Hello! In the App Store Connect API there is no way to upload data in the UTC time zone, it is only available in the PST. Meanwhile, in the web account it is possible to change the time zone, this leads to the impossibility of compiling analytics This API endpoint https://api.appstoreconnect.apple.com/v1/salesReports
Can't Change timezone in API App Store Connect
As far as I know, unfortunately there's no way to change the timezone settings on the API itself