Indicates a reference timezone for the event start and end times. If physical event, you could use the timezone of the event location. If virtual event, the timezone of the event organizer.
Indicates the reference timezone offset with respect to UTC timezone a the time of event creation. The difference in minutes between the reference timezone time and UTC time (e.g. UTC+2 would be -120, UTC-5 would be 300, UTC would be 0).
An object intended to help with future events scheduling adjustments.