The Bengali Calendar (Bengali: বঙ্গাব্দ Banggabda or বাংলা সন Bāṃlā San) also known as the Bangla Calendar, is the official and national calendar of Bangladesh. On the calendar, Pahelā Baishākh is the New Year and it starts on 14 April or 15 April on the Western calendar if it is either before Pahelā Baishākh, or 593 less if after Pahelā Baishākh.
The Bengali calendar has 6 seasons and each of them make up two months. Starting at Pahelā Baishākh, the seasons are Grišma (গ্রীষ্ম) or Summer; Barṣā (বর্ষা) or Rainy/Monsoon season; Šarat (শরৎ) or Autumn; Hemanta (হেমন্ত) or the Dry season; Šīt (শীত) or Winter; and Basanta (বসন্ত) or Spring.
- Chakrabarti, Kunal; Chakrabarti, Shubhra (2013). Historical Dictionary of the Bengalis. Scarecrow Press. p. 114.