South and Southeast Asian solar New Year
In many countries of South Asia and South East Asia, the traditional new year is calculated on the sun's entry into the constellation Aries as per the regional Hindu calendars or Buddhist calendars. This event is known by a variety of names in different nations, including Sankranti in India, Pohela Boishakh in Bangladesh, Songkran in Thailand, Aluth Avurudda or Puthandu in Sri Lanka, and Thingyan in Myanmar.
In modern times, it is usually reckoned around 14 April.