This feature is available in Evergreen version 2.2.
By default, fines accrue only on dates that the library is open. This feature enables you to charge patrons fines on dates the library is closed. Fines accrue during scheduled closings as well as during normal weekly closed dates.
To enable this feature:
1) Click Admin → Local Administration → Library Settings → Charge fines on overdue circulations when closed
2) Click Edit.
3) Set the value to True.
4) Click Update Setting.
Author: Sally Fortin, Equinox Software