[Kde-pim] KMail and KOrg incorrect time zone offset?

[Sergio Martins]

On Saturday, May 10, 2014 09:57:45 John Layt wrote:
> Hi,

> If Plasma is showing the right time, then that suggests KTimeZone is
> reading the tz details right, and my initial thought was perhaps the
> RFC date formatting had a bug, but if his KOrg appointments are also
> wrong then that suggests something deeper.  Any thoughts on how to
> debug?

Hi,

Looks like it's KTimeZone's fault.

#include <QDebug>
#include <KDateTime>
#include <ktzfiletimezone.h>

int main()
{
  KTzfileTimeZoneSource source("/usr/share/zoneinfo/");
  KTzfileTimeZone zone(&source, "Africa/Johannesburg");
  
  KDateTime t(QDate(2013, 05, 10), QTime(13, 00), KDateTime::Spec(zone));
  qDebug() << "Zone is valid?" << zone.isValid();
  qDebug() << t.toString();
  
  return 0;
}

This outputs:
Zone is valid? true 
"2013-05-10T13:00:00+03:00"

Which is wrong, because Johannesburg is UTC+2, not +3.

Inspecting the tz file:

$ zdump -v Africa/Johannesburg
Africa/Johannesburg  -9223372036854775808 = NULL
Africa/Johannesburg  -9223372036854689408 = NULL
Africa/Johannesburg  Sun Feb  7 22:07:59 1892 UT = Sun Feb  7 23:59:59 1892 
LMT isdst=0 gmtoff=6720
Africa/Johannesburg  Sun Feb  7 22:08:00 1892 UT = Sun Feb  7 23:38:00 1892 
SAST isdst=0 gmtoff=5400
Africa/Johannesburg  Sat Feb 28 22:29:59 1903 UT = Sat Feb 28 23:59:59 1903 
SAST isdst=0 gmtoff=5400
Africa/Johannesburg  Sat Feb 28 22:30:00 1903 UT = Sun Mar  1 00:30:00 1903 
SAST isdst=0 gmtoff=7200
Africa/Johannesburg  Sat Sep 19 23:59:59 1942 UT = Sun Sep 20 01:59:59 1942 
SAST isdst=0 gmtoff=7200
Africa/Johannesburg  Sun Sep 20 00:00:00 1942 UT = Sun Sep 20 03:00:00 1942 
SAST isdst=1 gmtoff=10800
Africa/Johannesburg  Sat Mar 20 22:59:59 1943 UT = Sun Mar 21 01:59:59 1943 
SAST isdst=1 gmtoff=10800
Africa/Johannesburg  Sat Mar 20 23:00:00 1943 UT = Sun Mar 21 01:00:00 1943 
SAST isdst=0 gmtoff=7200
Africa/Johannesburg  Sat Sep 18 23:59:59 1943 UT = Sun Sep 19 01:59:59 1943 
SAST isdst=0 gmtoff=7200
Africa/Johannesburg  Sun Sep 19 00:00:00 1943 UT = Sun Sep 19 03:00:00 1943 
SAST isdst=1 gmtoff=10800
Africa/Johannesburg  Sat Mar 18 22:59:59 1944 UT = Sun Mar 19 01:59:59 1944 
SAST isdst=1 gmtoff=10800

Africa/Johannesburg  Sat Mar 18 23:00:00 1944 UT = Sun Mar 19 01:00:00 1944 
SAST isdst=0 gmtoff=7200

Africa/Johannesburg  9223372036854689407 = NULL
Africa/Johannesburg  9223372036854775807 = NULL

7200 is 2 hours, so looks correct.


Maybe David Jarvie has a clue..


Regards,
Sérgio Martins
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