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When you schedule a webinar, GoToWebinar automatically applies the "Default timezone" currently selected in your account settings.
To change the timezone for an existing webinar, go to the My Webinars page and select the desired webinar. Then click Edit next to "Date and Time", and use the drop-down menu to change the timezone.
Be sure to enable the "Notify all participants of these changes" check box to alert your attendees to the change.