Content answers what a screen shows. Playlists answer in what order. Scheduling answers the last question: when.
A screen is not the same all day. A reception display might welcome visitors during office hours and switch to an after-hours message in the evening. A factory board might run safety content on weekdays and go quiet at the weekend. Scheduling is how a single screen does all of that without anyone touching it.
That is the real value of it: you plan ahead instead of reacting. You can decide today what a screen will show on Monday morning, set it once, and leave it. No one logs in before opening to switch the displays, and no one swaps content by hand when the day ends. The plan runs itself.
In Screenly, the schedule lives on the playlist. Each playlist can be set to play only at certain times, and those rules stack: a time of day, a day of the week, a date range, or any combination.
Time of day
Give a playlist a start and end time, and it only plays in that window. This is the heart of dayparting: a morning playlist hands over to a midday one, which hands over to an evening one, all on the same screen.
Day of week and date range
Limit a playlist to weekdays, or to weekends, and it ignores the rest. Give it a start and end date, and it runs only within that period. A campaign with an end date stops on its own when the date passes, with nothing to remember to switch off.