Dynamic Range Validation in ASP.NET MVC 2

I am using ASP.NET MVC2 and trying to validate my view models using the attributes in System.ComponentModel.DataAnnotations namespace.

How can I dynamically set the permitted valid range of a RangeAttribute? For example, if I want to validate that a date entered is within an expected range.

This doesn't compile:

[Range(typeof(DateTime), 
        DateTime.Today.ToShortDateString(), 
        DateTime.Today.AddYears(1).ToShortDateString())]
    public DateTime DeliveryDate { get; set; }

because "an attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type".

Do I need to resort to creating my own custom validator?