Events showing incorrect time after DST changeover

[cas--]

I think I have found a bug with recurring meetings whereby events have started showing up with the incorrect time since the DST changeover. I am in the UK and the DST took place on Oct 30th. It might be related to the author of the calendar event being in Brasilia timezone where there is no DST changeover.

The meeting before DST changeover was at 16:15 on Monday's so should be now 15:15. However in the screenshot below you can see for next Monday it incorrectly shows two meetings one for 15:15 and one for 14:15 then for the following Mondays a single meeting at 14:15 (should be 15:15). If I try clicking on the 14:15 event nothing happens except an Event Not Found message popup.

For reference here are the correct events in Google calendar

I have exported the events and settings from the widget:

• Home-Todo-Agenda-Todo-Agenda-shareEvents-2021-11-04-18-17-28-843.json.txt

I have also exported the original event:

• vcal_export.ics.txt

[yvolk]

Hello @cas-- As our widget doesn't store events anywhere, but only shows what the Android system service "Calendar provider" returns to it, so I would say that this is events synchronization bug/defect.

Please look at the related issue #17

[cas--]

I did wonder if ToDo Agenda did any event conversion. Also useful to know for debugging that there is the Android calendar provider

ToDo Agenda uses "Calendar provider" Android service, working on this device whereas Google Calendar probably syncs with Google cloud directly. So different results are usually caused by Android "Calendar provider" sync problems, which may require user-forced re-syncing.

Anyway those events have been fixed by the event author updating to compensate for DST.

Thanks for keeping this super useful app updated 🎉

[yvolk]

I did wonder if ToDo Agenda did any event conversion

No time conversion is done for individual events. Actually date-time values come to our widget (according to the Android system-defined format) even without time zone as "the milliseconds from 1970-01-01T00:00:00Z"

We have "Lock time zone" feature for the whole widget instance though...

[cas--]

I just worked out the primary reason for the timezone issue relates to outdated Android 9 timezone data.

https://source.android.com/devices/tech/config/timezone-rules#timezone-apk

I have a Sony XZ1 Compact which hasn't received an update to the timezone since 2019 and these updates have to come from OEM! This means that when Brazil stopped using DST in 2019, therefore for several weeks my calendar will show the wrong timezone for any events using Brazil timezone until my timezone changes...

@yvolk How difficult would it be to include timezone data fallback in the widget? 🤪

My other option is to install Lineage OS and hope I can keep DRM keys for camera 🤔

[yvolk]

Hello @cas-- I think we simply need to update Time-related library in the widget itself. I will look into this.

[yvolk]

Hello @cas-- I updated Joda Time library, so hope that time zone information is updated there. Please check the updated ToDo Agenda v.4.5.1 here: #3