[Koha-bugs] [Bug 15310] New: Fix duplicate fines issue when changing date or time format

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=15310

            Bug ID: 15310
           Summary: Fix duplicate fines issue when changing date or time
                    format
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Architecture, internals, and plumbing
          Assignee: gmcharlt at gmail.com
          Reporter: veron at veron.ch
        QA Contact: testopia at bugs.koha-community.org

Changing the sysprefs 'dateformat' and/or 'TimeFormat' on a production server
with overdue items that are accruing fines can result in duplicate fines.

It happens when the system has to decide wether to update an existing fine or
to add a new fine.

It is related to C4/Overdues.pm line 538 that parses the fines description for
a date in the current syspref date format ($due_qr). 

if ($rec->{itemnumber} == $itemnum && $rec->{description} =~ /$due_qr/) 

If the dateformat is changed, parsing will not find the date in previous fines
and an extra fine will be applied.

It is not possible to automatically parse for all date formats since dd/mm/yyyy
and mm/dd/yyyy can be ambiguous. The system needs an information about what the
previous date format was (if it changed).

To bridge the issue until we have a rewrite of the accounts system ready, the
previous date- / and time format can be indicated in additional sysprefs.

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