Members of all levels are able to edit their time zone settings.
Here is a step-by-step process of this action:
Step 1. When logged into your portal, go to the drop-down menu that is present in the top menu bar next to your name. Navigate to Personal Settings.
Step 2. Now when in your personal settings, go to the Region subheading. Within this you will see an area for Selecting Time Zones. (as shown in the image below)
Step 3. Choose the time zone that applies to you.