When Does "Metal Gear Rising: Revengeance" (2013) Take Place?
"Metal Gear Rising: Revengeance" is a spy science fiction video game written by Etsu Tamari with Hideo Kojima designed for the PlayStation 3 as well as XBOX 360 systems that released February 19th, 2013. So when is "Revengeance" set?
It takes place on the fictional Metal Gear timeline in the year:
We know this because Boris states, "Andrey Dolzaev, leader of the occupation forces. An extremist, linked to both the St. Petersburg massacre of 2015, and last year’s terror spree in Georgia." so we know it is after 2015 AD.

2018 AD
We know this because Boris states, "Andrey Dolzaev, leader of the occupation forces. An extremist, linked to both the St. Petersburg massacre of 2015, and last year’s terror spree in Georgia." so we know it is after 2015 AD.
More specifically, Steven Armstrong clearly says "4 years later their legacy lingers", referring to the events of "Metal Gear Solid 4: Guns of the Patriots" (2008), which take place in 2014 AD.
2014 + 4 = 2018.
It is the last chronological game in the Metal Gear timeline. It can be played at its timeline point.