Hence the difference that has arisen between the Hijri calendar and the Bangla one: 2002 is 1408 of the Bangla year but 1422 of the Hijri year. The lunar year is 11 days shorter than the solar year. The Islamic Hijri calendar is a lunar while the Bangla calendar is a solar one.

Since the month of Muharram 963 AH coincided with the month of Baishakh, the month of Baisakh was made the first month of the new era instead of the month of Chaitra which was the first month of the shakabd, then being used in Bengal.Дuring the four hundred odd years that have elapsed since the Tarikh-e-Elahi was promulgated, a difference of 14 years has arisen between the Hijri and Bangla calendars. With this end in view, he commissioned Amir Fathullah Shirazi, a distinguished scientist and astronomer, to make the changes.ДЄccordingly, the first of muharram 963 AH was also made the starting point of 963 of Tarikh-e-Elahi. From the beginning of his reign, Akbar had felt the need of introducing a uniform, scientific, and workable system of calculating days and months through a reformed calendar. Revenue was collected according to the lunar year, whereas the harvest was dependent on the solar one. However, as Abul Fazl explains in Akbar Namah, the use of the Hijri calendar was irksome to the peasantry because there was a difference of 11 or 12 days between the lunar and the solar years, with 31 lunar years being equal to 30 solar years. Hitherto, the Mughal emperors had been using the Hijri calendar for the purposes of collecting revenue. The purpose of Tarikh-e-Elahi was to glorify Akbar's ascent to the throne as well as to give a new calender for the collection of revenue.

Though the new calendar was promulgated in the twenty-ninth year of Akbar's reign, it dates from his ascension to the throne on 5 November 1556. The new calendar introduced on 10 or 11 March 1584 was initially known as Tarikh-e-Elahi. Bangabda Bangla calendar, also known as 'Bangla Sal', was promulgated by the Mughal emperor akbar in 1584 AD.

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