405 BCE, and Ajatashatru was reigning c.405–373 BCE.