In The Stranger, Meursault's trial for the murder of the Arab begins in June. This is shown in the opening paragraph of Part 2, Chapter Three, in which Meursault says:
My case was down for the last sessions of the Assize Court, and those sessions were due to end some time in June.
Meursault does not give an exact date for his trial. Instead, he says that the day is one of "brilliant sunshine" and that his trial is expected to last two or three days.
At the end of the previous chapter, Meursault informs us that he has spent six months in jail but, to him, it feels like "one and the same day." During this time, he has been questioned over and over by his lawyer and the examining magistrate, he has learned to live without Marie and to sleep for most of the day in his cell. Time has become an abstract concept for Meursault and this feeling is intensified as he awaits the legal decision which will determine the rest of his life.