If you are a workspace Admins you can change the default timezone. To do that:
Click on settings, it is the icon that appears in the upper right corner, next to your initials.
2. Click on 'My Workspace' on the menu at the top, then click on the dropdown arrow to the left of 'Update Workspace Settings'.
3. Choose the timezone from the list, then click 'Update'.
Note: Only workspace Admins and Owners are allowed to change the Timezone.