Calendar items and Events now include support for specifying the Time Zone where the event is taking place. This Time Zone is used by the 'Add to Calendar' button displayed on the Calendar details, or the final Registration 'thank you' screen.
When an end user clicks the button, the start and end times are automatically adjusted for their local Time Zone when the item is added to their calendar.
If you leave the Time Zone field blank, the system uses your default setting. You can set the default Time Zone for your organization within the Administrator Settings. If the default setting has not been set, the system assumes the 'America/Detroit' (Eastern) Time Zone.