Mughal emperor Akbarestablished a new calendar based on the old solarBengali calendar in 1584 to ease taxation. The Mughals used "Halkhata Mahurat" to collect taxes and the tradition of Haal Khata is believed to be originated from this. Haal Khata is a Bengali tradition that is over 430 years old. Haal means updating and Khata means ledger.