The reason for this situation is the assumption that Time is Linear.
West thinks Time is Linear.
Time flows in one direction that is forward.
What if Time is Cyclic?
That is, it flows around and depending on where you are.
Time moves both forwards and backwards .
Time is a stream; so is Space. Per se they are Absolute.
They are Relative to the observer.
To put it in simpler words ,things exist in Space and Time at all times irrespective of your positioning and what we say to day has happened ,is right now happening at another level for an observer positioned to observe it
For them, our Universe is Past.
Similarly for another observer, what we see as future, may be Present.
Indian Concept of Time.
Hinduism advocates Cyclic Theory of Time.
TIME- Calculation in Hindu Philosophy.
3.2 seconds- 1 Kaashtai.
30 Kaashtais or 1.6 minutes or 96 seconds -1 Kalai
30 kalais or 48 minutes – 1 Muhurtham
30 Muhurthams or 1440 minutes one day.24 hrs of western time)
15 Days -one Paksha
2 Paksas – one Month
6 Months -one Ayanam
2 Ayanams -one Year)
There are Four AEONS (yugas).-In terms of Man-Years.
I. Kali Yugam 4, 32,000 years.
II. Dwapara Yuga 8, 64,000years. (Kali x 2)
III. Tretha Yuga 12, 96,000 years. (Kali x 3)
IV. Krita Yuga 17, 28,000 years. (Kali x 4)
V. Total 43, 32,000 years
For Devas, in the next plane of existence, one year by human calculation is one day.
For details on this see under Time,Astrophysics
Aryabhatta was the ancient Astronomer and mathematician of India.
He was the first astronomer of the world
He used the as Zero Day the beginning of Maha Yuga of Hinduism.
But as the number of years were innumerable, the beginning of Kaliyuga was taken as the starting Day by the later Astronomers of India,(from the midnight of 17-18 February 3102 BCE (BC)
This was called Ahargana.
Julian Calendar uses Greenwhich mean noon of 1st January, 4713 BCE (BC).
Hinduism Calculates Time at Ujjain Map co ordinates.
More details are at the Links below.