Incorrect value set to Events.EVENT_TIMEZONE (Android)

[kinex]

I have been investigating some timezone related issues and found this in the plugin code:
https://github.com/builttoroam/flutter_plugins/blob/develop/device_calendar/android/src/main/kotlin/com/builttoroam/devicecalendar/CalendarDelegate.kt#L390

I am quite sure displayName is not the correct value to put there, you should use ID instead (as told e.g. here).

So why does it seem to work then without issues? I think this is because the value (DateTime.millisecondsSinceEpoch) passed from Dart is UTC time. Setting invalid value to EVENT_TIMEZONE is probably ignored and actual timezone is reverted to UTC.

So I think it is also a bug even trying to put the current device timezone to EVENT_TIMEZONE, because the Event.start is UTC.

Fix options:

1. Save in EVENT_TIMEZONE the UTC timezone.
2. Convert Event start/end to local time and save in EVENT_TIMEZONE the device timezone.
3. Remove setting EVENT_TIMEZONE at all? Maybe the default is UTC? Should be tested.

Or have I misunderstood something?

[bhl09]

I haven't seen any issue with using displayName except it uses wrong (or null) timezone when you use your local calendar in Samsung phones. Just tried out with using id and it seems to be working.
Thanks for the point and I'll put this in so it's available in the next release.

[bhl09]

All TimeZone variables are now using id in v3.1.0, closing this ticket.