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Thanks for the feedback.
Do you mean you want to specify the time zone information for the start and end time of an appointment?
To do this in Outlook: In the home tab of Outlook client, click New Items, select Appointment, click on Time Zone icon in the ribbon, and you can specify the time zone information by clicking on the drop-down list besides the start time and end time.
If you have other questions, please feel free to post on the forum.
Any updates on this issue? Did my above information help you?