Hi Volker,
Greetings from Syncfusion support.
We would like to inform you that, we implemented the DateTimePicker control completely in server side. Now, there is no interaction between the client and server in the Blazor DateTimePicker. Basically, whenever a client and server interaction occurs, date changes will occur as the date is passed from client to server. We give the ServerTimezoneOffset property to avoid problems of this kind. But the problem is no longer going to occur in Blazor DateTimePicker. Therefore, the ServerTimezoneOffset property will not work here.
We have used this ServerTimeZoneOffset for internal purpose but unfortunately its exposed as public. We will deprecate this in upcoming release.
Regards,
Berly B.C