Created attachment 144051 [details]
Video of bug in Kalendar

SUMMARY
***
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Adding a new todo within a Google calendar has bugs regarding the due date.

When a new todo is created and it is set to have an all-day due date, when the collection refreshes the date will be rolled back to the previous day.

If one tries to edit the due date for a task, the edit will be reverted once the collection refreshes.

Can reproduce on both Kalendar and KOrganizer.

STEPS TO REPRODUCE
1. Create a new task within a Google Calendar
2. Assign a due date and save
3. Wait for the parent collection to refresh automatically or manually refresh and see the dates get rolled back to the previous day

or...

1. Edit a task's due date and save the changes
2. See the dates revert to their previous due dates upon refresh

OBSERVED RESULT

Todos' due dates change on calendar refresh.

EXPECTED RESULT

Todos' due dates should remain the same as the user has set them.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION

I have attached a video showing the issue.