KALYUG
Ancient books of South-East Asia divide time in four eras or Ages: Satyug, Tretaa, Duaapar and Kalyug.
{Treta= when there remained three of the four legs of the throne of righteousness had disapppeared; Duaapar = when there remained three of the four legs of the throne of righteousness had disapppeared, .e. half of righteousness has disappeared; Kalyuga= when three of the four legs of the throne of righteousness have disappeared; according this belief Kalyguga is still going on; it began in 3102 O.E. (it means in 2020, Kalyuga is 5122 years old)}.
These four Yugas are in sequence of time as well as qualities.
Satyug being the foremost, it is considered as the top-most time of the humanity and Kalyug, being the latest, is considered as the lowest time of humanity.
Sikhism does not believe in this division. Any references to these Yugas, in Sikh literature, are relative and metaphoric but not conceptual.
In Sikhism, Kalyug means darkness in the mind of human beings. Similarly, Satyug means the state of enlightenment in a human being. One can live in Satyug by meditating the Name of God and by living Truthful life:
Dark Age is a cutter; the kings are butchers.
The faith has got wings and is flown off. (Guru Granth Sahib, p.145)
Of the Dark Age, the chariot is of fire and falsehood is the charioteer.
(Guru Granth Sahib, p.470)
O Brother! Tell me (about) the faith of Dark Age
How I can get the liberating liberated?
(Answer to the above question):
Have the boat of meditation upon God and His Name as raft.
(That) remembering God will swim you across the one far crossing (the world ocean). (Guru Granth Sahib, p.668)
In the darkest of Dark Age, Only One method is available (useful)
(That) none can tell except perfect Guru.
(Guru Granth Sahib, p.1024)
(Dr Harjinder Singh Dilgeer)