All Day entites span two days

I am also seeing this.

My guess is that it is something to do with the timezone but I haven't been able to debug it yet.

I also have Smart Date installed and when I use the "Time zone override" set to UTC the event shows up correctly (only on a single day) except now it shows:

7:00 - 6:59am (all day)

overriding the timezone on the date field in the calendar view to UTC does not fix the issue for me.

It happens because it renders dates in different time zones
I have UTC for one field and (America/Toronto) fro another

Related to current issue - https://www.drupal.org/project/calendar_view/issues/3405794 🐛 All-day dates start early Fixed
I reverted the changed in the merge request because it is not working if we have on standard timezone in the site and not correct data range.

@foxy-vikvik your patch does not fix the issue is what you're saying?

I think what @foxy-vikvik is saying is that the fix for issue 3405794 🐛 All-day dates start early Fixed causes another problem. His patch reverts the change implemented for the previous issue, which corrects this issue.