Good morning, afternoon, evening, night, Koha

Last summer, I brought the issue of the calendar recoding that had been in limbo for a long time, blocking our tentative features like opening hours and fines by minutes.

Also among my pet peeves was the fact that calendar calculation where nonapologetically very very (very) slow, slowing the script fines.pl but mostly the simple checkin/checkouts.

So Mehdi coded a whole new Calendar (https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=17015).  It includes

•  A new db table storing everyday in the past and future as needed with their respective opening hours.
• Perfect calculation for hourly loans
• Perfect setup for OPAC display of opening hours
• A new intuitive UI
• The patches do not remove the old code.  It stays in parallel for comparison right now.
  
• A patch replacing all usage of the old calendar by the new one.
• A full test suite, replicating all the tests in the previous suite
• An speed improvement of 7x for fines.pl
• A speed improvement of 5-10x for checkin with late fees (depending on elapsed time since due date)
  
• Yeah, 4 minutes for 1000 late returns instead of 21 minutes.

We know this tool is a huge improvement on the previous code.  It also opens a lot more development possibilities for the imagitive Koha developpers.

We'll be pushing for it, and I hope it'll get support.  We'll fix and improve.