First New Year's Day of the Adopted Solar Calendar · First New Year's Day of Siam's adopted solar calendar

Siam's adopted solar calendar had its first New Year's Day in 1888. A legacy row dated 6 April 1888 at the Grand Palace hints at the observance, coinciding with the 106th anniversary of the 1782 epoch.

King Chulalongkorn adopted the Thai solar calendar in 1888 as the Siamese version of the Gregorian calendar, replacing the Thai lunar calendar as the legal calendar. The epoch for Year 1 was 6 April 1782, with the accession of Rama I, the foundation of the Chakri dynasty, and the founding of Bangkok as the capital of the Rattanakosin Kingdom; this epoch date is distinct from the observance date. A legacy row dated 6 April 1888 at the Grand Palace in Bangkok hints at the first observance, which would coincide with the 106th anniversary of the epoch, but no supplied passage states an April 1888 observance date or the Grand Palace location, so the occurrence is dated at year-level precision.

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