The Bengali calendar is a solar calendar which takes into account the seasons. The months of the Bengali calendar and their approximate equivalents in the Gregorian calendar are as follows:

1. Vaeshákha – mid April to mid May
2. Jyaeśt́ha – mid May to mid June
3. Áśáŕha – mid June to mid July
4. Shrávańa – mid July to mid August
5. Bhádra – mid August to mid September
6. Áshvina – mid September to mid October
7. Kárttika – mid October to mid November
8. Agraháyańa – mid November to mid December
9. Paośa – mid December to mid January
10. Mágha – mid January to mid February
11. Phálguna – mid February to mid March
12. Caetra – mid March to mid April

Detailed research needs to be done to make all calendars more accurate. This will make farming more scientific and increase productivity.