Error 1
Create a new event with "allDay" Option set:
from 20.01.2021 to 20.01.2021
does send to the server
{"changed":[],"added":[{"Subject":"Test1","StartTime":"2021-01-19T23:00:00.000Z","EndTime":"2021-01-20T23:00:00.000Z","IsAllDay":true,"StartTimezone":null,"EndTimezone":null,"resourceid":[11,2],"RecurrenceRule":null,"Id":"8820e487-3deb-9acc-2a9b-689c0c0a8e72"}],"deleted":[],"action":"batch",
so this events now spans two days rather than one
Updating the above created event to a single day event in setting the start day to 20.01.2021 changes the end date automatically to 21.01.2021 at the request
Updating the above created event to a single day event in setting the end day to 20.01.2021 changes the start day automatically to 19.01.2021 at the request
Error 2
Create new event with "allDay" Option set:
from 20.01.2021 to 21.02.2021
does send to the server
{"changed":[],"added":[{"Subject":"Test1","StartTime":"2021-01-19T23:00:00.000Z","EndTime":"2021-01-21T23:00:00.000Z","IsAllDay":true,"StartTimezone":null,"EndTimezone":null,"resourceid":[11,2],"RecurrenceRule":null,"Id":"fa151cbc-8b7a-94cc-2978-2297af9b8f51"}],"deleted":[],"action":"batch",