Calculate library loan periods based on...(Media Manager)

• Open: Choose this setting if you want Destiny to calculate due dates based on your loan periods using only days that are open on your Calendar.
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  For example, if your library is open 5 days a week and you want a loan period to be 2 weeks, set the loan period to 10 days, not 14.

• Calendar: Choose this setting if you want Destiny to calculate due dates regardless of your Calendar.

Changing this setting does not change the due dates of any copies that are currently checked out. It only affects future checkouts.