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 has traditionally been celebrated as the New Year for many centuries, and is believed to have been adapted from an Indian festival. It is now observed nationwide, 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. The most obvious celebration of Songkran is the throwing of water. Thais roam the streets with containers of water or water guns (sometimes mixed with mentholated talc), or post themselves at the side of roads with a garden hose and drench each other and passersby.
This, however, was not always the main activity of this festival. Songkran was traditionally a time to visit and pay respects to elders, including family members, friends, neighbors, and monks. Besides the throwing of water, people celebrating Songkran as a Buddhist festival may also go to a wat (Buddhist monastery) to pray and give food to monks. They may also cleanse Buddha images from household shrines as well as Buddha images at monasteries by gently pouring water mixed with a Thai fragrance (Thai: นำ้)