Hi Travis:
I came here looking for a solution to the exact same issue. After finding nothing I goofed around in WP for a while and I hope your fix is as simple as mine was!
What solved it for me was going into WordPress General Settings (Settings -> General) and setting the site timezone to my local time rather than the default UTC. After that, I cleared the cache on my calendar(s) and that fixed the issue for me.
Hello,
First off, I apologize for the delay.
Glad you were able to find the solution!
For future reference you can visit our docs site also: https://docs.simplecalendar.io/
This particular issue is outline here: https://docs.simplecalendar.io/timezone-settings/