rangevalidator date problem

[Arpicheck]

Hi,

I am writing a page that contains a texbox, a calendar, and a
rangevalidator. The range validator is testing the textbox for date values.
There is an event, set up to fire, when the calendar's date has been changed,
and in the event body, i am using the calendar's function to transform the
date to string.

gasday.Text = Calendar1.SelectedDate.ToShortDateString();

In the page header, there is a culture setting:
<%@ Page Culture="hu-HU" Lang.....

My problem is, that if i click the calendar, the selected date is appearing
in the textbox, but the range validator is showing it's error message,
becouse the date is not in the right format.

Examples of dates:
date produced by the calendar: "2005.05.13." (this is the good date in
hungarian spelling)
correct date: "2005.05.13" (that's ok for the rangevalidator control)

It looks like the control's validation is'nt following the culture setting
in the header.

What do i wrong?

Thanks,
Arpicheck