When Does "Alien: Phobos" (2017) Take Place?
"Alien: Covenant - Phobos" is a science fiction short film written by John Logan with Toby Dye that released August 15th, 2017. So when is "Phobos" set?
It takes place on the fictional Alien vs. Predator timeline in the year:
We know this because it depicts the characters who will become the crew of the colony starship Covenant in the feature film "Alien: Covenant" (2017), which takes place in 2104? AD, being tested for recruitment in an upcoming mission. So it must be sometime but not long before 2104? AD.

2103? AD
We know this because it depicts the characters who will become the crew of the colony starship Covenant in the feature film "Alien: Covenant" (2017), which takes place in 2104? AD, being tested for recruitment in an upcoming mission. So it must be sometime but not long before 2104? AD.
It is the eighth chronological short film in the Alien vs. Predator timeline. It can be watched at its timeline point.