The organization default time zone will be used to set the default time zone for every new dashboard, Explore mode, and report dates.
From the top navigation, select the ellipsis menu and choose Settings. Under the Organization tab, you’ll see a dropdown labeled Time Zone. From this dropdown, select a time zone option and click “Update” to save and apply the changes.
Note: If you change the organization default Time Zone, any dashboards currently using the default Time Zone will update to use the new default.