When Does "Death of the Planet of the Apes" (2018) Take Place?
"Death of the Planet of the Apes" is a science fiction novel written by Andrew E. C. Gaska that released November 13th, 2018. So when is "Death of the Planet of the Apes" set?
It takes place on the Planet of the Apes universe timeline in the year:
We know this because when Dr. Milo and his team succeed in turning the ANSA spaceship Liberty 1 back on, its clock panel displays "November 25 3978" then blinks to "January 25 3979" with "a flash" before exploding. This implies the last time the clock was active was in 3978 AD [presumably during the early scene of the first feature film "Planet of the Apes" (1968)] and the clock immediately adjusts to the current date in January of 3979 AD.

3979 AD
We know this because when Dr. Milo and his team succeed in turning the ANSA spaceship Liberty 1 back on, its clock panel displays "November 25 3978" then blinks to "January 25 3979" with "a flash" before exploding. This implies the last time the clock was active was in 3978 AD [presumably during the early scene of the first feature film "Planet of the Apes" (1968)] and the clock immediately adjusts to the current date in January of 3979 AD.
It is the last chronological novel in the Planet of the Apes universe.