I am experiencing a similar issue.
I am in the UK with timezone GMT.
I have a recurring all day event that occurs weekly every Wednesday and Saturday. I wish to exclude Wednesday 28th March. In order to do this I am having to add the exclude date 27th March.
Please can you advise how to resove this. N.B. this isn’t really a valid workaround as the event detail page shows the ecluded dates which are now showing the incorrect date.
Thanks, for you help and this great plugin.