What Timezone is the Shift Scheduled in?

Opportunites will display the Timezone that they are occurring on the Public Page. To check what Timezone the Shifts are scheduled in you can go to the Public Page and look at the Opportunity details on the left-hand side of the page. 

If your Manager has set it so Users can select their own shifts, you will also see the timezone the shifts are scheduled in at the top of the shift selection page.