The word "Songkran" comes from Sanskrit to step up. Move up move. This means that in the movement of the Sun from PISCES into Aries, which corresponds to the date by April 13 14 15.
The word "Songkran" comes from the Sanskrit word meaning to move up, move up, move on, this means that the movement of the sun from Pisces into Aries. Which falls on 13 April 15 by 14.