The view of campaign schedules you see on the campaign screen shows the time these are scheduled to go out in. This is displayed in the same timezone the admin user account has configured.
Eg. If you admin user is set to CST and you schedule a campaign to go out at 8:00 AM PST the campaign schedule will say 10:00 AM CDT
To see what timezone your admin user view is set to by clicking on the circle in the top right corner of the portal.
If you need to change you timezone view go to Settings > Admin Users change the timezone for the admin and select update at the bottom of the screen the new timezone should update in 15 minutes.