Lightning ignores timezone while updating existing event

[Gustavo Luiz Duarte]

How to reproduce:
1. I setup my timezone to UTC-3.
2. I received an event invitation for 9h UTC-5.
3. I accepted the invitation and it was added to Lightning correctly at 11h.
4. I received an update to the existing event changing the day of the week (it is an weekly event) and the time to 14h UTC-5.
5. I clicked on Update and the event was updated on Lightning to the correct day of week and wrong time: 14h.
As my timezone is set to UTC-3 the event should be scheduled to 16h.

System info:
ii xul-ext-calendar-timezones 1.0~b2+build2+nobinonly-0ubuntu2
ii xul-ext-gdata-provider 1.0~b2+build2+nobinonly-0ubuntu2
ii xul-ext-lightning 1.0~b2+build2+nobinonly-0ubuntu2
ii thunderbird 3.1.12+build1+nobinonly-0ubuntu0.11.04.1
Ubuntu 11.04

Please let me know if you need any further information.

[Gustavo Luiz Duarte (gustavold)]

Trying to investigate this I found the following:

The event update has a bunch of recurrence entries instead of a single WEEKLY one (as the original invitation).
I parsed the ics file using python vobject library. Here is the recurrence part:

>>> pp.pprint(parsedCal.contents['vevent'][0].contents['rdate'][0].value[0:3])
[(datetime.datetime(2011, 8, 23, 14, 0, tzinfo=<tzicalvtz 'Central'>),
  datetime.datetime(2011, 8, 23, 15, 0, tzinfo=<tzicalvtz 'Central'>)),
 (datetime.datetime(2011, 8, 30, 14, 0, tzinfo=<tzicalvtz 'Central'>),
  datetime.datetime(2011, 8, 30, 15, 0, tzinfo=<tzicalvtz 'Central'>)),
 (datetime.datetime(2011, 9, 6, 14, 0, tzinfo=<tzicalvtz 'Central'>),
  datetime.datetime(2011, 9, 6, 15, 0, tzinfo=<tzicalvtz 'Central'>))]

Here is the recurrence information stored on local.sqlite3 after I accept the original invitation:
sqlite> select * from cal_recurrence where item_id='C32C061093D2B0B5852578ED00508018-Lotus_Notes_Generated';
C32C061093D2B0B5852578ED00508018-Lotus_Notes_Generated|WEEKLY|0|0||1323975600000000||1||||5||||||6351966f-d163-4cf6-8b50-3fd3ec699e23

After I accept the event update this is what I get using the same query:
sqlite> select * from cal_recurrence where item_id='C32C061093D2B0B5852578ED00508018-Lotus_Notes_Generated';
C32C061093D2B0B5852578ED00508018-Lotus_Notes_Generated|x-date|0|0|LT1314108000000000|||||||||||||6351966f-d163-4cf6-8b50-3fd3ec699e23
C32C061093D2B0B5852578ED00508018-Lotus_Notes_Generated|x-date|1|0|LT1314712800000000|||||||||||||6351966f-d163-4cf6-8b50-3fd3ec699e23
C32C061093D2B0B5852578ED00508018-Lotus_Notes_Generated|x-date|2|0|LT1315317600000000|||||||||||||6351966f-d163-4cf6-8b50-3fd3ec699e23
...

I could not find exactly what the prefix LT means.
From the link bellow it seems it is floating time:
http://mxr.mozilla.org/mozilla/source/calendar/providers/storage/calStorageCalendar.js#153

Interpreting the recurrences as UTC they are scheduled to 14:00
$ date -u -d @1314108000
Tue Aug 23 14:00:00 UTC 2011

Interpreting it as UTC-03 (my local timezone) it is scheduled to 11:00
$ date -d @1314108000
Tue Aug 23 11:00:00 BRT 2011

Observations:
1. It should not be stored as floating time since the ics file provides timezone information.
2. The event is scheduled for 14:00 UTC-05 and stored as 14:00 floating even if I'm in a different timezone.
3. Although the event recurrence is stored as floating time, Lightning seems to be interpreting it as UTC time, because, as I'm at UTC-03, the event is shown in Lightning starting at 11:00.

[gf (gf-interlinks-deactivatedaccount)]

Hello Gustavo,
Thank you for submitting this bug and reporting a problem with Thunderbird/Lightning.

You made this bug report in 2011 and there have been several versions of Ubuntu and Thunderbird since then.

Could you confirm that this is no longer a problem and that we can close the ticket?
Or, if it is still a problem, could you run the following (only once):
apport-collect 837598

and upload the updated logs and and any other logs that are relevant for this particular issue.

Thank you again for helping make Ubuntu and Thunderbird/Lightning better.

G

[Launchpad Janitor (janitor)]

[Expired for lightning-extension (Ubuntu) because there has been no activity for 60 days.]