[korganizer] [Bug 434599] New: Exceptions to recurrence with timezones do not generate TZ-relative datetime

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=434599

            Bug ID: 434599
           Summary: Exceptions to recurrence with timezones do not
                    generate TZ-relative datetime
           Product: korganizer
           Version: 5.16.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: recurrence
          Assignee: kdepim-bugs at kde.org
          Reporter: wjb at williamjbowman.com
  Target Milestone: ---

Created attachment 136832
  --> https://bugs.kde.org/attachment.cgi?id=136832&action=edit
An export of the invalid iCal file, whose EXDATE seems invalid

SUMMARY

When deleting a single occurrence of a recurring event with a timezone, thus
creating an exception to a recurrence, Korganizer assigns an EXDATE using VALUE
instead of TZID, apparently violating the CalDAV spec.

Some CalDAV servers reject the change. Unfortunately, the change is cached
locally, so we get an inconsistent view of the calendar---other clients don't
show the change.


STEPS TO REPRODUCE
1. Create a recurring event with a specific timezone, such as
American/Vancouver.
2. Delete 1 occurrence of the event, creating an exception.
3. Export the event to an iCal file.

OBSERVED RESULT
On the server:
```
WARNING: Bad PUT request on
'/CA4413E8-13F2-465C-B1BA-EF2420F9DDFA/1616109800.R60.ics': Failed to store
item '1616109800.R60.ics' in collection
'/CA4413E8-13F2-465C-B1BA-EF2420F9DDFA': can't compare offset-naive and
offset-aware datetimes
```

In the iCal file, the exception will appear as:
```
EXDATE;VALUE=DATE:20210317
DTSTART;TZID=America/Vancouver:20210315T190000
DTEND;TZID=America/Vancouver:20210315T200000
```

EXPECTED RESULT

In the iCal file, the exception should appear as:
```
EXDATE;TZID=America/Vancouver:20210317T190000
DTSTART;TZID=America/Vancouver:20210315T190000
DTEND;TZID=America/Vancouver:20210315T200000
```

SOFTWARE/OS VERSIONS:
Linux 5.10.15-1-MANJARO 64bit
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.78.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

The spec suggests that if the RSTART is a TZID, the EXDATE should be too:
https://tools.ietf.org/html/rfc5545#section-3.2.19

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