[Tickets #12773] Thunderbird lightning caldav serial event time failure with summer/wintertime change

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Ticket URL: http://bugs.horde.org/ticket/12773
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  Ticket             | 12773
  Created By         | rs at sys4.de
  Summary            | Thunderbird lightning caldav serial event time failure
                     | with summer/wintertime change
  Queue              | Kronolith
  Version            | 4.1.3
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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rs at sys4.de (2013-10-17 11:45) wrote:

Create a i.e weekly serial event with thunderbird 24 lightning sync it  
via caldav, the event ist shown with right start and end times in the  
present  in lightning, but in the future ( after time change ) it  
shows timeshit from one hour. Kronolith and Android shows right times  
ever.

here is some additional info with pics

http://sys4.de/de/blog/2013/10/17/serielle-kalender-termine-mit-thunderbird-24-lightning-und-horde-kronolith-caldav-bei-somm-winter-zeit-umstellung/

here is lightning bug report with some more information, guessing  
lightning bug

https://bugzilla.mozilla.org/show_bug.cgi?id=563314

now here is my debug from thunderbird console, what going on at caldav sync

upload

DTSTART:19701025T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CREATED:20131017T111708Z
LAST-MODIFIED:20131017T111748Z
DTSTAMP:20131017T111748Z
UID:6824a851-a5c8-4b1c-aa66-5da72756d071
SUMMARY:Mo-14-15
RRULE:FREQ=WEEKLY
DTSTART;TZID=Europe/Berlin:20131021T140000
DTEND;TZID=Europe/Berlin:20131021T150000
DESCRIPTION:Mo-14-15
END:VEVENT
END:VCALENDAR
CalDAV: recv:
CalDAV: Item added to robert at schetterer.org successfully

download sync from server

VERSION:2.0
X-WR-CALNAME:Kalender von robert at schetterer.org
PRODID:-//The Horde Project//Horde iCalendar Library//EN
BEGIN:VEVENT
DTSTART:20131021T120000Z
DTEND:20131021T130000Z
DTSTAMP:20131017T111749Z
UID:6824a851-a5c8-4b1c-aa66-5da72756d071
CREATED:20131017T111748Z
LAST-MODIFIED:20131017T111748Z
SUMMARY:Mo-14-15
DESCRIPTION:Mo-14-15
CLASS:PUBLIC
STATUS:CONFIRMED
TRANSP:OPAQUE
RRULE:FREQ=WEEKLY;INTERVAL=1;BYDAY=MO
END:VEVENT
END:VCALENDAR

as thunderbird lightning uploads with

DTSTART;TZID=Europe/Berlin...

in Kronolith sql Europe/Berlin is included for this event

i guess it need this too, when resync from the server
however it might be a lightning bug