Crystal Reports NET - change culture

My application references Crystal Reports DLLs and uses them to generate reports (Using CrystalDecisions.CrystalReports.Engine.ReportDocument).

I need to customize the way Crystal outputs dates and numbers.

First I tried to set Culture on the thread that uses ReportDocument and calls its ExportToDisk method.

(Thread.CurrentThread.CurrentCulture and Thread.CurrentThread.CurrentUICulture)

Then I tried setting the default culture for my application

(CultureInfo.DefaultThreadCurrentCulture andCultureInfo.DefaultThreadCurrentUICulture).

Neither of these helps.

Is there any way to change Culture under which Crystal generates report?

Thanks