Calendrical calculations: For whoever who may be computing Singapore holidays any time in the future: Singapore’s Vesak Day (Buddha’s birthday) holiday does not follow the Buddhist calendar or the recommendation by the first Conference of the World Fellowship of Buddhists held in Sri Lanka in 1950 (that recommended the first full moon in May). It is calculated using the Chinese calendar, but not the 8th day of the 4th moon like the Chinese and the Koreans celebrate it, but seven days later, on the 15th day (calendrical full moon) of the 4th moon.

I lost at least three hours today finding about this, and I found about it by accident, because I had Calendrical Tabulations at hand and happened to look at the Chinese calendar column. There are several conflicting pieces of information on the internet here and there, which really confused me to the point that I thought the actual algorithm is not publicly available.