K stands for 1000
2k means 2*1000=2000
2k17=2000+17=2017
2017 means the previous year.
So instead of writing a “0” between 2 and 17 we replacing the “0” with a “k” ( 2k17)2017 and same for 2018 (2k18)
by SiSkaYuuRi April 03, 2018