"Nobody told you that we're closed on the 29th did they?"
"Err.. no. No, they didn't."
We have a three-week loan period and so items issued on Saturday have a 29th December due date.
"I changed the due dates as I was going along but I think I missed one or two."
I set the 29th as a closed day on the system at this library so at least nobody will be paying overdue fines for that day. It's generally a good idea to do this a we bit earlier than this but why conform to boring norms?