The Thai New Year (Thai: สงกรานต์Songkran) is celebrated every year on 13 April to 15 April. It is also celebrated in Laos (called pi mai lao or 'Lao New Year' in Lao), Cambodia, Myanmar (where it is called Thingyan), and by the Dai people in Yunnan, China. Sri Lanka also celebrates a similar festival called Sinhalese and Tamil New Year on the same dates. The same date is celebrated widely throughout the Indian subcontinent, albeit based on the astrological event of the sun beginning its northward journey.
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. 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.