For details on this see under Time,Astrophysics
Aryabhatta is the ancient Astronomer and mathematician of India.
He was the first astronomer of the world
This was called Ahargana.
Thousand years later, a Julian Day Number was started by a French Scholar Joseph Scaliger in CE (AD) 1582.
Aryabhatta used the beginning of Maha Yuga as the Zero day while Julian Calendar uses Greenwhich mean noon of 1st January, 4713 BCE (BC).
( Starts from the midnight of 17-18 February 3102 BCE (BC))
Hinduism Calculates Time at Ujjain Map co ordinates.
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