The time-cycle of creation is that each Chatur-Yuga is 43,20,000 years, split up as such:
1 deva day = 1 human year.
1 deva year = 360 deva days.
1 deva year = 360 human years.
kali yuga = 1000 deva years, + 100 deva years 'sandhi' before and after
dwapara = 2000 deva years, + 200 deva years 'sandhi' before and after
treta = 3000 deva years, + 300 deva years 'sandhi' before and after
krita = 4000 deva years, + 400 deva years 'sandhi' before and after
So does that mean that when Sri Krishna left earth, the post-sandhi period of Dwarapa Yuga (200 deva years), got completed, and now we are in the pre-sandhi period of Kali Yuga (100 deva years)?
100 deva years = 36,000 human years. Of which we are currently (2018) in year 5120.
Does that mean Kali-Yuga-Proper (after pre-sandhi period is over) doesn't start until 31000 years from now?
Note - Some people assume that these numbers (1000, 2000 etc.) are in human years, but they're not.