For the Edge Gateway, the time zone set in Installation & Maintenance will be applied to your reports. If the time zone is changed in Installation & Maintenance you will need to regenerate the report to apply the new time zone.
For the Cloud Connector, the time zone cannot be set in Installation & Maintenance. The standard time zone is used for these reports, which is (UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna.
The time zone applied to a report is shown in the Properties of the report.