Is there agreement over the year of the Buddha's Parinibbāna?
佛涅槃的年代，有没有不同的计算？

With regard to the year of the Buddha's Parinibbāna, the Buddhists in Southeast Asia generally put it in the year 545 BC, so in 1956 and 1957 many countries ceremoniously observed the 2,500th anniversary of the Buddha's Parinibbāna. In China, however, there are different opinions about the year of the Buddha's passing away, the generally acknowledged year being 486 BC, 59 years later than the Theravādin calendar of Southeast Asia.
关于佛涅槃的年代，东南亚佛教徒一般认为是公元前545年，所以1956年和1957年各国都举行佛涅槃二千五百年盛大纪念。我国关于佛涅槃年代有很多不同的说法，一般公认的年代是公元前486年，与南传佛历相差59年。