Bengali Calendar Converter

The Bengali era counts from 593 or 594 of the common era, depending on where in the year you land. It is credited to king Shashanka of Gauda and was reworked under Akbar, who needed tax collection tied to the harvest rather than to the Islamic lunar year, and it survived as an agricultural and cultural calendar. The arithmetic is small: from 14 April onwards subtract 593 from the Gregorian year, before that subtract 594. So 14 April 2026 opens year 1433 BS while 1 January 2026 was still in 1432. This page runs that conversion and names the month instead of numbering it.

What makes the Bangladeshi version worth computing is the reform Bangla Academy brought into force on 14 April 2019, the first day of 1426 BS. The first six months now run 31 days, Kartik through Magh run 30, Falgun runs 29 and picks up a thirtieth only when the February it starts in has 29 days, and Choitro closes with 30. Tied to the Gregorian year that way, the national dates and the whole calendar up to 13 February land on the same Gregorian day every year, while from 1 to 14 March the Falgun numbering slides by one in leap years, because that is where 29 February goes. Pinning the national days was the whole point of the reform. Since then 21 February is always 8 Falgun, 26 March is always 12 Choitro, 15 August is always 31 Srabon and 16 December is always 1 Poush. Those five anchors are the easiest way to audit any converter claiming to follow the current rule.

Pick a Gregorian date and the page returns the day, the month in Latin transcription and in Bengali script, the year in Bangabda, how many days that month holds, the Gregorian date the month opened on, and the Pohela Boishakh that opened the running year. What it will not do: it does not compute the sidereal Bengali calendar still kept in West Bengal, Assam and Tripura, where the year starts on 14 or 15 April and month lengths follow solar transits. For any date before 14 April 2019 the page says plainly that it is projecting the current rule backwards, which is not what almanacs of the period would print.