The Bengali Calendar ( "Bônggabdô" or "Bangla Sôn") also known as the Bangla Calendar, is the official and national calendar of Bangladesh. On the calendar, Pôhela Bôishakh is the New Year and it starts on 14 April or 15 April on the Western calendar if it is either before Pôhela Bôishakh, or 593 less if after Pôhela Bôishakh.