Viewers will see different times displayed, depending on their location, profile settings, VPN usage and other factors.
If you are not logged in, the time displayed will be based on your geolocation.
If they are logged into your account, you will see the timezone that you have registered on your profile.
Being logged into your account, the webinar shows the timezone saved on your account:
Being logged out of your account, the timezone displayed will be set by the geo IP (physical location):