Parameter Date Format problem

[RodFoulcher]

Have created a report with two parameters in VS. In Preview my input dates are accepted as dd/MM/yyyy. In SSRS my input dates are also accepted as dd/MM/yyyy.

Have found that it does not seem to matter whether I use either of the following, Both seem to work much the same:

public ActionResult MatchDrawReport()
{
var model = this.GetReportViewerModel(Request);
model.ReportPath = "/Reports/MatchDrawReport";

    return View("ReportViewer", model);
    }

OR
public ActionResult MatchDrawReport(string namedCalendarDate, string namedRound)
{
var model = this.GetReportViewerModel(Request);
model.ReportPath = "/Reports/MatchDrawReport";
model.AddParameter("CalendarDate", CalendarDate);
model.AddParameter("Round", Round);
return View("ReportViewer", model);
}

In Report Viewer for either of above this format is invalid and throws an error (check parameter).
It will only accept an input of MM/dd/yyyy (which will be very annoying to users).

Have tried DateTime instead of string and .ToString(dd/MM/yyyy) but this gives an error on execution.

Is there a way around this problem please?

I note issue 44 is also about the same thing but that was a year and a half ago. The comment then was ... I saw that you have put "en-us" in your reporthelpers.cs file so I thought there may be a solution via your Report Viewer.

Suspect the "en-us" is the problem.

[RodFoulcher]

Have waited patiently for 5 months - not even a comment.
Hard to believe no one has a work around for the above date format problem.