Emptying the DateTimePicker value?

Hi. I am having some problems with the DateTimePicker control. By default, the control would always have some invalid date values. I would like however to 'clear' it without displaying any date but only display it when user selected. I tried something like this but it doesn't work:

dtpDateOfBirth.Value = Nothing

I've got an System.ArgumentException and an error message like
Additional information: '1/1/0001 12:00:00 AM' is not a valid value for 'Value'. 'Value' should be between 'MinDate' and 'MaxDate'

Any help is greatly appreciated.

Archaven