gnucash master: A truly ancient bug, discovered with an Xcode-5.1 compiler warning.

[Geert Janssens]

On Tuesday 20 May 2014 10:02:32 Bob Gustafson wrote:
> On 05/20/2014 09:41 AM, John Ralls wrote:
> > On May 20, 2014, at 1:55 AM, Geert Janssens <janssens-
geert at telenet.be> wrote:
> >> On Tuesday 20 May 2014 02:41:55 Mike Alexander wrote:
> >>> --On May 19, 2014 7:07:46 PM -0400 John Ralls
> >>> <jralls at code.gnucash.org>
> >>> 
> >>> wrote:
> >>>> Updated	 via  https://github.com/Gnucash/gnucash/commit/eabaee8e
> >>>> (commit) 	from 
> >>>> https://github.com/Gnucash/gnucash/commit/6e62ce99
> >>>> (commit)
> >>>> 
> >>>> 
> >>>> 
> >>>> commit eabaee8eb58c557743b8b1b476b4145b97eb9836
> >>>> Author: John Ralls <jralls at ceridwen.us>
> >>>> Date:   Thu May 15 17:04:26 2014 -0700
> >>>> 
> >>>>     A truly ancient bug, discovered with an Xcode-5.1 compiler
> >>>> 
> >>>> warning.
> >>> 
> >>> Should this go on maint?
> >> 
> >> While this is a bug I think it would not have had any influence in
> >> practise because the loop always breaks before the end of the
> >> string is reached for all known date formats.
> > 
> > Yeah, obviously that condition never mattered in practice because it
> > would never be false.> 
> >> But I have backported the fix to maint anyway.
> >> 
> >> 
> >> And perhaps this is a good moment to point out that the routine
> >> itself is flawed and should be improved during the conversion to
> >> boost::datetime.
> >> 
> >> The issue with this routine is that it assumes that short date
> >> formats consist of only digits and a separator for all known
> >> locales. This is false. There are several oriental locales for
> >> which the short date format starts with a day-of-the-week field.
> >> For these locales the dateSeparator routine will return the first
> >> character of today's day of the week instead of the real
> >> separator. So every day of the week it would discover a different
> >> separator.
> >> 
> >> This is strongly related to bug
> >> https://bugzilla.gnome.org/show_bug.cgi?id=497831 although the
> >> dateSeparator routine is only one part of the problem. The other
> >> part is the code that tries to guess an incompletely entered date
> >> in the register code. That part trips over the day-of-week part as
> >> well.
> >> 
> >> Hopefully boost::datetime can help here.
> > 
> > I sure hope so. It has its own parsers and formatters that I hope
> > will do everything we need.
> > 
> > One other thing I intend to do in that change is get rid of the
> > entry-date-changes-with-timezone problem forever by making
> > entry-date a plain date, no time component and no timezone. ISTM
> > posted date should continue to be a full timestamp. Are there any
> > other date-times where it's important that they should be one or
> > the other?
> > 
> > Regards,
> > John Ralls
> 
> It is useful to have time and timezone on transactions that may
> involve a change of currency. Even within one country and currency
> (US) it is possible to have transactions occurring in different
> timezones.
> 
Please bear in mind that you can't enter such information in the current 
version of gnucash either but it's recorded behind the scenes.

Until now I have only seen disadvantages of the fact that we keep track 
of timezone and time information. Reports are off, scheduled 
transactions trigger at the wrong time,...

Can you give an example where it would add value to keep timezone 
information in GnuCash as it is now ?

Geert