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The Bengali calendar, also known as the Bangla calendar, is a solar calendar used in Bangladesh and the Indian state of West Bengal. It is based on the Hindu solar calendar and incorporates elements of the lunar calendar as well.

The Bangla calendar is a luni-solar calendar, which means that it is based on the cycles of both the sun and the moon. The year is divided into 12 months, with each month consisting of either 29 or 30 days. The first day of the year is usually in mid-April, and is known as Pohela Boishakh or Bengali New Year.

The Bengali calendar is also used to determine important dates in Bengali culture and religion, such as festivals, weddings, and other events. The calendar is closely tied to Bengali traditions and is an important part of the culture of the region.

Today, the Bangla calendar is widely used throughout Bangladesh and West Bengal, and is recognized as an official calendar in both areas.