Having this issue with our company exchange email and samsung calendars. This post on google forums: https://support.google.com/calendar/thread/10005798?hl=en seems to have isolated the issue. Google calendar is having the same issue. I exported (ICS calendar file) an all day event that was appearing 1 day early from my samsung calendar and can confirm when opening it in a text editor, that the time zone is indeeed wrong. Exported a non-all-day event and it looked fine. So I believe this is the issue. They really need to get this fixed.
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