[kmymoney] [Bug 455596] New: Broken date format

[Ceaus]

https://bugs.kde.org/show_bug.cgi?id=455596

            Bug ID: 455596
           Summary: Broken date format
           Product: kmymoney
           Version: 5.1.2
          Platform: Other
               URL: https://mail.kde.org/pipermail/kmymoney/2020-August/00
                    3527.html
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: ux-ui
          Assignee: kmymoney-devel at kde.org
          Reporter: kde at pohw.nl
  Target Milestone: ---

SUMMARY
It is not possible to use YYYY  if your locale doesn't support it.

As discussed here
(https://mail.kde.org/pipermail/kmymoney/2020-August/003527.html), KMyMoney
should provide a default, unambiguous  date format. Currently the displayed
date format is based on the QT environment settings.  There are a number of
problems with this:
1. Your locale may set a format as MM-DD-YY. Which leads to the well know date
ambiguity.
2. With a two digit year it's impossible to enter date earlier than 1990. 
3. If your locale displays DD-MM-YY, but you really want DD-MM-YYYY, than your
only option is to change the LC_TIME environment variable to something which
uses this short ISO-8601 YYYY format.  But this also changes the date picker.
So now you can't read the days and months anymore, because they are in a
language you don't speak.

Ideally, for financial applications there should not be a dependency on the
locale of the system it is running on. There should be a short list of formats
you can choose from (example: DD-MM-YY, DD-MM-YYYY, MM-DD-YY, MM-DD-YYYY) which
are documented and consistent regardless of environment.

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