Where does Meeting Scheduler pull the default timezone from?

Meeting Scheduler determines the default based on the timezone that the web browser reports, which is most often derived from the timezone of the device. 

What if the default timezone is incorrect? 

Simply correct the timezone in either the device or browser, and return to your Meeting settings. Scroll to the availability settings, and you should see two time zones listed (the current setting and the new browser setting). Select the correct timezone and hit Save to update your Meeting Scheduler.