I will confirm if Calendar update events for edited submissions?

If there is a change in the event and subsequently submitted a form with the change, then the even change will be reflected in the Google calendar? i.e)delete old event/ create new event, change the event time

We are currently experiencing a problem with Google Calendar, but like most integrations in our form builder, I think edits will be made available to the linked calendar. I will try this again later once the issue is resolved, and I'll post an update here. 

Thank you for waiting. We've just fixed the integration. Please check now. 

As for editing submission or event, I figured out it is keeping the event on the previous date that is selected by the submitter and adds a new one for the newly selected date.