Greetings,
We have discovered a strange bug that exists on repeat views of the Month view calendar. If you view the Calendar below it will highlight the correct day. If you then completely close your browser, open it back up and visit the calendar again, it will jump back in time to highlight two days ago:
https://seabreeze.com/hours/
We were able to repeat this across IE11, Edge, Chrome, and Firefox, on multiple PCs and Macs. See attached screenshot wrongly displaying the 22nd as today (the 24th) on a repeat view of the Calendar (having closed Chrome down and relaunched it to view Calendar again).
Events Calendar 4.4.5
Events Calendar Pro 4.4.6
WordPress version 4.7.4