Kyle,
yes, timezones are identical on server and client (as reported earlier in this ticket).
I already tried deleting the calendardata.xml file (see earlier in the ticket) and starting from scratch...same problem.
And I also already created a ticket for this....way back in august 2017....which resulted in a lot of testing and reporting...but to no avail.
So now and again I try again after an SM update to see if anything has changed but I have been forced to go back to Google calendar because of the issues.
I really appreciate your help but asking me to try things which I have already tried and reported on in this ticket doesn't really help.
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