Dating kali yuga
The "Kali" of Kali Yuga means "strife", "discord", "quarrel" or "contention".
According to Puranic sources, Krishna's departure marks the end of Dvapara Yuga and the start of Kali Yuga, which is dated to 17/18 February 3102 BCE.
According to the astronomer and mathematician Aryabhatta the Kali Yuga started in 3102 BCE.
Chapter 129 is called Golokarohanam, because it describes how Krishna returns to His abode.
By the age of Kali, morality is reduced to only a quarter of that of the golden age, so that the bull of Dharma has only one leg.
The Mahabharata War and the decimation of Kauravas thus happened at the Yuga-Sandhi, the point of transition from one yuga to another.
The Kali Yuga began approximately five thousand years ago, and it has a duration of 432,000 years, leaving us with 427,000 years until the end of the present age.
Within this 432,000 year period, there is a period of 10,000 years that will be a golden age.