Calendar Sync Timezone issue
haffmans opened this issue · comments
I use SpaceLaunchNow on Android 8 and sync events to a calendar. This calendar is synced by DavDroid to my CalDav server (Kolab-based). On all other devices, the times are shifted by the UTC offset of the time zone I live in (CEST - so that's UTC+2 at the moment).
Using iCal Import/Export 3.2 on Android to extract an ICS file of the calendar on the originating device, I get this event as an example:
BEGIN:VEVENT
DTSTART:20180909T032800Z
TRANSP:OPAQUE
DTEND;TZID=Europe/Amsterdam:20180909T092800
ORGANIZER:redacted@example.com
SUMMARY:Falcon 9 Block 5 | Telstar 18 VANTAGE
DESCRIPTION:Telstar 18 VANTAGE\, or Telstar 18V\, is a communications satellite built by Space Systems Loral for the canadian satellite operator Telesat. The satellite is to be provide coverage to the Asia Pacific region.\n\nWatch Live:\nhttp://www.spacex.com/webcast\n\n via Space Launch Now
LOCATION:Cape Canaveral\, FL\, USA
STATUS:TENTATIVE
DTSTAMP:20180904T200627Z
UID:2ac7209c-1d81-432e-bd8a-6182590de72e
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-PT30M
DESCRIPTION:
END:VALARM
END:VEVENT
What's noticable is the difference in timezone for the DTSTART and DTEND fields. It's possible the server misinterprets this difference due to a bug on their end, but the resulting event on the server:
- Has DTSTART converted to Europe/Amsterdam timezone (adds +2 hours), but stores that time as UTC (ends up as
DTSTART:20180909T052800Z) - Leaves the DTEND time as-is but interprets (and stores) it as UTC (
DTEND:20180909T092800Z)
This calendar is the only one where I'm having this issue with; all other calendars which I have are synced consistently and don't break like this, regardless of the time zone of the events (but start and end are always in the same time zone).
I'll look into this but I can't make any promises - just as a note there may be a better way to export the Launch calendar if your purpose is to import into a different calendar system.
Closing this issue as wont fix for now.