公历四五月间的月份，传统上认为佛陀的诞生、成道与般涅槃皆发生于此月，斯里兰卡历代国王长期以节庆隆重纪念此月。

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.