Preferences: Calendars (2:50) 
The Calendars Preference in Alexandria lets you set up your own calendars to mark closed days and period due days, and assign certain calendars to patron policies.
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Contingent upon your Policies, Calendars are used to help accurately perform certain circulation-based calculations, such as assign due dates, calculate fines, and manage holds, among other things. Therefore, it's essential that you establish your week-to-week schedule and identify specific Closed dates throughout the year. To assist you in setting up your calendar(s) quickly and accurately, we recommend that you obtain a copy of your union's yearly schedule, highlighting all of the Closed dates and holidays for the current—and upcoming—year(s).
These preferences also make it possible to create and assign custom calendars for each of your Policies; helpful for when you have groups of patrons who may be operating on different school levels and/or schedules. For the time being, you are only allowed to create calendars for the entire union—not for a specific site.