Movies that span a single day.
Let's make a list.
Rules
1) The main events of the movie fill up all or most of a single day and/or night.
2) Movies with prologues and epilogues that occur on a separate day are allowed.
3) Flashbacks and flashforwards are allowed, so long as the majority of the story takes place during one day/night.
The only ones I can think of are:
Mallrats
Clerks
Dazed and Confused
One Fine Day
Detroit Rock City
200 Cigarettes