Lightning does not display and mixes up time zones

[Karl Kastner]

I send a meeting invitation with Thunderbird/Lightning over a gmail address. The meeting was scheduled 10am and so it appears for me in my calendar. However, all guests see the invitation as 1pm. The time zone on my local machine as well on google calendar is Berlin GMT+2. The time zone off all guests is also GMT+2. This only occurs to send invitations, invitations that I receive are added to my calendar with the correct time and not with an offset of 3 hours.

I noticed that the field Thunderbird as Edit -> Preferences -> Calendar -> Timezone was empty. Once I set it to GMT+2 and restarted Thunderbird ivitations were send with the correct time.

Lightning should use the system time zone on default and display the time zone when scheduling the meeting, as well as in invitations to avoid confusion.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xul-ext-lightning 1:52.1.1+build1-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-78.99-generic 4.4.62
Uname: Linux 4.4.0-78-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: pia 2855 F.... pulseaudio
 /dev/snd/controlC1: pia 2855 F.... pulseaudio
BrokenPermissions:
 extensions/{1f38ac4f-07a2-4d70-92e8-3b9cb468cda5}/components/mozOutlookPstImport.js (0o400)
 extensions/{1f38ac4f-07a2-4d70-92e8-3b9cb468cda5}/install.rdf (0o400)
 extensions/{1f38ac4f-07a2-4d70-92e8-3b9cb468cda5}/platform/Linux_x86-gcc3/content/bin/readpst+ (0o400)
 extensions/{1f38ac4f-07a2-4d70-92e8-3b9cb468cda5}/platform/WINNT_x86-msvc/content/bin/readpst+.exe (0o400)
BuildID: 20170510141111
Channel: Unavailable
CurrentDesktop: GNOME
Date: Mon Jun 19 10:50:05 2017
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2015-11-05 (591 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
IpRoute:
 default via 172.18.63.254 dev wlan0 proto static metric 600
 10.91.7.10 via 172.18.63.254 dev wlan0 proto dhcp metric 600
 169.254.0.0/16 dev wlan0 scope link metric 1000
 172.18.32.0/19 dev wlan0 proto kernel scope link src 172.18.36.194 metric 600
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-4ce952b9-f3ea-4fa1-9dab-969092170331
Plugins: Shockwave Flash - /usr/lib/gnash/libgnashplugin.so (browser-plugin-gnash)
PrefErrors: 'utf-8' codec can't decode byte 0xe4 in position 928: invalid continuation byte
PrefSources:
 [Profile]/extensions/{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}/defaults/preferences/preferences.js
 [Profile]/<email address hidden>/defaults/preferences/preferences.js
 [Profile]/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/defaults/preferences/lightning.js
Profiles: Profile0 (Default) - LastVersion=52.1.1/20170510141111
RelatedPackageVersions: browser-plugin-gnash 0.8.11~git20160109-1build1
RunningIncompatibleAddons: False
SourcePackage: thunderbird
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: W230SS
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/15/2014:svnNotebook:pnW230SS:pvrNotApplicable:rvnNotebook:rnW230SS:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
dmi.product.name: W230SS
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.