In 1912, Vajiravudh announced the change in the solar calendar era from the Rattanakosin Era (R.S.) designated by Chulalongkorn to the Buddhist Era with the year beginning 1 April 2455 BE (1912 CE).
En 1912, Vajiravudh anunciou o cambio no calendario solar en uso, pasando da era Rattanakosin establecida por Chulalongkorn á era budista que comezou o 1 abril de 2455 BE (1912).