Dateformat problem Reportviewer ?

Dateformat problem when doing Export (Report action) .pdf,multipage Image,spredsheet.
Get m/d/yyyy format. When using download action for .csv and Spreadsheet the Date format i correct as I want: Guess this have somthing with the Reportviewer to do - been using to much time, cant figure out the problem (Reportviewer versjon 10)

Thanks for any help I'm in trouble!
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