Bengali calendars
The Bengali Calendar or Bangla Calendar (Bengali: বঙ্গাব্দ, lit. 'Baṅgābda'), colloquially (Bengali: বাংলা সন, romanized: Baṅgla Śon), is a solar calendar used in the Bengal region of the South Asia. A revised version of the calendar is the national and official calendar in Bangladesh and an earlier version of the calendar is followed in the Indian states of West Bengal, Tripura and Assam. The New Year in the Bengali calendar is known as Pôyela Boishakh. The calendar was introduced by Emperor Shashanka of Gauda.