We encountered a bug with the display of an event on the wrong day.
First, you need to be in a week view where the first day of the week is a timezone change, like last sunday. After, you create an event that start between 11pm and 12pm on that week.
Your event should be displayed on the next day. You can also see this behavior when you try to drag an event and the start time of your event pass 11pm.
The function _get_event_sday is calculating the wrong column because of the timezone change between the _min_date and start_date
Is the above event was created through scheduler’s UI or created on server side and just shown at scheduler ? In second case - please check the data how it shown in data xml | json - is it valid or already wrong there.