Time
Schedules run on each screen's own clock, which makes the clock itself worth understanding.
In this section
Time zones
Every screen evaluates its schedule against its own local time, so 9am means 9am in each city. How to change a screen's time zone, and when not to.
Clock accuracy
A schedule is only as good as the clock evaluating it. How screens get the time, and the one case where a player comes back wrong.