For the present era (7th Manvantara of the present day of Brahma) the counting of time started in 4174 BCE.
As far as the scientific evidence of Mahabharata is concerned, the first and foremost evidence is the archaeological findings of Prof.
• There are more than 2,500 Archaeological sites, two-thirds of which are along the recently discovered dried up Sarasvati River bed. Om is mentioned in the Mundaka and Katha Upanisads as well as the Bhagavad Gita.These sites show a cultural continuity with the Vedic literature from the early Harrapan civilization up to the present day India.• The significance of establishing this date for the drying up of the Sarasvati River is, that it pushes the date for the composition of the Rig Veda back to approximately 3,000 B. E., as enunciated by the Vedic tradition itself.• The late dating of the Vedic literatures by indologists is based on speculated dates of 1,500 B. This piece of pottery from the lowest level of Harappan excavations with pre-harappan writing is deciphered as ila vartate vara, referring to the sacred land bounded by the Sarasvati River, described in the Rig Veda.The drying up of the Sarasvati River around 1900 B. Marine archaeology has also been utilized in India off the coast of the ancient port city of Dvaraka in Gujarat, uncovering further evidence in support of statements in the Vedic scriptures.An entire submerged city at Dvaraka, the ancient port city of Lord Krishna with its massive fort walls, piers, warfs and jetty has been found in the ocean as described in the Mahabharata "After all the people had set out, the ocean flooded Dvaraka, which still teemed with wealth of every kind. Rao, formerly of the Archaeological Survey of India, has pioneered marine archaeology in India.On the contrary, the Vedas speak of the mighty Sarasvati River and other places indigenous to India. Max Muller, the principal architect of the Aryan Invasion theory, admitted the purely speculative nature of his Vedic chronology, and in his last work published shortly before his death, The Six Systems of Indian Philosophy, he wrote: "Whatever may be the date of the Vedic hymns, whether 15 hundred or 15,000 B. E., they have their own unique place and stand by themselves in the literature of the world."For example, the language and symbolism found on the Harappan seals are very Vedic.
To date, no evidence for a foreign intrusion has been found, neither archaeological, linguistic, cultural nor genetic. We find the Om symbol, the leaf of the Asvatta or holy banyan tree, as well as the swastika, or sign of auspiciousness, mentioned throughout the Vedas.Here the Indus River is on the left, outlined in blue, while the Sarasvati River basin is outlined in green. Following major tectonic movements or plate shifts in the Earth's crust, the primary cause of this drying up was due to the capture of the Sarasvati River's main tributaries, the Sutlej River and the Drishadvati River by other rivers.The black dots are the many archeological sites or previous settlements along the banks of the now dry Sarasvati River. Although early studies, based on limited archaeological evidence produced contradictory conclusions, recent independent studies, such as that of archaeologist James Shaffer in 1993, showed no evidence of a foreign invasion in the Indus Sarasvata civilization and that a cultural continuity could be traced back for millennia.However, cultural impact and continuity is considered an integral part in validating and endorsing historic prevalences and other fields related to history, such as cultural anthropology.In that sense, even if it's a story today, there is still scope for future evidence to meet and validate the events.This theory is still taught as fact in many educational systems despite much contrary evidence.