BHASKARABDA

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Context

Bhaskarabda, an era counted from the date of the ascension of a seventh century local ruler, will be added to Saka and Gregorian eras in the official calendar of the Assam Government.

About

Bhaskarabda, an era counted from the date of the ascension of a 7th-century local ruler, will be added to the Saka and Gregorian in the official calendar of the Assam government.
Unlike Gregorian, where a day starts at midnight, the Assamese calendar begins and ends at sunrise over 24 hours.
While the Gregorian goes by the solar cycle, the Saka and Bhaskarabda eras use a luni-solar system based on both the phases of the moon and the solar year.
The gap between Bhaskarabda and Gregorian is 593 years.
Bhaskarabda began when Kumar Bhaskaravarman was crowned ruler of the Kamrupa kingdom.
He was a contemporary and political ally of northern Indian ruler Harshavardhana.

Gregoria Calender

The Gregorian calendar is the calendar used in most of the world. It was introduced in October 1582 by Pope Gregory XIII as a minor modification of the Julian calendar, reducing the average year from 365.25 days to 365.2425 days, and adjusting for the drift in the 'tropical' or 'solar' year that the inaccuracy had caused during the intervening centuries.
The calendar spaces leap years to make its average year 365.2425 days long, approximating the 365.2422-day tropical year that is determined by the Earth's revolution around the Sun.
The Gregorian calendar modified the existing Julian calendar, which Julius Caesar had introduced to the ancient Roman Republic in 46 BCE.

Saka Calender

Introduced in: 79 CE
Adopted in: 1957
Starts on: March 22
Number of days: 365
Number of months: 12
Basis of Calender: Luni-solar
Perused by: Gazette of India, All India Radio News Broadcast, Government of India.

The names of the months in the Saka Calendar are:

Chhaitra (March 21 – April 20)
Vaishakha (April 21-May 21)
Jyeshtha (May 22-June 21)
Ashadha (June 22- July 22)
Shravana (July 23-August 22)
Bhaadra (August 22-September 22)
Ashwin (September 23-October 22)
Kartika (October 23-November 21)
Agrahayana (November 22-December 21)
Pausha (December 22-January 20)
Magha (January 21- February 19) and
Phalguna (February 20-March 20/21)