公曆四五月間的月份，傳統上認為佛陀的誕生、成道與般涅槃皆發生於此月，斯里蘭卡歷代國王長期以節慶隆重紀念此月。

The month of April/May, traditionally held to be when the Buddha’s birth, Enlightenment, and passing away all occurred, and long celebrated with a festival by the kings of Sri Lanka.