The Songkran Festival festival history: The date of the festival was originally set by astrological calculation, but it is now fixed. If these days fall on a weekend, the missed days off are taken on the weekdays immediately following. If they fall in the middle of the week, many Thai take off from the previous Friday until the following Monday. Songkran falls in the hottest time of the year in Thailand, at the end of the dry season. Until 1888 the Thai New Year was the beginning of the year in Thailand; thereafter 1 April was used until 1940. 1 January is now the beginning of the year. The traditional Thai New Year has been a national holiday since then.
Songkran originally was celebrated only in the north of Thailand, and was probably brought there by the Burmese, who adapted it from the Indian Holi festival. It spread across Thailand in the mid 20th century and is now observed even in the far south. However, the most famous Songkran celebrations are still in the northern city of Chiang Mai, where it continues for six days and even longer. It has also become a party for foreigners and an additional reason for many to visit Thailand for immersion in another culture.