at what point in time is he telling the story and where is he when he is telling the story

Holden Caulfield, narrating from a psychiatric facility a few months after the events of the novel

Holden Caulfield narrates in the first person, describing what he himself sees and experiences, providing his own commentary on the events and people he describes.

Past tense

setting (time) is a long weekend in the late 1940s or early 1950s