Wrong Invoice Date is returned by API

We have an issue with the invoiceDate field of the list invoices endpoint.

The docs state:
invoiceDate := The date and time when invoice was issued.

Now, the original Invoice in Candis:

Candis parses the invoice date as 10.06.2025

According to the uploaded invoice.

BUT the API returns 09.06.2025 22:00:

... "invoiceId":"K125.0396.8503","invoiceDate":"2025-06-09T22:00:00.000+00:00","automaticPayment":true,"bankAccount": ...

which leads to missmatches in our application.

Using the the Candis API Reference direktly on the website results in the same:

Following the archival link I get to the correct invoice showing 10.06.2025 as invoice date.

Where is 22:00 comming from? Why isn't it the same date?
I can provide the support with the original Invoice.